MONOGKAPH OF THE NORTH AMERICAN rUOCTOTKYPID^E. 387 



POLYPEZA Forsttr. 

 Hym. Stud., ii, ]>. 123 (185fi). 



Head jjlobose, rounded before and behind, the occiput not margined; 

 ocelli 3, triangularly arranged; eyes rounded, pubescent. 



Antennae 14-.jointed, inserted on a frontal prominence; in ? sub- 

 moniliform, gradually incrassated toward tips; in ? filiform, the joints 

 cylindrical. 



Mandibles subrostriforni, bidentate. 



Maxillary i)alpi 3 jointed: labial palpi 2-jointod. 



Thorax ovate, narrowed into a short rounded collar anteriorly; mes- 

 onotuni with two furrows; scutellum rounded, convex, with a deep 

 fovea at base; nietiithorax with a central longitudinal carina. 



Front wings pubescent, ciliated, the subinarginal nervure reaching 

 the costa at about half its length, the marginal nervure distinct, post- 

 marginal and stigmal nervures very minute, scarcely developed ; basal 

 nervure distinct. 



Abdomen conic ovate, petiolated, the petiole as long as the metano- 

 turn ; ovipositor prominent. 



Legs clavate, pilose, the tarsi fully as long or longer than the tibise, 

 5-jointed, the basal Joint of hind tarsi fully 3 times as long as the second. 



This genus is the only one in the tribe with 14-.jointed antenuai iu 

 the $ and closely resembles a belytid, without a marginal cell. 



Polypeza Pergandei, sp. iiov. 

 (PI. XVI. Fijj. 2, 9.) 



S 9. Length, 1 to 1.2""". Polished black; metathorax, petiole, 

 and base and tip of abdomen dull rufous, or piceous. Antenna* in 9 

 14-jointed, submoniliform, gradually incrassated toward tips; pedicel 

 longer ami thicker than the tirst flagellar Joint; second and third 

 flagellar Joints shorter than the first, the Joints beyond monilifprm; 

 in S 14-Jointed, long, flhform, fuscous, the first flagellar Joint tUrice as 

 hmg a3 the jjedicel. 



Thorax with 2 distinct furrows; scutellum convex, with a deep de- 

 pression at base ; metathora short, smooth, but bounded by a carina 

 behind. Teguhe yellowish. Wings hyaline, pubescent, very broad, 

 and with a long fringe at the margins; the submarginal vein reaches 

 the costa a little before the middle of the wing; the marginal vein is 

 rather long, linear; stigmal vein short, with an uncus at tip and a 

 slight indication of a backward directed branch; basal cell distinct. 

 Legs honey-yellow, the femora and tibia* slightly infuscated. Abdo- 

 men conic-ovate, petiolated; the petiole twice as long as thick, stiiated; 

 the second segment occupies most of the remaining surface; segments 

 3 to 6 very short, the seventh conically pointed, longer than segments 

 3 to « united. 



Habitat. — Arlington, Va. 



Types iu Coll. Ashmead. 



