ART. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 45 



PARACLIUS ALDRICHI. new species 



Male. — Length 4 mm. Face golden yellow, reaching the lower mar- 

 gin of the eyes, narrow in the middle, wider below, the portion below 

 the suture a little longer than wide, lower edge rounded; palpi and 

 proboscis black with miniite pale hairs; antennae yellow with a black 

 spot at base of arista, third joint somewhat conical, slightly longer 

 than wide; front blue-green with yellowish pollen; orbital cilia 

 wholly black. 



Thorax blue-green, anterior part of dorsum co^'ered with yellow- 

 ish-brown pollen, posterior part shining; pleurae with silvery white 

 pollen ; the pollen at the transverse suture is yellowish white, above 

 the root of the wing there is a nearly round spot of white pollen. 

 Abdomen dark green, posterior margins of segments more blue- 

 black, segments with large spots of white pollen on their sides. 

 Hypopygium aiid its lamellae black, petiole of the latter yellow at 

 base; lamellae formed about as in subpuhescens Becker, they are 

 broader than long, somewhat rectangular in outline with the basal 

 corner rounded, with delicate pale hairs and a few stouter black 

 bristles near the tip ; inner appendages small, pale yellow. 



The whole of fore coxae, tips of middle ones, most of posterior 

 coxae, and all femora and tibiae yellow ; fore coxae with small black 

 hair on anterior surface and several bristles on apical half of outer 

 edge; fore tibiae formed about as in fusiformis Becker (fig. 57), but 

 more narrowed at base, flattened and much widened on apical two- 

 thirds, upper surface glabrous and silvery white, this glabrous area 

 extends to the base but becomes more yellow and very narrow. The 

 tibiae have a bristle on each edge near the middle ; the anterior sur- 

 face is also a little flattened, glabrous and white poUinose on apical 

 two-thirds; middle tibiae with two large bristles below, posterior pair 

 black at tip on inner surface; fore tarsi with most of first joint 

 yellow; middle and hind tarsi blackish, more or less yellow at base; 

 length of fore tibiae as 67, width at widest part, which is near apical 

 third, as 16; joints of fore tarsi as 40-13-1O-7-9 ; joints of middle 

 tarsi as 49-27-21-13-11 ; those of posterior ones as 42-43-27-17-14. 

 Calypters and halteres yellow, cilia of the former black. 



Wings tinged with brownish gray; third vein nearly straight; last 

 section of fourth vein sharply bent near its middle, then arched so 

 that its apical fourth runs parallel with third vein, its tip before the 

 apex of the wing ; cross vein 28, last section of fifth vein tAventy-foui' 

 fiftieths of a millimeter long. 



Female. — Wings and general color about as in the male; antennae 

 black on the upper half; face a little wider than in the male, whitish, 

 strongly tinged with yellow, sometimes almost brownish yellow; color 



