Nothybus triguttatus Bezzi

Nothybus triguttatus Bezzi

Figures 64–66, 76, 121–126

Nothybus triguttatus Bezzi 1916: 55. Enderlein 1922: 176 [genus review]; Aczél 1955: 9 [family revision, key]; Frey 1958: 39 [Philippines]; Delfinado 1969: 168 [type data, lectotype designation]; Steyskal 1977: 31 [Oriental catalogue].

Description. Head: Yellow with orange tint. Distal 2/3 of first flagellomere dark brown. Velvety anterolateral patches on frons confluent with anterior margin and dark parafacial, posteromedial patch notched posteromedially; back of head otherwise yellow with transverse band of whitish pruinescence above foramen. Ocellar tubercle dark brown. Ventral half of face white tomentose excluding medial ovate glabrous spot that may be yellow, orange or brownish. Parafacial dark velvety brown excluding inner-dorsal margin.

Thorax: Yellowish-orange in base colour. Postpronotum light yellowish; scutum sometimes appearing to be slightly deeper yellow, uncommonly with one pair of small brownish anterolateral spots presuturally. Katatergite, anatergite, anepimeron and posterodorsal margin of katepisternum light yellow. Subscutellum relatively large, swollen. Six to 8 irregular rows of presutural acrostichal setulae in medial patch; lateral patch of 3 additional rows of setulae not well delimited by gap.

Wing: (Fig. 76) Wing length 6.2–7.3mm. With narrow transverse stripe tapering to CuA1 and faded at costa; apical region of cell r1 mostly clear. Region distal to transverse band slightly dusky, with margin only slightly darker; with 3 clear subapical spots with second spot displaced apically. Base of R4+5 with 2 setulae ventrally.

Legs: Yellowish-orange with tibiae dark brown excluding pale base, and tarsi dark brown excluding white fore basitarsomere with small dark brown basoventral spot.

Abdomen: Yellowish-orange; female sometimes with small brown posteromedial margin on tergites 2–4.

Male terminalia: (Figs 121–126) Sternite 6 with anterior margin half width of posterior margin. Sternite 7 not evident in dissected male. Sternite 8 broad, dome-like, setose along posterolateral margin. Epandrium broad, setose, fused to posterior half of surstylus. Surstylus slightly higher than epandrium, very narrow, and with apex tapered and slightly arched outwards; inner surface entirely confluent with subepandrial sclerite, which has dense cluster of tubercle-like setae subapically. Cercus flat, relatively broad. Hypandrium subtriangular in ventral outline, with halves broadly fused to phallapodeme; densely setose lateromedially and on posterolateral process; posteroventral margin folded inwards to meet base of pregonite. Pregonite straight, tapering to apex, with two ventromedial setae, lateral surface minutely textured to spinulose. Basiphallus subcylindrical, broadly sclerotized laterally and dorsolaterally, and with broad, reticulated membranous flap posteroventrally. Distiphallus with one pair of dark bands on narrow, ribbon-like base; distal half composed of one pair of long clear tubules past a dark nodule. Ejaculatory apodeme not located in dissected male.

Distribution. Philippines.

Lectotype: PHILIPPINES. 3882/Butuan, Mindanao/ Baker (1♂, MSNM).

Material examined. PHILIPPINES. Leyte: Mt. Lobi, 1000ʹ, viii.1945, Laffoon (1♂, CNC), Misamis Or.: Hinsangon, 20km S of Gingoog, 600–700m, 20–24.iv.1960, H. Torrevillas (1♀, BPBM), Misamis Or.: Minalwang, 1050m, 24.iii–4.iv.1961, H. Torrevillas (1♀, BPBM), Misamis Or.: Balason, 4–5.iv.1960, H. Torrevillas (3♂ 4♀, BPBM), Balason, 1.iv.1960, H. Torrevillas (3♀, BPBM), Misamis Or.: Minubanan, 1050–1200m, 5–9.iv.1961, H. Torrevillas (1♂, BPBM), Mindanao: Zamboanga del Norte, Manucan, 25km S, 500m, 18.x.1959, L.W. Quate (1♀, BPBM), Mindanao: Agusan, S. Francisco, 10km, SE, 15.xi.1959, C.M. Yoshimoto (1♀, BPBM), 17.xi.1959 (1♂, BPBM), Agusan, S. Francisco, 10km, SE, 12.xi.1959, L.W. Quate (1♂ 1♀, BPBM), 13.xi.1959 (2♀, BPBM), 14.xi.1959 (1♀, BPBM), Mindanao: Lanao: Butig Mts., 24km NE of Butig, 1080m, 21.vi.1958, jungle along stream, H.E. Milliron (1♂, CNC), Mindanao, 6.v.1920, Dr. A. Moore, B.M. 1921-449, on foliage / “ nothybus spec.” [handwritten] Examined & det. W. Hennig, 1936 (1♂, BMNH), Palawan: Eran Pt., 8km SW Tarumpitao Pt., 31.xii.1959 - 4.i.1960, at light, L.W. Quate (1♀, CNC).

Comments. Nothybus triguttatus is the only species of Nothybus known from the Philippines. Its nearly uniform yellow colouration and relatively pale wings make it readily identifiable.