ART. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 55 



and inferior orbital cilia whitish, rather long, about four of the 

 upper cilia on each side black, two hairs or bristles next to the 

 proboscis black. 



Thorax <^vcen with violet reflections; the stripe of silvery white 

 pollen extending from the base of the wings to the front of thorax 

 is wide at the suture, narrow in front. Abdomen green, each seg- 

 ment with a black posterior border and a spot of white pollen on 

 each side; hairs and bristles of thorax and abdomen black, Hypo- 

 pygium black, its lamellae (fig. G8) triangular, black with a yellow 

 stem, fringed with pale hairs on outer edge and black, clavate bristles 

 on apical margin. 



Coxae black with black hair and bristles and yellow tips; femora 

 and tibiae yellow, knees and tips of tibiae of posterior legs infus- 

 cated; tarsi black, only a little yelloAvish at base; middle tarsi with 

 the usual bend between the second and third joints rather small; 

 joints of anterior tarsi as 40-13-12-8-12; of middle ones as 

 61-32-16-13-14; joints of posterior pair as 46-49-31-19-18. Calyp- 

 ters brown with apical half black, their cilia normal, rather long, 

 black; halteres yellow. 



Wings (fig. 69) tinged with brown in front of fifth vein to cross 

 vein, beyond that to fourth vein, hind margin of wing more gray; 

 last section of fourth vein bent at basal third; first section of 

 costa thickened a little on basal portion to a narrow break in the 

 thickening; beyond this break it is much thickened, tapering to 

 the tip. 



Female. — Colored as in the male, except that the bases of the calyp- 

 ters are more yellow; face reaching a little below the eyes, rounded 

 below ; palpi reaching a little below the face ; venation as in the male ; 

 wings not quite as brown. 



Described from three males and three females taken by J. M. 

 Aldrich, May 1, 1926, at El Salto, Antigua, Guatemala ; all paratypes 

 and the allotype were taken at the same time and place. 



Type.— Male, Cat. No. 41064, U.S.N.M. 



POLYMEDON RUBIGINOSUS. new species 



Female. — Length 4 mm. Face white, more yellowish on upper 

 portion, ending in an obtuse point a little below the eyes; fropt 

 green, opaque with gray pollen in certain lights; palpi brown; 

 proboscis largely white with yellow hairs ; lower orbital cilia whitish. 



Thorax and scutellum blue-green, the latter with a coppery spot 

 on each side, dorsum of tliorax covered with rather abundant brown 

 pollen, which is very conspicuous when viewed from in front; a 

 velvety black stripe above the root of the wing and a silvery stripe 

 from the wing to the humeri, both conspicuous when viewed from 

 the right direction. Abdomen blue-green, with obscure black pos- 



