72 BUULETIN 116, UNITED STATES NATIONAL MUSEUM. 



scarcely be traced. Fore tursi about one and a fourth times as long 

 as their tibiae, yellow, the tips of the joints being brown, sometimes 

 they are infuscated from the tip of the first joint, basitarsi about the 

 length of the three following joints taken together, fourth and fifth 

 joints of about equal length. Middle tarsi a little longer than their 

 tibiae, black from the tip of the first joint. Hind tarsi one and a half 

 times as long as their tibiae, wholly black. Calypters and halteres 

 yellow, the former with black cilia. 



Wings strongly and rather uniformly tinged with blackish (fig. 32)^ 

 but often more gray toward their base and along the hind margin;, 

 costa with a small knotlike enlargement at tip of first vein; last 

 section of fourth vem slightly bent before its middle; hind margin of 

 wing slightly indented at tip of fifth vein; anal angle prominent, the 

 wing being of nearly equal width. 



Female. — Face narrow for a female, yellowish gray; third antennal 

 joint very small; hind femora not ciliated; wings strongly tinged 

 with yellowish brown in front as far back as the fourth vein and 

 narrowly brownish along the fifth and cross veins; back of fourth 

 vein the wing is brownish gray; wings shaped about as in the male, 

 still a little more rounded on hind margin. 



Redescribed from the type specimen in the collection of J. M. 

 Aldrich taken at Jamesburg, New Jersey, July 4, 1891; also 1 female 

 taken at the same place on Jul}^ 4, 1894; 2 males taken by N. Banks 

 at Beltsville, Maryland, June 9, in a swamp; and 1 male taken by 

 W. L. McAtee, at Beltsville, Maryland, July 4, 1916. 



No. 33. DOLICHOPUS APPENDICULATUS, new species. 



Male. — Length 4 mm.; of wing 3.8 mm. Face long, reaching 

 below the lower corner of the eye, rounded below, without the trans- 

 verse ridge which usually separates the upper from the lower portion 

 of the face in this genus, silvery white. Front green, usually with 

 bronze reflections and somewhat dulled with whitish pollen. First 

 two joints of antennae mostly yellow, black or brown on upper edge; 

 third joint about one and a half times as long as wide, oval, but ob- 

 tusely pointed at tip; arista inserted a little before the tip of third 

 joint, longer than the antenna. Lateral and inferior orbital cilia 

 silvery wnite, much flattened, the black cilia of upper orbit short 

 and stout, reaching down about one-third of the eye height. 



Thorax shining green, sometimes with bronze reflections, which 

 form in some specimens as many as five indistinct vittae on the 

 dorsum; in one female the dorsum is more coppery than green; 

 pleurae scarcely dulled with pollen. Abdomen shining green, 

 usually with coppery reflections on the dorsum before the incisures, 

 the last two segments mostly coppery on the upper surface. Plypopy- 

 gium black; its lamellae rather large, somewhat triangular in out- 



