56 PROCEEDI]SrGS OF THE NATIOISTAX, MUSEUM vol.74 



terior margins to the segments and small spots of white pollen on the 

 sides. 



Fore coxae wholly yellow, with conspicuous black hair on anterior 

 surface and black bristles at tip ; middle and hind coxae black, with 

 their tips narrowly yellowish ; femora and tibiae yellow, posterior 

 tibiae narrowly black at tip ; middle tibiae with a row of bristle-like 

 hairs on lower anterior edge, these hairs are not as long as diameter 

 of the tibia ; fore and middle tarsi black from the tip of the first 

 joint; posterior tarsi almost wholly black; joints of fore tarsi as 

 43-13-12-8-11 ; of middle ones as 54-28-20-12-12; joints of posterior 

 tarsi as 44-44-27-10-14. 



Wings (fig. 70) grayish; last section of fourth vein much bent at 

 its middle, its tip before the apex of the wing; last section of fifth 

 vein scarcely as long as the cross vein ; third vein only very little 

 bent back at tip ; sixth vein rather long, nearly straight, tapering to 

 a point at tip. 



Described from a single female taken by J. M. Aldrich, May 25, 

 1926, at Tamau, Alta Vera Paz, Guatemala. 



Type.— Female, Cat. No. 41065, U.S.N.M. 



POLYMEDON NOTATUS, new species 



Male. — Length 4 mm. Face silvery white, one-fourth the width of 

 the head, nearly flat, reaching down to the lower margin of the eyes, 

 its sides nearly parallel, lower edge rounded; front covered with 

 silvery white pollen, a little wider than the face ; palpi and proboscis 

 black; occiput black, when viewed from the rear it shows two large, 

 conspicuous spots of white pollen separated by the black ocellar 

 tubercle; antennae wholly black, third joint a little longer than 

 wide, somewhat conical in outline; arista black, pubescent, rather 

 thick, one-fourth longer than the antenna; orbital cilia yellowish 

 white below. 



Dorsum of thorax dark shining green with a large spot of silvery 

 white pollen at the suture; scutellum a little more coppery; pleurae 

 and coxae covered with thin silvery white pollen; abdomen black 

 with slight green reflections, dulled with white pollen and with spots 

 of the same on the sides of the segments, Hypopygium black, its 

 outer lamellae black, rather large, somewhat round in outline with a 

 short petiole, they have a fringe of long black hairs on the edge, 

 which are somewhat concentric with the lamellae ; the inner append- 

 ages are a pair of black, hooked organs and two pairs of yellow 

 bristles; the central organ is inserted at the base of the hypopygium 

 and with its sheath is black at base, suddenly narrowed, shari^ly 

 pointed at tip, pale yellow from near the middle, very slender and 

 reaching a little beyond the end of the hypopygium. 



