Figs 194–199

Agromyza quadrisetosa Malloch 1913: 332.

Liriomyza quadrisetosa. Frick 1952a: 405, 1959: 409; Spencer 1969: 183, 1981: 260; Spencer & Steyskal 1986: 114.

Description. Wing length 2.2–2.5mm (♂), 2.5mm (♀). Length of ultimate section of vein CuA 1 divided by penultimate section: 1.8–2.6. Eye height divided by gena height: 2.1–2.7. Epistoma large. Parafacial and orbital plate (anteriorly) prominent and projecting. Scutum shining to subshining.

Chaetotaxy: Five ori; one ors. Acrostichal setulae in two irregular rows. Four dorsocentrals, all long and subequal in length.

Colouration: Calypter margin and hairs dark brown. Orbital plate dark to base of fronto-orbital bristles; face, ocellar tubercle, back of head, first flagellomere, clypeus and palpus dark brown; remainder of head yellow. Thorax dark with postpronotum (excluding anterior spot), notopleuron, supra-alar spot and dorsal margin of anepisternum (dorsal 1/5, with yellow stripe becoming broader posteriorly). Legs entirely dark. Abdomen dark with posterior margin of tergites 2–5 yellow; posterior margin of tergite 6 yellow in female.

Genitalia: Figs 194–199. Epandrium heavily-setose posteriorly and with inner-distal margin lined with small tubercle-like bristles. Surstylus large, truncated and with numerous tubercle-like bristles on inner face. Subepandrial sclerite relatively dark and small with pronounced anteromedial process. Hypandrium elongate with pointed inner-medial process and long, tapered apex. Basiphallus fused to phallophorus, with posterior surface minutely haired, with shallow outer-distal lobes, and only extending to base of widened, sclerotized portion of ejaculatory duct. Hypophallus densely haired, broad to base and with tapering, posteriorly-directed medial process; side of phallus with broad membranous “wings”. Distiphallus lightly-sclerotized and composed of two thick tubules that are more narrow and approximated to base; base of tubules surrounded by thick, haired collar.

Hosts. Unknown, possibly Clematis (Ranunculaceae) (Spencer & Steyskal, 1986).

Range. USA: California, Indiana*, New York, Texas, Utah*. Canada: Quebec.

Type material. Holotype, USA. Texas: San Antonio, 8.iv.1907, F.C. Pratt (1♀, USNM, type No. 15957); Paratype examined, USA. Texas: “Brnsville”, Jones & Pratt (1♀, USNM).

Additional material examined. USA. Indiana: Lafayette, 3.vi.1915 (1♀, USNM), Utah: Richfield, 15.viii.1930, Beet Coll (1♀, USNM).

Comments. Liriomyza quadrisetosa is a large, distinct species that is widespread but uncommon in North America. It can be diagnosed by six fronto-orbitals, a produced parafacial and orbital plate, two irregular rows of acrostichal setulae, multiple minute spines on an enlarged surstylus and epandrium, and a similarly large, robust and distinct hypandrium and phallus.