398 / NEW YORK STATE MUSEUM 



Corethra trivittata Loew 

 Berl. Ent. Zeit. 1862. Gentur. 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 eubfuscous pile. Antennae 

 black, annulated, densely verticellate with subfuscous hairs. 

 Dorsum of thorax with three black stripes, the double median 

 one 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 small ciuerous 

 black spots. Maine, California, Alaska. (Osten Sacken) 



This is a synonym of 0. 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 four in plumicornis. 



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 isame color. Venation as in plate 39, figure 11. 

 Length 5^mm. Ithaca N. Y. August 1901. 



1 N. Y. Ent. Soc. Jour. 30:201. 



