398 / NEW YORK STATE MUSEUM 
Corethra trivittata Loew 
Berl. Ent. Zeit. 1862. Centur. 2, p. 186 
Male. Pale yellowish, with three thoracic stripes, the meta- 
notum, fasciae of the abdomen, with apical rings of the femora, 
and basal and apical rings of the tibiae, fuscous black; the 
wings with cinereous spots. Length 4.3mm. Wing 5mm. 
Pale yellowish, with long, mostly subfuscous pile. Antennae 
black, annulated, densely verticellate with subfuscous hairs. 
Dorsum of thorax with three black stripes, the double median 
oue posteriorly, the lateral stripes anteriorly, much shortened. 
The sides of the scutellum fuscous; metanotum fuscous black; 
the abdomen fasciate with fuscous. Legs pale yellow; the tarsi 
from the tip of the first joint pale fuscous; an apical ring on 
each of the femora and an apical and a basal ring on each tibia 
is blackish. The wing variegated with some smail cinerous 
black spots. Maine, California, Alaska. (Osten Sacken) 
This is a synonym of C. punctipennis according to Giles 
in Gnats or Mosquitos. | 
The larva and pupa of this species are described by Dr Dyar.! 
The only apparent difference between this and the larva of 
plumicornis seems to be that in the former species there 
are but two hairs on dorsal surface of anal segment while there 
are fourtin plumi¢cor nis. 
Corethra albipes nov. sp. 
Female. Entire insect pale yellow in ground color; head and 
antennae wholly. pale yellow; dorsum of thorax with three lon- 
gitudinal stripes pale buff in color, the lateral ones abbreviated 
anteriorly, the median one posteriorly, the latter divided longi- 
tudinally by a pale yellow line. These stripes all narrowly mar- 
gined with brown, and on the anterior and outer margins of 
the lateral stripe are a few tiny black specks. Scutellum with 
a pale buff posterior margin; pleurae yellow, sparsely sprinkled 
with small, irregular black specks; abdomen yellowish white 
beneath, pale buff colored above, lateral margin sparsely sprin- 
kled with small irregular black specks; legs pale yellowish, 
unspotted, fourth and fifth tarsal joints slightly darkened; claws 
simple; legs and abdomen covered with long, loose yellow hair; 
wings uniformly pale yellowish, the veins, the hair on them, 
and the halteres same color. Venation as in plate 39, figure 11. 
Length 53mm. Ithaca N. Y. August 1901. 
1N. Y. Ent. Soc. Jour. 10:201. 
