ABT. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 49 



tubercules; the central organ black, inserted at base of hypopygium 

 and equaling it in length. 



All coxae black with yellow tip,s and black hairs and bristles; all 

 femora, tibiae and the fore tarsi yellow, middle and hind tarsi brown 

 or black; posterior femora black on whole upper edge: upper edge 

 of fore tibiae flattened but not widened, silvery white, glabrous, with 

 two small bristles on anterior edge and three or four on posterior 

 edge, anterior surface with a narrow streak of silvery pollen on apical 

 half, posterior surface with one bristle on lower edge; middle tibiae 

 with two large bristles on lower anterior .surface and upper surface 

 with two rows of large bristles and a silvery pollinose streak between 

 them; posterior tibiae without a bristle below. Fore tarsi distincth^ 

 compressed, first joint widest, sides of all joints glabrous and silvery 

 pollinose; first joint of hind tarsi with a stout, but not large or erect, 

 bristle below near the base; joints of fore tarsi as 35-15-12-7-10; of 

 middle ones as 50-27-22-11-10; joints of hind tar,si as 37-42-28-15-11. 

 Calypters and halteres yellow, cilia of the former black. 



Wings slightly tinged with brown, posterior margin gray; costa 

 much thickened from the base of the wing, this thickening is a little 

 narrowed before the tip of first vein, where it is again increased and 

 from there tapering to its tip; third vein nearly straight; la.st section 

 of fourth vein bent almost at a right angle beyond its middle, then 

 arched so as to run quite close to and parallel with third vein for 

 half the distance from the bend to the wing margin, which it reaches 

 far before the apex of the wing; hind margin of wing distinctly 

 indented at tip of fifth vein; cross vein 24, last section of fifth vein 

 eighteen-fiftieths of a millimeter long. 



Described from one male taken by J. M. Aldrich, April 16, 1926, 

 at La Providencia, Obispo, Guatemala. 



Ti/pe.— Male, Cat. No. 41058, U.S.N.M. 



This is a very distinct species and can be recognized at once by the 

 enlargement of the costa from the root of the wing, the compressed 

 and silvery fore tarsi, black upper edge of posterior femora, and the 

 black hypopj^gial lamellae. 



PARACLIUS FRONTALIS, new species 



Male. — Length 3.2 mm. Face silvery white, long, nearly reaching 

 the lower margin of the eyes, narrow in the middle of upper portion, 

 the part below the transverse ridge about as wide as long, rounded 

 below; palpi and proboscis dark yellow; front bright shining green 

 m the middle, the sides with thick white pollen; antennae yellow, 

 third joint black at tip, about as long as wide, slightly rounded at 

 tip, arista vvith very short pubescence; lower orbital cilia white. 

 2613—28 4 



