2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



circular, very thin and flat, the dorsal surface entirely silvery, but 

 under a high power showing a single row of delicate black hairs 

 along the hind margin of each segment. First abdominal segment 

 dull black, venter black, the sternites narrow, the membrane greatly 

 developed between them and the tergites, so as to cover almost the 

 whole. Wings sometimes milky, usually subhyaline, the veins black; 

 the costa deeply and obliquely notched before the tip of the first 

 vein. Legs black. 



Length 4.5 mm. 



Described from 9 males taken by the writer on Mount Lowe, Cali- 

 fornia, near the upper end of the electric car line, on July 3, 1917. 



Type-.— Male, Cat. No. 27242, U.S.N.M. 



Family CHLOROPIDAE 



Genus CHLOROPS Meigen 



Chlorops Meigen, Illiger's Magazine, vol. 2, p. 27S, 1S03. 

 CHLOROPS KUWANAE, new species 



Male and female. — General color light yellow, thorax with three 

 broad, opaque, black stripes, the inner much abbreviated behind, and 

 a small black 'stripe above each wing. Front about half as wide as 

 head, dull yellow with only small and scattered hairs; frontal tri- 

 angle shining, the sides convex, apex drawn out in a long point 

 which reaches the lunule; a roundish black spot covers all the tri- 

 angle except the point and the basal angles, the latter j^ellow to the 

 ocelli; antennae of ordinary size, first joint yellow, second brown, 

 third black, with a very blunt upper angle, arista white with yellow 

 basal joint. Face light yellow, white in male, bucca of same color, 

 one-fifth the eye height; epistoma not much projecting. Palpi, 

 proboscis and edge of mouth pale yellow. Occiput yellow, a large 

 black spot extending downward from the vertex, widening below. 

 Thorax shining except the dorsal stripes, with dark hairs and very 

 minute bristles; pleurae light yellow, with a small black spot below 

 the anterior spiracle, an interrupted oblique brown one on the meso- 

 pleura, the lower three-fifths of sternopleura light brown, sometimes 

 with blackish upper edge. Scutellum convex, with two pairs of 

 small bristles. Halteres pale yellow. Abdomen wholly pale yellow 

 except four transverse black bands at the bases of the segments, 

 which do not quite reach the lateral margin. Legs wholly yellow 

 except the last tarsal joint of the middle and hind ones, and the last 

 two joints of the front ones, which are brown. Wings hyaline; 

 crossveins separated by a distance equal to two-thirds of the last 

 segment of the fifth vein ; third and fourth veins hardly divergent ; 



