40 
Psyche 
[March 
21 Antennae wholly black 22 
Antennae partly yellow 30 
22 Knobs of halteres blackish 23 
Knobs of halteres yellowish 24 
23 Last section of fifth vein to cross-vein as 9 to 28, (Oregon) 
longinervis Van Duzee, new species. 
Last section of fifth vein and cross-vein of about equal 
length, (Ontario) halteralis Van Duzee. . . . 
24 Second joint of hind tarsi slightly more than twice as long as 
first 25 
Second joint of hind tarsi considerably less than twice as 
long as first 26 
25 Metallic blue in color, (Illinois) coerulescens Malloch. 
Black in color, (Eastern) vitatus Van Duzee. 
26 Hairs of the abdomen black 27 
Hairs on the abdomen pale 29 
27 Second joint of hind tarsi one and a fourth times as long as 
the first ; last section of fifth vein over twice as long as the 
cross-vein, (Ontario; New York). .. .frontalis Van Duzee. 
Second joint of hind tarsi one and a half times as long as 
first 28 
28 Last section of fifth vein only a little longer than the cross- 
vein, (California) obscuripennis Van Duzee. 
Last section of fifth vein twice as long as the cross-vein, 
(Ontario) ciliata Van Duzee, new species. 
29 Second joint of hind tarsi nearly one and three-fourths times 
as long as first, (Alaska) bicolor Van Duzee. 
Second joint of hind tarsi about one and a third times as 
long as first, (Alaska) parvus Van Duzee. 
30 Thorax with distinct gray vittae 31 
Thorax without distinct vittse 33 
31 Dorsum of thorax with four gray vittse (Idaho) 
aldrichi Wheeler. 
Dorsum of thorax with a distinct gray stripe each side of the 
acrostichal bristles 32 
32 Last section of fifth vein one and a half times as long as the 
cross-vein, (Washington; Alaska) viduus Wheeler. . . 
