124 Psyche [June 



about as in Dolichopus, black, greenish on basal half; its lamella 

 large, somewhat oval Init tapering into the stem, yellowish with 

 a wide 1)lack l)order on the apical margin, which is jagged and 

 fringed with long black bristles. 



C*ox», femora and tibiae yellow; middle coxa? blackened on outer 

 surface, hind ones a little infuscated at base ; fore cox^ covered 

 with black hairs on their anterior surface, hind ones with one large 

 and one small bristle on outer surface. Middle and hind tobifs 

 each with four blackish spots on upper surface where the bristles 

 are inserted. Fore tarsi a little longer than their tibiae, a little 

 blackened from the tip of the first joint; middle and hind tarsi 

 black from the tip of the first joint, the latter with the first joint 

 distinctly shorter than the second. Calypers and halteres pale 

 yellow, the former with black cilia. 



Wings grayish, tinged with brown in front of the third vein; 

 broad, distinctly expanded at tip of fifth vein; anal angle promi- 

 nent, although the hind margin of the wing is slightly excavated 

 at tip of sixth vein ; costa slightly thicker from the tip of the 

 first vein; last section of fourth vein nearly straight, ending a 

 little before the apex of the wing, nearly parallel with third vein, 

 which is a little bent backward so as to approach fourth vein a 

 very little at tip ; cross- vein a little more than its length from the 

 wing margin, measured on fifth vein. 



Female : Face a little wider than in the male ; color of head, 

 thorax, abdomen and legs as in the male; wings as in the male, 

 but not quite as wide at tip of fifth vein. 



Described from three males and three females; I took the holo- 

 type and allot3'^pe at Dayton, Erie County, N. Y., July 5, 1920; 

 two males were taken by Mr. Banks at Falls Church, Va., May 30 ; 

 one female was taken by Mr. Hine at Kent, Ohio, June 18 ; and 

 one female was taken at Bridge water, Mass., July 11. 



Table of North American Species of Thripticus. Males. 



1. Femora black, or green 2 



Femora yellow 4 



2. Hypopygium with yellow lamellae. (Calif.), longicauda sp. nov. 

 Hypopygineal lamell* brovai 3 



3. Hypopygium somewhat oval in outline, rather thick 



\Caiif., Mex., N. Y.) fraterculus Wh. 



