48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



white pollen on the sides of the segments; hypopygium of moderate 

 size, its lamellae oval, yellowish white, with a very narrow brown 

 border and pale hairs. 



Coxae, femora, and tibiae j^ellow; fore coxae with small black 

 hairs; fore tarsi with the first joint wholly brown, last three white, in 

 some lights more yellowish white, last joint a little darkened at tip, 

 third and fourth joints with white hair; middle and hind tarsi dark 

 brown; middle basitarsi with a row of little bristles below, which 

 have their tips bent; posterior basitarsi with one or two bristles 

 below near the base and one above at tip ; fore basitarsi with bristles 

 below, some of which are considerably longer than the diameter of the 

 joint; joints of fore tarsi as 24-11-8-6-6; of middle ones as 31-19- 

 16-11-8; joints of posterior pair as 26-35-25-18-8. Calypters and 

 halteres yellow, the former with black cilia. 



Wings grayish, a little darker in front ; costa not thickened ; third 

 vein nearly straight, only slightly bent backward at tip ; last section of 

 fourth vein bent just before basal third; beyond this bend it is slightly 

 arched, but nearly straight, approaching third to wing margin, which 

 it reaches distinctly before the apex of the wing. 



Described from two males; one, the tyfe taken by P. P. Calvert 

 March 4, 1910, at Cachi, Costa Rica, near Rio Reventazon, at 3,450 

 feet elevation; the furatyfe was taken by J, M. Aldrich May 1, 1926, 

 at Quirigua, Guatemala. 



ry;?e.— Male, Cat. No. 41057, U.S.N.M. 



This is very much like venustus Aldrich, but differs in having the 

 fore tarsi and their hairs partly white. 



PARACLIUS ARGENTIMANUS. new species 



Male. — Length 4 mm. Face narrow, wider below, brown when 

 seen from in front, yellowish when viewed from above; palpi and 

 proboscis brown ; front green, covered with silvery white pollen when 

 seen from the right angle; antennae black, third joint yellowish 

 brown, scarcely as long as wide, cut off nearly straight at tip, ari,sta 

 inserted at upper corner, pubescent ; lower orbital cilia white. 



Thorax green, dorsum with reddish coppery reflections; pleurae 

 and coxae covered with silvery white pollen and a curved line of the 

 same below the humeri; a large spot of white pollen at the suture, 

 which appears bluish in certain lights, and a small ,spot of white 

 pollen on each side of the scutellum ; abdominal segments blackish at 

 extreme base, then coppery, shading into bronze with the posterior 

 margins bluish ; sides of the segments with large spots of white pollen. 

 Hypopygium brownish black, large, not petiolate ; its lamellae nearly 

 round, moderately large, black, their hairs pale and their petioles 

 yellowish; inner appendages bristlelike, one pair arising from small 



