270 A. L. MELANDER. 



One female ; July, Kukak Bay, Alaska (Kincaid). One male ; 

 Eastport, Maine (Nat. Mus.). 



Hilara Wheeleri Melander (Fig. 95). 

 Psyche, 1901, p. 214. 



Opaque true black, covered witb a very fine gray-glaucous coating. Head, 

 thorax and abdomen with a few pale short hairs in addition to the dark bristles. 

 Antennae black, short, third joint short, conical, its arista equal to itself. Palpi 

 testaceous, witb pale hairs ; proboscis piceous, generally less than one-half the head 

 height. Thorax not vittate, its short hairs irregularly, almost serially arranged ; 

 scutellum with four black bristles, the inner pair long. Abdomen opaque-black, 

 most often compressed in the male and cylindrical or depressed in the female ; no 

 conspicuous bristles, the short sparse pubescence pale ; hypopygium not of greater 

 depth than the abdomen, sessile, rarely distinctly separated from the abdomen 

 above, compressed, its lateral valves subglabrous, the dorsal filament thick, but 

 almost always hidden. Legs fuscous to piceous. The males as a rule have the 

 legs darker, but the fore tibise are always fuscous. The pubescence is pale yel- 

 low ; no conspicuous macrochsetse are present, though the hairs of the upper edge 

 of the male fore tibiae are longer. The middle and hind coxae are black, the fore 

 coxae more or less fuscous; tarsi black, the remainder of the legs variable in 

 color, from fuscous to piceous. The front metatarsi of the males enlarged, ovoid, 

 the distal third of the inner side is excised for the reception of the remainder of 

 the tarsus, which thus is not attached to the tip of the metatarsus. The front 

 tibiae of the males are somewhat thickened. Wings cinereous-hyaline, stigmal 

 spot faintly brown, neuration normal. 3.5 mm. 



Wyoming (Wheeler). 



In the lot of twenty specimens, one exhibited a peculiar case of 

 tandem hermaphroditism. This specimen has the anterior part of 

 the body formed as in the males, while the posterior portion is 

 female. The reader is referred to the description in Psyche for an 

 account of this case of gynandromorphism. 



Species of Hilara described by Francis Walker. 



Hilara plebeia Walker. 

 Trans. Ent. Soc. Lond., N. Ser., iv, p. 148. 



Black; fore legs ferruginous; wings limpid, veins and stigma black; halteres 

 tawny. 2.5 mm. 



United States. 



Hilara transriiga Walker. 

 List of Dipt. Ins., iii., p. 491. 



Body black, clothed with short black hairs; eyes, mouth and feelers black; 

 legs piceous, clothed with black hairs; wings dark brown; wing-ribs and veins 

 black; brands black ; poisers piceous. 4 mm. 



Hudson's Bay. Ten specimens (Kincaid), Alaska ; determination 

 by Mr. Coquillett. 



