Spiriverpa cinerascens (Cole)

cinerascens Cole (1923:97 orig. desc.; 1965:353 cat.) (Thereva); Irwin and Lyneborg (1981a:216 listing, comb. change) (Spiriverpa). Type locality Hood River, Oregon, USA. Holotype female in USNM.

Diagnosis. Like Spiriverpa bella and S. senex in having the male ommatidia of uniform size; halter knob pale yellow; inner gonocoxal setae yellow; ventral apodeme extending beyond anterior margin of dorsal apodeme (Fig. 31); female common duct longer than furca (Fig. 33); spermathecal ducts originating from posterolateral margins of spermathecal sac (Fig. 33). Spiriverpa cinerascens differs from Spiriverpa bella and S. senex in having the setae on the male and female frons dark reddish brown to black, extending ventrally onto the dorsal half of parafacial; and the gonostylus with basodorsal spines (Fig. 29).

Redescription of male.

Morphometric variation (n=10).

Body Length 7.7–11.5, 9.0 mm

Head. Length 1.10–1.24, 1.19 mm. Ommatidia of uniform size. Frons pruinescence reddish brown, ventral third silver; setae black. Antenna with scape and pedicel reddish brown, flagellum black, pruinescence gray, dense on scape; antenna/head length 0.78– 1.08, 0.87; scape length 0.34–0.54, 0.44 mm, length/width 2.1–3.1, 2.4, scape/pedicel length 3.4–5.5, 4.3, scape/flagellum width 0.9–1.4, 1.2, setae on scape dark reddish brown to black dorsally intermixed with white setae ventrally; pedicel length 0.08–0.12, 0.08 mm, length/width 0.6–0.9, 0.7; flagellum length 0.46–0.54, 0.49 mm, length/width 2.6– 3.6, 3.1, flagellum/scape length 1.0–1.5, 1.1. Parafacial setae white on ventral two–thirds black on dorsal third. Maxillary palpus pale yellow; length 0.42–0.72, 0.56 mm, length/ width 6.4–12.0, 8.7;setae white.

Thorax. Macrosetae 2–4 np, 1–2 sa, 1 pa, 1–2 dc, 2 sc. Mesonotum black, dull; vittae indistinct; setae white intermixed with black setae. Setae on postpronotal lobe white. Pleuron and scutellum pruinescence gray, dense; setae white. Wing. Length 6.7–8.8, 7.7 mm, length/width 2.9–3.5, 3.1; membrane hyaline, veins brown; pterostigma pale brown; cell m3 open. Halter knob pale yellow, stalk brown. Legs. Coxal setae white. Femora dark reddish brown, pruinescence gray, dense. Tibiae dark yellow, reddish brown apically. Tarsomere 1 dark yellow, darker apically, 2–5 reddish brown.

Abdomen. Cuticle reddish brown, pruinescence white; dorsal and lateral setae white. Terminalia. Reddish brown. Tergite 8 (Fig. 25), setae pale yellow, absent medially on posterior margin. Sternite 8 (Fig. 27) quadrate, sides rounded, setae pale yellow. Epandrium (Fig. 25) quadrate, posterior margin yellow, glabrous, posterolateral margin tapered to broad point; lateral view (Fig. 26) hemispherical, tapered posteriorly to ventral point. Gonocoxite ventral view (Fig. 27) quadrate, tapered posteriorly to thick point, setae pale yellow with scattered dark brown setae posteriorly; lateral view (Fig. 28) quadrate, posterior margin with short median and ventral point, inner gonocoxal process yellowish brown, elongate, clavate, extending beyond posterior margin of gonocoxite, apical setae pale yellow; ventral lobe (Fig. 27) with fine ventral setae. Gonostylus (Fig. 29) with patch of short basodorsal spines (seen with compound microscope). Aedeagus with ventral apodeme (Fig. 31) diverging anteriorly, anterior margin truncate, ending beyond anterior margin of dorsal apodeme; distiphallus lateral view (Fig. 32) projecting ventrally at 90° angle; ejaculatory apodeme (Fig. 30), in cross­section flattened dorsoventrally.

Redescription of female.

Similar to male except as follows. Morphometric variation (n=10).

Body length 8.0–9.9, 9.1 mm

Head. Length 1.00–1.24, 1.17 mm. Frons pruinescence pale brown, silver ventrally with narrow dark brown area dorsolaterally; setae dark reddish brown (female specimens from Idaho, MEI 125961, 125983 possess white setae lateral to antennal base). Antenna/ head length 0.82–0.91, 0.85; scape length 0.34–0.46, 0.41 mm, length/width 1.9–2.9, 2.3, scape/pedicel length 3.4–4.4, 3.9, scape/flagellum width 0.9–1.1, 1.0; pedicel length 0.10– 0.12, 0.11 mm, length/width 0.6–0.9, 0.7; flagellum length 0.44–0.52, 0.48 mm, length/ width 2.3–3.3, 2.7, flagellum/scape length 1.0–1.3, 1.2. Maxillary palpus length 0.54– 0.70, 0.61 mm, length/width 6.2–10.7, 9.8.

Thorax. Macrosetae 2–3 np, 1–2 sa, 1 pa, 1–2 dc, 2 sc. Dorsocentral vitta dark reddish brown, pruinescence gray with narrow median brown stripe; setae black intermixed with pale whitish yellow, subappressed setae. Postpronotal lobe and scutellum with pale whitish yellow setae. Wing. Length 5.3–8.4, 7.3 mm, length/width 3.1–4.5, 3.5; cell m3 closed at wing margin.

Abdomen. Pruinescence grayish brown, dense, tergites 2–7 with broad dark brown anterior fascia, extending posteromedially, becoming smaller on successive tergites; dorsal and lateral setae white, appressed, becoming black on posterior segments. Terminalia. Median lobe of tergite 9 dark brown, setae black. Furca (Fig. 33) oval, posterior margin truncate, length 0.62 mm, width 0.39 mm; common duct longer than furca; spermathecal ducts originates from posterolateral corners of spermathecal sac.

Biology. Spiriverpa cinerascens have been handnetted or collected in Malaise traps in a dry creek bed. Adults were collected between 4 January and 12 September.

Distribution. Spiriverpa cinerascens has been collected from California to British Columbia and east to Utah (Fig. 50).

Specimens Examined. Type specimens. The holotype female of Thereva cinerascens Cole (USNM Type Number 25936) was collected at "Hood River, Ore. VI–13–17, F R Cole coll." Other Specimens. CANADA. BRITISH COLUMBIA. Revelstoke [50.997, ­ 118.198], 5.VIII.1982, Videk, C., Videk, A. V., 1 female MEI 136225 (ZMAN); Courtenay, Udina Bay [49.69, ­124.993], 1.VIII.1988, S. G. Cannings, 2 males MEI 0 13131, 0 13141 (SMDV), Malaise trap; 2.VIII.1988, 3 males MEI 075848­9, 0 13139 (SMDV); 3.VIII.1988, 2 females MEI 0 13132, 0 13138 (SMDV); 4.VIII.1988, 1 female MEI 0 13134 (SMDV); 6.VIII.1988, 1 female MEI 0 13136 (SMDV); Duncan [48.783, ­123.7], 8.IV.1923, W. B. Anderson, 1 female MEI 125975 (CNC); Hope, Nicolum River [49.383, ­121], 13.VII.1906, R. V. Harvey, 1 female OSUC 0 0 11223 (OSU); Langford [48.45, ­ 123.5], 20.VIII.1964, D. Evans, 1 female MEI 125976 (CNC); Lillooet River, Mount Currie [50.25, ­122.783], S. G. Cannings, 1 male MEI 0 75855 (INHS); Quesenel [52.983, ­ 122.496], 3.VII.1949, G. J. Spencer, 1 female MEI 0 13158 (INHS); Robson [49.333, ­ 117.683], 15.VI.1957, H. R. Foxlee, 1 female MEI 0 13085 (SMDV); Shuswap Lake Narrows [50.933, ­119.283], 9.VIII.1942, G. J. Spencer, 1 female MEI 0 13089 (SMDV); Vancouver [49.25, ­123.117], 1.VII.1930, H. B. Leech, 1 female MEI 0 13093 (SMDV); 10.VII.1930, H. B. Leech, 2 females MEI 0 13124, 0 13127 (SMDV). UNITED STATES. CALIFORNIA. Humboldt County: 3 km NE Orleans [41.321, ­123.521], 9–VI.1984, Danielson, R., 1 male MEI 134432 (MZLU). Marin County: Muir Woods National Monument [37.896, ­122.579], 21.VI.1947, Melander, A. L., 1 male, MEI 0 0 7380 (USNM); Arroyo Sausal, W of Point Reyes, Petaluma Road, Hicks Valley [38.146, ­122.711], 115 m, 14.VI.1980, P. H. Arnaud, Jr., 1 female MEI 126042 (CAS). Napa County: 12 km N Calistoga, along Highway 29 [38.681, ­122.592], 475–550 m, 11.VI.1988, P. H. Arnaud, Jr., 1 female MEI 126041 (CAS). Nevada County: Truckee [39.328, ­120.182], 14.VI.1927, E. P. Van Duzee, 1 female MEI 126037 (CAS); 18.VI.1927, 1 female MEI 126036 (CAS). San Mateo County: Jasper Ridge Biological Preserve, Stanford University [37.408, ­122.226], 30.VIII.1987, P. H. Arnaud, Jr., 1 male MEI 126046, 2 females 126043­4 (CAS), Malaise trap in dry creek bed; La Honda [37.319, ­122.273], 134 m, 31.VII.1968, P. H. Arnaud, Jr., 1 female MEI 126039 (CAS); San Mateo County Memorial Park [37.277, ­122.293], 60 m, 12.VIII.1959, P. H. Arnaud, Jr., 1 female MEI 126040 (CAS); 12.IX.1965, P. H. Arnaud, Jr., 1 male MEI 126047, 1 female 126045 (CAS). Santa Clara County: Smith Creek Ranger Station [37.323, ­121.668], 640 m, 20–21.VII.1968, P. H. Arnaud, Jr., 1 female MEI 126038 (CAS). IDAHO. Latah County: Moscow Mountain [46.804, ­116.868], date?, F. M. Hull, 2 females MEI 125961, 125983 (CNC). ORE­ GON. Benton County: Corvallis [44.565, ­123.261], – VIII.1897, 1 male MEI 133528 (OSU). Coos County: 8.1 km NE Coquille, Fairview [43.217, ­124.072], 5.I.1960, J. Rogers, 1 male MEI 133525 (OSU). Curry County: Harbor, Chetco River [42.055, ­124.269], 6.VII.1969, R. L. Westcott, 1 female MEI 0 0 7705 (ODAC). Hood River County: Hood River [45.711, ­121.515], 13.VI.1917, F. R. Cole, 1 female MEI 0 0 9224 (EMEC). Lane County: Springfield [44.046, ­123.021], –. VII.1931, 1 male MEI 133532 (INHS). Marion County: Jefferson [44.72, ­123.009], 12.VI.1951, V. Roth, 1 female MEI 133535 (INHS). Multnomah County: Sandy River, Base Line and Highway 30 [45.568, ­122.4], 1.VII.1942, G. Ferguson, 1 male MEI 133531 (OSU). UTAH. Cache County: 26.6 km NE Logan, Logan Canyon, Tony Grove [41.872, ­111.603], 4.VII.1998, Webb, D. W., Webb, L. G., 1 female MEI 136358 (INHS). WASHINGTON. King County: Seattle [47.606, ­ 122.331], 1 male MEI 133530 (OSU); 10.VI.1931, 1 male MEI 133527 (OSU); 13.VIII.1966, D. Frechin, 1 female MEI 0 0 9379 (WSU). Klickitat County: 4.8 km NE Goldendale, Little Klickitat River [45.862, ­120.763], 21–22.VI.1969, E. M. Fisher, 1 male MEI 0 12921 (UCR). Pacific County: Bay Center [46.632, ­123.954], 28.VII.1935, 1 male MEI 133529 (INHS); Ocean Park [46.496, ­124.056], 13.VII.1954, M. T. James, 1 male MEI 125562 (WSU); 29.VII.1959, M. T. James, 1 female MEI 125561 (WSU); Seaview [46.333, ­124.054], 26.VI.1925, Spuler, A., 1 female MEI 0 71004 (EMUS). Pierce County: Elbe [46.765, ­122.193], 17.VII.1941, 1 male MEI 125987 (LACM); Mount Rainier National Park, Carbon River, near Ranger Station [46.853, ­121.761], 15.VIII.1999, B. Kondratieff, 1 female MEI 116999 (CSUC); Mount Rainier, White River Camp [46.853, ­121.761], 31.VII.1932, J. Wilcox, 1 female MEI 133537 (OSU); Mount Rainier National Park, 17.2 km SE Wilkeson, 1.9 km E Carbon River Entrance [46.995, ­ 121.897], 591 m 18.VII.1995, Lisowski, E. A., 1 female MEI 136855 (INHS); Spanaway [47.11, ­122.43], 22.VII.1930, W. W. Baker, 1 male MEI 133524 (OSU); Sumner [47.203, ­122.239, 6.VI.1932], 1 male MEI 133533 (OSU); 17.VI.1932, C. H. Martin, 1 male MEI 133523, 1 female 0 12804 (MEI); 28.VI.1932, J. Wilcox, 1 female MEI 133536 (INHS); 21.VII.1933, C. H. Martin, 1 female MEI 0 12803 (OSU). Whatcom County: Bellingham [48.755, ­122.483], 13.VII.1924, J. F. Clarke, 1 female MEI 112707 (USNM).