AKT. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 31 



line of the same color on the dorsum of the thorax, extending forward 

 from the depressed space and tapering to a point before reaching half- 

 way to anterior edge of thorax, but in certain lights it can be traced 

 all the way; lower surface of scutollum and the metanotum yellow, 

 the latter with a very fine median metallic line. Abdomen yellow; 

 second segment with a purplish black band which takes up mere than 

 half the dorsum of the segment, but tapers to a point on the sides; 

 third and fourth segments of the same purplish color with only the 

 posterior margins yellow ; fifth segment very small, sixth seeming to 

 form a part of the hypopygium, it is yellow, infuscated at tip and 

 near the venter and covered with pale hairs; the rest of the hair on 

 the abdomen is black. Hj'popygium (fig. 42) black, with very small 

 white lamellae, which are fringed with white hairs. 



Coxae, femora and tibiae yellow with black hair and bristles; tarsi 

 brown; fore tibiae as 98; joints of fore tarsi as 85-52-31-19-12; of 

 middle tarsi as 100-40-32-18-10; joints of posterior pair as 108-37- 

 48-40-9. Halteres yellow, the knobs appearing brown against a light 

 background. Calypters pale yellow, their cilia and a narrow apical 

 margin brownish. 



Wings slightly tinged with yellow ; third and fourth veins nearly 

 parallel, fourth ending a little back of the apex of the wing; last 

 section of fifth vein 32, cross vein twenty-one fiftieths of a milli- 

 meter long. 



Female. — Almost like the male in color and form of wing; the 

 face is narrow and ocher yellow; the fifth abdominal segment is 

 similar to the fourth in color; ovipositor yellow with a black tip; 

 joints of posterior tarsi as 50-58-40-18-10; cilia of the calypters 

 more yellow than in the male. 



Described from three males and two females taken by Nathan 

 Banks at Barro Colorado Island, Panama Canal Zone; type, male, 

 taken July 22; female, allotype, taken August 2, 1924, the paratypes 

 were taken in June and July; also another female paratype was 

 taken by C. M. Eouillard at La Providencia, Siquinala, Guatemala, 

 this last is in the United States National Museum. 



Tiffe and allotype in the Museum of Comparative Zoology. 



Pam/y/?^.— Female, Cat. No. 41045, U.S.N.M. 



This is very much like signifer Aldrich, the male differs in the 

 form of the hypopygium, both sexes differ in having the disk of the 

 scutellum wholly bluish-green, except the margin, where the yellow 

 of the lower surface extends over the edge a very little. 



NEURIGONA MACULIPENNIS. new species 



Male. — ^Length 4 mm. Eyes almost touching, leaving a narrow 

 space above and below that is covered with grayish pollen; front 



