the; mycetophiIvId.^ of north America. 259 



the orbits emarginate. Thorax reddish-yellow; the dorsum 

 red, with four brown stripes, sometimes feebly marked or obso- 

 lete. Abdomen red, or reddish-yellow, with a black band of 

 variable width at the posterior part of each segment; venter 

 yellow. Coxae and femora light yellow; tibize yellow, the tarsi 

 brownish ; tibiae without spines ; metatarsi about as long as 

 their tibiae; all the tibiae with a single terminal spur. Wings 

 uniformly brownish; Re-fs oblique, terminating in the costa. 

 The antennae are about as long as the dorsum of the thorax. 

 St. Vincent Isl. 



16. Platyura moesta n. sp. 

 Male. Length 4 mm. Head black; antennae fuscous, scape 

 and mouth parts yellow. Thorax dull yellow with five longi- 

 tudinal lines of black setul^, lateral lines widest, setulae longest 

 over base of wings and upon scutellum; metanotum slightly 

 brownish. Basal half or two-thirds of each abdominal tergite 

 black, whole of remaining tergites black, venter yellow except 

 for the black apical margin of each segment; hypopygium (fig. 

 106) brown. Legs yellow, tibice and tarsi apparently darker; 

 fore metatarsus about 5-8 as long as the tibia; each claw with 

 three teeth. Wing hyaline, slightly cinereous ; veins yellow, 

 the heavier veins more dusky; subcosta ends proximad of base 

 of the radial sector, the crossvein is proximad of the first third 

 of distance from the humeral crossvein to apex of the subcosta ; 

 R2-I-3 oblique and encls about one-fourth of the distance from 

 tip of Ri to tip of R4-}-=; coalesced part of the media is about 

 2-3 as long as the petiole, anal vein produced to the wing 

 margin. Halteres yellow. Taken August 2 at Longmire's 

 Springs, Mt. Rainier, Washington, by Professor Aldrich. 



17. Platyura mendosa Loew. 

 1869. mendosa Loew, Berl. Ent. Zeitschr. XIIL 135. 

 Male. Length 3.5 to 4 mm. Deep yellow, antennae except 

 the scape, and abdomen dusky; tarsi apparently fuscous; fore 

 metatarsus about one-sixth shorter than the tibia. Wing 

 yellowish, cinereous tinged, veins yellowish ; apex of the R<+» 

 and the costa with an indistinct cinereous cloud ; subcosta ends 

 in the costa about two-thirds of the length of the basal cell. 

 Subcostal crossvein is proximad of the middle of the subcosta; 



