28 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



Thorax green with thick yellowish brown pollen; humeri, edge 

 of scutellum and more or less of the margins of the dorsum reddish 

 yellow; pleurae Jargely yellow. Abdomen brown, venter and basal 

 half of second segment yellow. Hypopygium (fig. 35) rather 

 large, black with long yellow filamentlike appendages extending for- 

 ward under the abdomen and reaching nearly to its base; these are 

 fringed with long hairs. 



Coxae, femora, and tibiae pale yejlow ; posterior femora and tibiae 

 darker yellow ; fore coxae with several black bristles at tip ; femora 

 nearly bare below; bristles of middle and hind tibiae very small; 

 tarsi black from the tip of the first joint; fore tarsi (fig. 36) with the 

 second joint swollen below on basal half and with long, bristly, black 

 hairs on upper apical part of the joints; fore tibiae as 50; joints of 

 fore tarsi as 26-14-11-7-9; those of middle tarsi as 38-18-16-9-6; 

 joints of posterior pair as 19-25-19-10-8. Halteres yellow; cilia of 

 the calypters black. 



Wings grayish ; third and fourth veins nearly parallel, third bent 

 back a little near the tip, fourth ending in the apex of the wing; 

 last section of fifth vein 24, cross vein fourteen-fiftieths of a milli- 

 meter long ; anal angle of wing not at all prominent, the wing being 

 narrowed at base. 



Described from one male, taken by J. M. Aldrich, May 1, 1926, at 

 El Sa^to, Antigua, Guatemala. 



Type.— Male, Cat. No. 41042, U.S.N.M. 



SYMPYCNUS BIPILUS. nsw species 



Male. — Length 2 mm. Eyes contiguous, leaving a narrow whitish 

 triangle below the antennae; palpi whitish; front black with gray 

 pollen; antennae (fig. 37) yellow, third joint brown at tip, about as 

 long as wide, somewhat triangular. 



Thorax green, color obscured by brown pollen, which forms indis- 

 tinct vittae; abdomen black; hypopygium small, lamellae small, 

 yellow. 



Coxae, femora and tibiae yellow, posterior femora blackish above; 

 femora nearly bare below ; posterior tibiae with only very short bris- 

 tles, those on middle tibiae longer ; fore and middle tarsi inf uscated 

 from the tip of the first joint; posterior tarsi (fig. 38) mostly black, 

 second joint with two long white hairs at tip below, which are longer 

 than the joint and extend backward ; fore tibiae as 45 ; joints of fore 

 tarsi as 16-4-4-3-5 ; joints of middle ones as 29-12-12-6-6 ; those of 

 posterior pair as 19-13-15-13-10, hairs at tip of second joint as 15. 



Wings uniformly tinged with brown; third and fourth veins par- 

 allel, fourth ending in the apex of the wing ; last section of fifth vein 



