1920] Melander — Synopsis of the Dipterous Family Psilidw 95 



10. Palpi wholly black; third antennal joint round, wholly yellow 

 (eastern) or upper edge dark (western) ; frontal triangle 



black. (N. H., Alaska*) levis Loew 



Palpi with black tip; third antennal joint oval, tipped with 

 black; only ocellar spot black. (Europe*; Can., N. Y., 

 Colo., Wash.*) ros(£ Fabricius 



Psila microcera sp. nov. 



Male. Length, 4 mm. Entirely yellow except for the black 

 ocellar prominence and the black upper edge of the third antennal 

 joint. Frontal triangle almost reaching the suture, periorbits 

 distinct, one fronto-orbital, postverticals diverging and long, 

 cephalic bristles black; antennae short, third joint rounded, 

 slightly longer than deep, arista bare and black. Eyes nearly 

 round, equal to the longest diameter of the cheek. Thoracic 

 bristles black, strong, two notopleural, one supra-alar, one dorso- 

 central, two scutellars. Wings hyaline, with a yellowish tinge, 

 veins yellow, sections of the fourth vein proportioned 2:7:5, 

 of the fifth vein 12 : 1, posterior crossvein transverse. 



A single specimen collected by Professor A. L. Lovett at Duffy 

 Prairie, Ore., July 26, 1915, and presented by F. R. Cole. Three 

 females collected by R. C. Shannon at Sprague, Ewan and Medical 

 Lake, Wash.* The last mentioned specimen has the bristles 

 yellow. 



Psila colorata sp. nov. 



Male. Length, 4 mm. Head yellow, a small black spot between 

 the ocelli; lower occiput swollen; third antennal joint twice as long 

 as deep, black beyond the arista, which is yellow, and white-pilose; 

 mouthparts yellow; cephalic bristles long and black, no fronto- 

 orbitals. Mesonotum, scutellum, center of metanotum, and lower 

 pleura? yellow, humeri, mesopleurae, pteropleurje and sides of 

 metanotum black, prothoracic spiracle yellow; thoracic bristles 

 black, hairs yellow, one dorsocentral, pleural hairs sparse. Abdo- 

 men black. Legs wholly pale yellow, apical spurs small and 

 yellow. Halteres whitish; calypteres luteous, the fringe blackish. 

 Wings with yellow tinge becoming brownish apically, veins luteous, 

 the third vein becoming brown, sections of fourth vein propor- 

 tioned 1 : 1 : 2 : 2,1, the last section slightly arched, posterior 



