ART. 10 TROPICAL AMERICAN DIPTERA VAN" DUZEE 21 



vein running closer to second vein and extending nearer to the apex 

 of the wing, and the cross vein farther from the base of the wing. 



Genus CHRYSOTUS Meigen 



Chrysotus Meigen, Syst. Besclir., vol. 4, 1824, p. 40. — Loew, Monographs, 

 vol. 2, 1864, p. 171.— Aldrich, Kansas Univ. Sci. Bull., vol. 1, 1902, 

 pp. 85, 88.— Van Duzee, Bull. Bulfalo Soc. Nat. Sci., vol. 13, 1924, p. I, 

 revision with key. 



CHRYSOTUS CONTRACTUS, new species 



Male. — Length 2.5 mm. Face green, quite wide above, narrow 

 below; palpi yellow, proboscis black; front green; antennae wholly 

 black, formed as in hai'hatus Loew, third joint with a somewhat 

 globular base, then suddenly contracting into a long slender point, at 

 tip of which is the arista, which is scarcely as long as the narrow 

 part of third joint; lower orbital cilia and beard long, white. 



Thorax and abdomen bright green, dorsum of thorax with thin 

 brown pollen; hairs of the abdomen black, but appearing reddish- 

 yellow in certain lights; hypopygium small, its hairs yellow, it has 

 small, 3^ellowish lamellae projecting downward. 



Coxae black, anterior pair more green with yellow tips and white 

 hair; trochanters yellow; femora green, apical third of anterior and 

 apical half of middle pair yellow; posterior femora with a cluster 

 of long black hairs or bristles near the middle of anterior surface of 

 lower edge and two bristles near the tip; tibiae yellow, broad base 

 and narrow tip of posterior pair blackened, anterior pair with apical 

 half more or less infuscated; middle tibiae (fig. 54) swollen below at 

 the middle, then narrowed and again a little wider, this part appear- 

 ing about normal, they have a large bristle above near basal third 

 and two rows of very small spines below ; all tarsi blackish from the 

 tip of the first joint; middle basitarsus (fig. 54) arched and enlarged 

 at base and tip, it also has a continuation of the two rows of little 

 spines on lower surface, but they are very small, except at base and 

 tip; fore tibiae and basitarsus also have two rows of minute incon- 

 spicuous spines below; joints of fore tarsi as 18-7-5 4 4 ; those of 

 middle ones as 25-12-9-5-5 ; those of posterior tarsi as 22-1^^7-5-5. 

 Calypters, their cilia and the halteres yellow. 



Wings slightly grayish; third and fourth veins parallel, fourth end- 

 ing in the apex of the wing; cross vein nearly at the middle of the 

 wing ; first vein reaching scarcely beyond basal fourth of wing ; last 

 section of fifth vein 18, cross vein twelve-fiftieths of a millimeter long. 



Female. — Face and palpi about as in the male ; third antennal joint 

 small, about as long as wide, rounded at tip; arista apical, normal; 

 thorax and its pollen as in the male; cilia of the calypters black; 



