94 H YMENOP TERA ACULEATA. 



L. 6-10 mm. 



Very common ; may bo bred freely from bramble stems. 

 I possess the type of this species from Shuckard's col- 

 lection. 



(Sqeg. CERATOPHORUS.) 



P. morio, F. d. Lind. {anthracinus, Smith). — Readily 

 distinguished from any of the preceding' by the slightly 

 raised sides of the face and its excavated centre, as well as 

 by the blunt process between the antenna), and the much 

 shorter petiole of the abdomen ; in the ^ the face is not 

 clothed with silvery hairs below the antennEB, and the 

 third, fourth, and fifth ventral segments of the abdomen 

 have a fringe of semi-erect hairs near the middle ; in the ? 

 the clypeus is semicircularly-emarginate, the emargination 

 simple, not toothed in the centre ; labrum widely chan- 

 nelled ; tibite neither spined nor toothed. 



L. 6-7 mm. 



Rare. London District ; Devonshire ; (Smitli). Batter- 

 sea Fields ; {Shucliard). Parley Heath ; (Dale). 



I have carefully examined the type of Smith's anthra- 

 cinus, kindly lent to me by Dr. P. B. Mason, and fail 

 to see any character in it of specific value. All the 

 females I have seen seem to agree with Thomson's 

 description of his carinatus, but the males with that of his 

 clypealis. 



DIODONTUS, Curt. 

 The species of this genus, with the exception of large 

 examples of tristis, are smaller than those of Pemphredoyi, 

 and may be known also by the much shorter petiole, the 

 abdomen being nearly sessile ; the labrum is produced and 

 emarginate at the apex ; the clypeus is tridentate in the ? , 

 bidentate and densely clothed with silvery hairs in the ^ ; 

 the wings have two submarginal cells, and the propodeum 

 is reticulately rugose ; the abdomen is oblong ovate, 



