94 Psyche [October 



2. Entire insect yellow, except the black frontal or ©cellar triangle; 



arista, and cephalic and thoracic bristles black 3 



Head and thorax yellow, abdomen wholly black; arista and 

 bristles yellow, the arista short-pubescent; tip of palpi black 

 {bicolor Meigen) 4 



3. Frontal triangle large, black, polished; arista, pubescent; an- 



tennae half as long as the face. (N. H.) 



frontalis Coquillett 



Only ocellar triangle black; arista bare; antennae distinctly 



less than half the facial length. (Ore.) . . microcera, sp. nov. 



4. Metanotum wholly yellow (Europe, N. H., Can., Mont.,* 



Wyo.,* Wash., Alaska) var. bicolor Meigen 



Metanotum centrally black (Can., Colo.,* Wyo.) 



var. dimidiata Loew 



5. Mesonotum yellow the humeri alone black; only upper pleurae 



black; bristles of head and thorax black; third antennal 



joint dark 6 



Mesonotum centrally black 7 



6. Head entirely yellow except the small ocellar spot; palpi yellow 



(Tex.*) colorata, sp. nov. 



Occiput bimaculate; palpi black (N. J., D. C, Wis.) 



lateralis Loew 



7. Bristles of head and thorax black; legs mostly black; antennae, 



the nearly bare arista, and the palpi black; head and sterno- 



pleurae black 8 



Bristles of head and thorax yellowish; coxae and legs yellow; 

 arista yellowish; head yellowish 9 



8. Base of arista thick; last section of fourth vein arched and 



shorter than the penultimate section. (Wash.*) 



V ashingtona sp. nov. 

 Arista not thickened; last two sections of fourth vein equal; 

 face greatly receding; two dorsocentrals. (Idaho*) 



atrata, sp. nov. 



9. Sternopleurae black; at least tip of palpi blackened; third 



antennal joint mostly or wholly yellow 10 



Sternopleurae black; palpi and antennae yellow; mesonotum 



with short white pilosity (Mex.) exigua Wulp 



Sternopleurae yellow; palpi wholly yellow; third antennal joint 



black. (N. Y.,* N. J.,* 111.',*' Wis.) sternalis Loew 



