ART. 10 TROPICAL AMERICAN" DIPTERA — VAN DUZEE 27 



Thorax dull green, its pollen brown, leaving two indistinct vittae, 

 one each side of a narrow, median line of brown pollen, its bristles 

 long, black; pollen on the pleurae white. Abdomen green, some- 

 times the first and second segments appear blackish in certain lights; 

 base of the other segments broadly blackish purple on the middle of 

 the dorsum, but this color scarcely reaches the lower edge on the 

 sides; abdomen with numerous pale hairs. Hypopygium small, ita 

 appendages small, partly black and partly yellowish, sometimes 

 concealed. 



Fore coxae, all femora, fore and middle tibiae and most of anterior 

 tarsi pale yellow; fore coxae with conspicuous w'hite hair; fore and 

 middle coxae with yellow bristles at tip, posterior ones with one 

 erect, black bristles on outer surface ; middle and hind coxae greenish 

 -with yellow tips; upper edge of hind femora at tip and their tibiae 

 brown, the tibiae more yellowish on basal part; first three joints of 

 middle tarsi brown, fourth (fig. 33) whitish, widened, fifth black, 

 still broader, oval; hind tarsi wholly black; joints' of fore tarsi as 

 40-16-11-5-6; those of middle ones as 69-32-28-10-11; joints of pos- 

 terior pair as 58-32-29-14-8; calypters and halteres yellow, cilia of 

 the former pale yellow. 



Wings dark grayish ; second vein running rather close to the costa ; 

 third vein bent back toward its tip, then forward near the wing 

 margin; tip of fourth vein before the apex of the wing; last section 

 of fifth vein bowed backward in the middle, it is 55, cross vein 

 twenty-four fiftieths of a millimeter long; wing narrow at base, 

 wildest just back of the tip of fifth vein. 



Female. — Face a little wider than in the male; middle and hind 

 tibiae yellow with extreme tip brown or black; joints of posterior 

 tarsi as 45-32-21-11-10; fore coxae slightly darkened on basal half; 

 cilia of calypters appear black in certain lights, yellow when viewed 

 in other lights; wings broader, especially at base; anal angle quite 

 prominent; second vein running at the normal distance from the 

 costa ; third vein only bent back a little toward the tip ; fourth vein 

 ending in the apex of the wing; last section of fifth vein bent back- 

 ward at its middle as in the male. 



Described from four males and two females, taken October 24, 

 1926, at Angol, Chile, by D. S. Bullock. 



T^pe.— Male, Cat. No. 41040, U.S.N.M. 



SYMPYCNUS FILIFORMIS. new species 



Male. — Length 2.3 mm. Eyes contiguous-; palpi white; proboscis 

 broW'U; front black with brown pollen; antennae (fig. 34) yellow, 

 third joint brown, triangular, nearly twice as long as wnde. 



