THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 51 



ened; last segment of fourth vein as in the figure of Hygroceleuthus ciliatus. Length 

 4.2 mm.; of wing 3.8 mm. 



One male, Kansas. Type in the University of Kansas. 



Resembles D. ovatus, but has wider face, shorter and weaker cilia on hind femora, 

 and the fore tarsi nearly twice as long. 



Copy of original description; type not seen. 



No. 14. DOLICHOPUS DETERSUS Loew. 



Dolichopus detersus, Loew, Cent., vol. 7, No. 79, 1866. — Aldrich, Kansas Univ. 

 Quart., vol. 2, 1893, p. 8. — Melander and Brues, Biological Bulletin, vol. 1, 

 1900, p. 148. 



Male. — Length 4.5-5 mm.; of wing 4 mm. Face rather wide, 

 silvery white. Front shining green. Antennae wholly black; third 

 joint almost orbicular in outline, bu^a little pointed at tip. Inferior 

 orbital cilia white, the black cilia reaching nearly to the middle of 

 the eye height. 



Thorax bright green, shining but dark; pleurae a little dulled with 

 gray pollen. Abdomen dark shining green with black incisures. 

 Hypopygium black; its lamellae (fig. 14a) rather large, somewhat 

 triangular in outline, but rounded on apical margin, blackish, fringed 

 with little hairs, jagged and bristly at tip. 



Coxae, legs, and feet black; knees a little yellowish; fore coxae 

 with white pollen and little black hairs on anterior surface. Middle 

 and hind femora each with one preapical bristle, the latter ciliate on 

 lower inner edge with long black hairs, the longest of which are a 

 little longer than the ^\idth of the femora. Posterior tibiae a little 

 thickened, more so toward their tips; the glabrous stripe on upper 

 surface wide, including the inner row of large bristles. Fore tarsi as 

 long as their tibiae; the first joint being about as long as the remaining 

 four joints taken together. Middle tarsi about as long as their tibiae, 

 hind ones one and a fourth times as long as their tibiae. Calypters 

 and halteres yellow, the former with black cilia. 



Wings (fig. 14) a little grayish; costa with a small knot-like enlarge- 

 ment at tip of first vein; last section of fourth vein bent before its 

 middle; hind margin of wing scarcely indented at tip of fifth vein, 

 but just before its tip the margin has a small lobe, which forms a 

 shallow sinus between the tip of fifth and sixth veins; anal angle 

 rather prominent. 



Female. — Face wide, rather silvery; hind femora without cilia; 

 hind tibiae not thickened; costa without enlargement. Middle tibiae 

 with one bristle below and their basitarsi without a bristle above. 

 The wifng has a slight, but distinct, outward wave or lobe before the 

 tip of fifth vem as in the male, but much less prominent. 



Redescribed from 7 males and 11 females from the following loca- 

 tions: St. Anthony Park, Minnesota; Battle Creek, Michigan 

 (Aldrich) ; Milwaukee, Wisconsin, June 28 (Wheeler) ; Buffalo, New 



