Scholastes hirtiventris, Malloch, 1942

Mailoch, J. R., 1942, Trypetidae, Otitidae, Helomyzidae, And Clusiidae of Guam (Diptera), Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 201-210 : 208

Scholastes hirtiventris , new species.

Male and female. A black species much like S. distigma Hendel , but differing from it and any other species known to me in having the large discal abdominal plate of the female furnished with dense long stiff hairs that are sparser basally.

Head testaceous yellow, black on occiput except margin, two broad frontal bands as in S. aitapensis , a large mark on genae, a narrow line across lower extremities of facial foveae, a spot between base of each antenna and eye and another on central facial carina between antenna! bases. Antennae red, third segment dark on upper edge; palpi red. Frons a little longer than its anterior width, slightly narrowed behind; anterior carina distinct; bristles normal. Arista long haired to near apex, without apical pallette. Thorax black, humeri yellow, with a black spot, the usual pale yellow sublateral lines conspicuous, as is also the one around the apex of scutellum and one on upper margin of pleura. Supra-alar bristle strong; dorsocentrals 2 pairs; prescutellar pair of acrostichals as strong as posterior dorsocentral pair. Lqgs black, fore coxae brown, basal segment of all tarsi except its extreme apex whitish yellow. Wings grayish hya!ine, with blackish brown marks as follows: a fascia from basal half of the stigma passing through discal cell before middle, and not attaining hind margin, another fascia from apex of first vein passing over outer cross vein and divided from middle of latter to hind margin, a large subquadrate mark over apical fourth of second vein that extends backward over fourth vein and usually forks from there to hind margin, a spot in wing tip that does not extend entirely to edge of wing, a partial streak from costa to inner cross vein, and some spots in basal third of wing. Fifth vein bare. Abdomen black, with distinct blue tinge. Tergites in male with numerous short black hairs, in female, the large dorsal plate has dense, long, stiff, apically directed black hairs except basally, and in this sex, membrane between large plate and sternites also densely covered with rather shorter stiff black hairs. Length, 7-8 mm.

Agana, May 25, 0. H. Swezey , type female; Ritidian Pt., April 15, Bryan , allotype male.

The description of the wing markings is drawn from the wings of the male as those of the female are rather badly torn.