42 Psyche [March 
42 Dorsum of thorax with a yellowish vitta; antennae wholly 
black, (Idaho) aurivittatus Wheeler. 
Dorsum of thorax opaque with gray pollen; first two joints 
of antennae yellow, (Washington). . . . cyanog aster Wheeler. 
43 Males and females 44 
Males only 53 
44 Thorax with distinct vittae 45 
Thorax without distinct vittae 50 
45 Last section of fifth vein only half as long as the cross-vein, 
(New Jersey) princeps Wheeler. 
Last section of fifth vein as long or longer than the cross- 
vein 46 
46 Last section of fifth vein about the same length as the cross- 
vein 47 
Last section of fifth vein distinctly, although only a little 
longer than the cross-vein 49 
47 Legs and feet black; knobs of halteres infuscated, (New 
Jersey) modestus Van Duzee. 
Tips of femora, tibiae, base of tarsi and knobs of halteres 
yellow 48 
48 Tips of third and fourth veins close together, as is typical of 
the genus; rather large species, (California) 
calif orniensis Wheeler. 
Tips of third and fourth veins a little wider apart than 
usual, (North America) veles Loew. 
49 Abdomen and pleurae black; face opaque with brown pollen; 
thoracic vittae very distinct; tips of third and fourth veins 
rather far apart, (North America) veles Loew. 
Abdomen, pleurae and face distinctly green; thoracic vittae 
less distinct; tips of third and fourth veins close together 
as usual in the genus, (New York; New Jersey; Alaska). 
distindus Van Duzee. 
50 Legs yellow; cross-vein with, a stump vein at its center, 
(Wyoming) appendiculatus Wheeler. 
Legs black, at least the femora largely black; cross-vein 
normal, without a stump vein 51 
