Liriomyza montana Sehgal

Lonsdale, Owen, 2011, The Liriomyza (Agromyzidae: Schizophora: Diptera) of California 2850, Zootaxa 2850 (1), pp. 1-123 : 74-76

Liriomyza montana Sehgal

Figs 161–164

Liriomyza montana Sehgal 1968: 67 . Spencer 1969: 179.

Wing length 2.0– 2.7mm (♂). Female unknown. Length of ultimate section of vein CuA 1 divided by penultimate section: 1.8–2.3. Eye height divided by gena height: 4.5–5.8. Scutum shining.

Chaetotaxy: Two ori, two ors. Acrostichal setulae in four rows.

Colouration: Calypter margin and hairs grey. Head light yellow with first flagellomere yellow, ocellar tubercle and back of head brown, clypeus yellow or slightly brownish, and posterolateral region of frons brown excluding base of vertical bristles (thin brownish stripe sometimes present between verticals, outer base of inner vertical sometimes deep yellow to brownish, or outer vertical encompassed by brown spot excluding yellow spot at base of bristle). Scutum dark brown with complete yellow lateral stripe that sometimes extends partially along posterior margin; katatergite yellow; anatergite brown, becoming yellow lateral to scutellum dorsally and darker beneath scutellum. Anepisternum yellow with faint to broad oblique stripe and sometimes posteroventral margin brown; anepimeron with faint to distinct mottling; meron brown with dorsal and sometimes anterior margins yellow; katepisternum brown on ventral ¾ (not encompassing base of bristle) or with large triangular ventral spot. Legs yellow with base of coxae brown, base of femora sometimes brownish (sometimes only dorsally, and/or with pigment faded on fore and mid legs), scraper on hind femur sometimes brown, fore tibia brownish, becoming paler to base, mid tibia similar but slightly darker, hind tibia brown (sometimes yellow at base and apex), and tarsi brown, becoming paler to base; Canadian material with additional brownish striations on femora. Broad lateral yellow margin on abdominal tergites becoming wider anteriorly, and posterior margin of tergites thinly yellow; epandrium light brown.

Genitalia: Figs 161–164 . Spines on surstylus and epandrium absent. Basiphallus fused to phallophorus and with lateral margins and dorsum sclerotized, excluding basomedial fossa. Swollen distal section of ejaculatory duct with ventral curve. Paraphallus absent. Hypophallus surrounded ventrally by broad membranous lobe, with constricted base fused to venter of distiphallus and with long fringe of hairs. Mesophallus indistinct. Distiphallus long, strongly angled dorsally, with ventral suture (broadly separated by thin plate apically), with slight bend at midpoint and with small apical bowl surrounding thin, dark paired medial processes; bowl barely wider than stem. Ejaculatory apodeme with ends of pileus ejaculatorius dome-like with long apical process; base of stem broad, gradually widening into blade; base of duct broad and sclerotized; blade with light marginal sclerotizations.

Host. Unknown, likely Poaceae .

Range. USA. California [Kern*, Riverside*]. Canada. Alberta.

Type material. Holotype, CANADA. Alberta: Jasper , 17.vi.1966, V. K. Sehgal (1♂, CNC) ; Paratype examined, CANADA. Alberta: Same collection as holotype (1♂, CNC) .

Additional material examined. USA. California: Kern Co., Fort Tejon State Park , 5.iv.1980, P.H. Arnaud, Jr. (1♂, CASC) , Riverside Co., Riverside , 5.v.1935, A.L. Melander (1♂, USNM) .

Comments. Aside from being considerably paler than its Nearctic relatives, the distiphallus of Liriomyza montana is also considerably thinner with the apical bowl barely wider than the stem. Since the vertical bristles are sometimes entirely surrounded by yellow and the “ L. septentrionalis ” type abdominal pattern is difficult to distinguish, this species comes out in multiple places in the key. The holotype collection locality was incorrectly stated in Spencer (1969) (“Banff, 28.vi.1966 ”). See comments for L. graminaceae .

Figures

FIGURES 161–164. Liriomyza montana Sehgal, male genitalia; 161: external components, ventral; 162: ejaculatory apodeme; 163: phallus, ventral; 164: phallus, left lateral.