THE CANADIAN ENTOMOLOGIST. 275 



white. Wings thickly clothed with pale gray hair; near base is a band of 

 black hair, heaviest behind; slightly beyond the middle of the wing there 

 is a black spot on the costal margin and another opposite on the posterior 

 edge, the latter rather the larger ; the extreme margin around the tip 

 appears more or less black. The fringe is mostly pale gray, or almost 

 white, on the hind margin; on the base of costal margin it is dark gray; 

 that on posterior margin is almost one-half the width of the wing. Wings 

 rather narrow and acute at tip. Length of wing, 1.7 mm. 



Taken at Washington, D. C, on the bark of trees, in the early part 

 of August. Easily known by the two black spots on each wing. 



Psychoda albitarsis. Banks. — I have seen specimens only from the 

 type locality, Ithaca, N. Y. 



Psychoda marginalis, Banks. — I have only the types of this species j 

 from Sea Cliff, N. Y. It is very distinct by the two patches of black hair 

 on wings. 



PsycJioda Slossonce, Williston. — My specimens are all from New 

 York. 



Psychoda superba, Banks. — This handsome species is very common 

 at Washington, I). C , from June to August, on the bark of large trees. 



Psychoda bico/or, Banks. — I have seen only the types from Sea Cliff, 

 N. Y. 



Psychoda nigra, Banks. — I have taken several specimens of this 

 species at Falls Church, Va., close to a stream, in June. The fringe on 

 the hind margin of wings is very long. 



Psychoda uitida, n. sp. — Thorax in front densely clothed with long 

 gray hair, behind at the bases of wings it is darker, often black. Abdo- 

 men black, with jet black hair. Legs black, with black hair; on the basal 

 joints of all tarsi are some white scale-like hairs. Wings clothed with 

 black, and some iridescent scales showing a bluish, greenish or coppery 

 hue, according to the light and position. Fringe black, white at tip 

 of wing. Tips of veins usually show heavier patches of black hair 

 or scales. Antennae slender, moniliform, slightly longer than the width of 

 wing. Wings moderately broad, scarcely acute at tip, the fringe on 

 posterior margin being about one-fourth the width of the wing. 



Length of wing, 2.6 mm. 



This species is found at Washington, D. C, on the bark of large 

 trees, in July. The iridescence of the scales on the wings at once sepa- 

 rates it from all our other forms. 



