AET. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 51 



joints of posterior pair as 31-38-27-19. Calypters and halteres 

 j'ellow, the former with black cilia. 



Wings gray; costa without thickening; third vein bent back at 

 tip; last section of fourth vein bent before its middle, gently arched 

 so as to approach third at tip, not or scarcely parallel with third at 

 tip, reaching the wing margin just before the apex of the wing; 

 last section of fifth vein 18, cross vein sixteen-fiftieths of a milli- 

 meter long. 



Described from one male taken by J. M. Aldrich, May, 192G, at 

 Antigua, Guatemala. 



Type.—U'Ala, Cat. No. 41060, U.S.N.M. 



This is very much like venustus Aldrich in size, color, and form of 

 hypopygial lamellae, but differs in having the middle tarsi orna- 

 mented. 



PARACLIUS ACUTICORNIS, new species 



Male. — Length, 3 mm. Face wide above, narrow below, covered 

 with white pollen; palpi yellowish brown; antennae (fig. 59) yel- 

 low, the point and arista brownish, basal part of third joint nearly 

 square with a long slender point extending from the middle, this is 

 nearly as long as the basal portion; arista with long pubescence; 

 front blue-green, almost without pollen; lateral and inferior orbital 

 cilia whitish. 



Dorsum of thorax blue with violet reflections and a little gray 

 pollen; humeri a little yellowish; the velvety black stripe above the 

 root of the wing distinct and reaching the suture, in front of which 

 is a white pollinose spot, which reaches the humeri. Abdomen bright 

 green with black hair and spots of white pollen on the sides of the 

 segments; hypopygium yellowish brown; lamellae yellow at base, 

 more brown apically, of moderate size. 



Coxae, femora, tibiae, and fore tarsi wholly yellow, with short 

 but very conspicuous black hair; middle and hind tarsi brown from 

 the tip of the first joint; first joint of all tarsi have little spines 

 below; joints of fore tarsi as 33-10-6-6-6; of middle pair as 

 44-24-19-13-8 ; joints of posterior tarsi as 26-41-23-1^8. Calypters, 

 their cilia and the halteres yellow. 



Wings grayish ; first section of costa not at all thickened ; last sec- 

 tion of fourth vein with an abrupt curve forward near its middle, 

 then arched so that its tip is near the tip of third vein and only a 

 little in front of the apex of the wing; third vein only a very little 

 bent backward at tip ; last section of fifth vein 22, cross vein twenty- 

 one fiftieths of a millimeter long. 



Feinale. — Face about as wide as in the male, mostly green; an- 

 tennae (fig. 60) smaller, the point at tip more obtuse and placed 

 near lower corner; thorax blue-green, shining, humeri more yellow; 



