274 HYMENOPTERA ACULEATA. 



mucli longer than any of the others, second and third joints 

 subequal, maxillary palpi six-jointed, paraglossas narrow, 

 their blades gradually narrowed to the apex, which ia 

 acute, tongue elongate, about eight times as long as its 

 ■width, lora not definite, the arch which represents them 

 being apparently formed of the thickened apex of the mem- 

 brane between the cardines, submentum subglobular, hya- 

 line, antenna; in the c? scarcely longer than in the J ; 

 wings with the marginal cell subtruncate at the apex, 

 and appendiculated, two submarginal cells. ^ with eight 

 ventral segments exposed, the eighth narrow and andreni- 

 form, genital armature very variable in shape, and affording 

 good specific characters ; posterior tibias in both sexes with 

 a basal patella ; 9 with a distinct apical fringe, and well 

 developed tibial scopas; metatarsi produced at the apex 

 outwardly. Our two species may be thus distinguished : — 



(2) 1. Smaller, $ with a large Hunt spine on the 

 posterior femora beneath ; $ with the sur- 

 face of the abJomen nearly glabrous . . calcaratus. 



(1) 2. Larger, (J posterior femora simple ; $, abdo- 

 men above clothed with erect hairs . . uhsinus. 



P. calcaratus, -Scop. ■^— Black, shining, sparingly clothed 

 ■with erect black hairs intermixed with grey, head in the c? 

 often very large ; antennfe more or less testaceous towards 

 the apex in both sexes, rarely entirely black, clypeus deeply 

 emarginate in front, especially in the $, labrum highly 

 polished, and centrally impressed ; mesonotum finely, re- 

 motely, and irregularly punctured, propodeum shining, im- 

 punctate, its basal area impressed, longitudinally striate ; 

 abdomen very finely punctured, its dorsal surface sparingly 

 clothed with black hairs in the $ , nearly glabrous in the 

 ?, apices of the segments deeply impressed in the $, 

 slightly in the ? , in both sexes subpiceous, apical fringe 

 sooty brown, sixth segment in the ? narrowly raised in 

 the centre ; segments beneath fringed with hairs at the 

 apex, the sixth in the $ narrowly emarginate in the centre. 



