the; mycetophiIvId.'T; of north America. 251 



narrow lateral margins, and 3 slender stripes, brown or black; 

 elsewhere the thorax is yellow, save 2 spots on the pleura, and 

 the metanotum for the greater part, which are black. Abdomen 

 cylindrical, black, the venter and immediate base yellowish. 

 Coxae and legs yellow ; the terminal j^ortion of the tibiae, and 

 the tarsi, brownish ; metatarsi about 3-4 of the length of the 

 tibiae ; all the tibiae with a single spur and without spines. 

 Wings lightly tinged; RH-> enters Ri near its tip. St. Vincent, 

 Isl. 



I have seen a specimen from one of the Lessor Antilles. 

 The ending of R2+3 in Ri, the length of the petiole of the media, 

 the absence of the subcostal crossvein (fig. 85) and the posses- 

 sion of but a single spur on each tibia, are characters which 

 combined mark this species as one widely remote from other 

 Platyiira. It should perhaps be made the type of a new genus. 



2. Platyiira fasciola Coquillett. 

 1894. fasciola Coquillett, Entomol News. 126 (Ceroplatus). 

 Female. Length 10 mm. Head including greatly flattened 

 antennae and large palpi, dark brown; the retracted proboscis, 

 base of the third antennal joint, a small spot beneath each 

 antenna, yellow. Thorax shining brown, a medio-dorsal vitta 

 on posterior half and lateral margins yellow; pleura yellowy a 

 large spot above the middle coxae and a small one above hind 

 coxae, dark brown. Scutellum yellow, its base brown, center 

 of metanotum dark brown. Abdomen shining, blackish brown, 

 base of each segment except first, yellow, on second, third and 

 fourth segments prolonged posteriorly is an indistinct dorsal 

 vitta ; coxae and femora yellow, bases of middle and hind 

 femora, and of hind coxae blackish brown, tibiae and tarsi 

 brownish yellow. Wings pale yellowish, the apex between tip 

 of Ri and apex of Cui, blackish, apex of Cu, bordered with black- 

 ish, this color projecting into the cell of Cui near its middle. 

 Apex of subcostal vein far beyond origin of the radial sector, 

 being opposite origin of M. Subcostal crossvein before middle 

 of the distance between humeral crossvein and tip of the 

 subcostal vein ; 'R2-\-:: very oblique, ending in costa beyond apex 

 of Ri. Knob of haltcres black. Washinqlon. 



