1908.] AUSTRALIAN FOSSORIAL WASPS. 517 



with the longitudinal sulcus below the base of the wings much 

 more feebly marked than in P. erythrocerum Kohl. 



Black ; the tegulpe fuscous. Wings hyaline, faintly clouded at 

 the apex ; nervui'es fuscous. 



Length 7 mm. 



Hah. Mackay, Queensland [Turner) ; February. 



The pronotum is shaped as in erythrocerum Kohl, but more 

 strongly narrowed anteriorly, and much less depressed than in 

 other species. 



PisoN (Parapison) pertinax, sp. n. 



5 . Head and thorax opaque, not visibly punctured, a short and 

 obscure longitudinal sulcus below the anterior ocellus. Clypeus 

 short, fully twice as broad as long, convex, veiy broadly rounded 

 antei'iorly, and covered with short silvery pubescence. Antennse 

 a little longer than the head, inserted at the base of the clypeus, 

 nearly half as far again from each other as from the eyes ; the 

 scape short, scarcely longer than the second joint of the flagellum, 

 which is about half as long again as the first or third ; the first 

 joint is stout and equal in length to the third. Eyes narrowly 

 emarginate, the depth of the emargination about equal to the 

 length of the first joint of the flagellum ; the distance between the 

 eyes on the vertex equal to about three-quarters of the distance 

 between them at the base of the clypeus. The posterior ocelli a 

 little nearer to the eyes than to each other, situated very near to 

 the posterior margin of the head, which is slightly transversely 

 raised behind them. Pronotum short and strongly depressed 

 anteriorly, the posterior margin sti'aight; scutellum broadly 

 truncate at the apex. Median segment rather slender, much 

 longer than broad, a little longer than the mesonotum, delicately 

 obliqviely striated, a caiina from the base to the apex lying in a 

 depressed sulcus, the latei-al margins of the segment mai-ked by a 

 carina ; narrowed posteriorly and abruptly truncated, the surface 

 of the truncation transversely striated, with a deep median sulcus. 

 Abdomen as long as the thorax and median segment combined, 

 shining; the apical margins of the segments depressed, most broadly 

 in the middle, the second segment constricted at the base, longer 

 and broader than the first or third. 



Black ; the mandibles, antennae (except the two apical joints), 

 tibite, tarsi, and abdomen (except the middle of the third segment) 

 ferruginous. Wings hyaline, iridescent ; nervures black. 



The first recurrent nervure is received by the first cubital cell 

 beyond two-thirds from the base, the second at the extreme base 

 of the second cubital cell, which is almost pointed on the radial 

 nei'vure, being less than a quarter of the length of the cell on the 

 •cubital nervure. 



Length 7 mm. 



Rah. Mackay, Queensland {Turner) ; January to May. 



Li some specimens the abdomen is wholly ferruginous. 



