MONOGRAPH OF THE NORTH AMERICAN PKOCTOTRYPID.E. 437 



Autenujb inserted on si slight frontal prominence; in 9 12-jointed, tiie 

 pedicel always much lar}»er and stouter than the first funiclar joint, 

 the first funiclar joint only a little lonj;er than wide, the .'i or 4 term- 

 inal joints enlarjjed, forming a club; in S 14-jointed, filiform-moniliform, 

 finely pubescent, the first and second funiclar joints elongated, about 

 equal or the second very slightly the shorter. 



Maxillary palpi (?). , 



Mandibles short, bifid. 



Thorax ovoid, the prothorax short, woolly; mesonotum smooth, with- 

 out furrows ; scutellum subconvex, rounded behind, without a trace of 

 the lateral impressed lines or a fovea at base ; metathorax short, woolly. 



Front wings pubescent, strongly ciliated, the submarginal vein 

 terminating in a punctiform marginal vein at about one-third the length 

 of the wing; no other veins; occasionally apterous. 



Abdomen oval, slightly pointed at tip, the petiole short, woolly, the 

 second segment occui)ying most of the surface, the foHowing segments 

 very short. 



Legs clavate, pilose or pubescent, the basal joint of iM)sterior tarsi 

 twice as long as the second. 



This genus is readily distinguished from all other genera in the 

 Diapriina;, except Monelata Forster, by the non-foveated scutellum, and 

 from Monelata, which also has no fovea at the base of the scutellum, 

 by having 12-jointed, not 13-jointed, antennae. 



The species are all very small, and evidently parasitic on Muscid 

 larva;, P. hwmatobiw, having been reared by Dr. Kiley from the Horn- 

 fly, Hwmatohia serrata. 



Our species may be distinguished by the aid of the following table : 



TABLE OF SPECIES. 



FEMALES. 



Wingless forms 3 



Winged. , 



Antennae with a 4-jointed club 2 



Antennaj with a 3-jointed club, the last joint of which is enlarged, ovate. 

 AntenntB black or brown-black, funiclar joints moniliforni,not longer than thick. 



Legs rufous, the coxse, femora, and tibite fuscous.. P. minutissima, sji. nov. 



Legs entirely reddish-yellow P. h^kmatobi.e, sp. nov. 



AntennjB reddish-yellow, the club black. 



Legs reddish-yellow P. virginica, sp. nov. 



2. Club black or fuscous. 



Legs yellow or reddish-yellow. 

 All the funiclar joints at least twice as long as thick.. .P. Schwarzii, sp. nov. 



3. AntenuiB black or brown-black, gradually incrassated. 



Legs rufo-piceous, the trochanters, base of tibiae, and tarsi pale. 



Abdomen long-oval, 2| times as wide as the thorax P. aptera, sp. nov. 



Antennte reddish-yellow, with a distinct 4-jointed black club. 

 Legs reddish-yellow. 



Abdomen long-oval, only twice as wide as the thorax P. affinis, sp. nov. 



