genera and species of Hymenoptera. 195 



of saw large, projecting, covered with a dense pube- 

 scence ; the extreme apex of abdomen above dirty white ; 

 cerci small ; the 3rd cubital cellule is a little longer than 

 broad ; the transverse median nervure is received nearly 

 in the middle of the cellule ; the wings are large, being 

 longer than the body. Length, If lines. 



Agrees closest with N. scoticus, but is smaller, has the 

 antennae quite black, longer and thinner, the sutures on 

 vertex less deep, the mesonotum much more strongly 

 punctured. From the species of the mollis group, with 

 punctured mesonotum (see Trans. Ent. Soc. Lond., 1882, 

 p. 531), it may easily be known by its smaller size, 

 fuscous black stigma, longer and thinner antennae, shorter 

 and blacker cerci. 



Hab. Mickleham, in May (Mr. T. E. Billups). 



Acropiesta ? nigriceps, n. s. 



Testaceous ; head black ; thorax darker than abdomen, 

 covered sparingly with longish white hairs. The antenna? 

 are as long as the thorax and abdomen ; the 2nd joint is 

 half the length of the 3rd, which is thinner than it ; the 

 4th, 5th, and 6th are shorter and thicker than the 2nd, 

 but thinner than the succeeding, which are broader than 

 long, truncated at the apex, and lounded at the base; 

 the last conical, truncated at base, and longer than the 

 preceding. Sutures of mesonotum moderately deep, 

 issuing from a roundish wide fovea at base of scutellum. 

 Metathorax ending in a stout blunt spine at each side : 

 there is a ridge in the centre which bifurcates imme- 

 diately before the apex, each fork proceeding along to 

 the side. Petiole longer than broad, of uniform thick- 

 ness, as long as the metathorax : there is a slight ridge 

 at each side. Abdomen wider and longer than the 

 thorax ; the apical half is sharply contracted to a sharp 

 point ; the 7th segment is as long as the 3rd, 4th, 5th, 

 and 6th together. Wings narrow, not longer than the 

 abdomen. Length, 3 mm. 



This may not be an Acropiesta, as that genus is said 

 to have the last antennal joint " etwas keulformig 

 verdickt," the first eight longer than broad, the four 

 following broader than long, and the last is as long as 

 the two preceding, which is not the case with the species 

 I have described. I should have placed it in Belyta, as 

 denned by Forster, if that genus had not the keel cleft 



