2G6 [May. 



the apex of posterior tibiae and the apices of the joints of anterior tarsi black. Spurs 

 acutely pointed, about one-third of the length of metatarsus. 



The ^ has the antennae longer and tliicker ; the 3rd joint is shorter than the 

 4th ; the under-side of the body testaceous ; the tarsi are darker coloured, and there 

 is a short black line on the posterior femora above ; the last abdominal segment 

 keeled in the middle on upper-side. 



Length, 2^ lines. 



This species comes very close to i\r. lacteus. Thorns., from which 

 it differs in coloration only in the part immediately behind the 

 sutures on vertex being black in both sexes, while with Incteus, the 

 head is completely black behind, except perhaps at the extreme edge. 

 Otherwise, orhitalis differs from lacteus in having the front and vertex 

 punctured, the anteunfe, if anything, longer and lighter coloured, the 

 clypeus not so deeply incised, the recurrent nervure in hind-wings is 

 not interstitial ; and, lastly, the saw is very much narrower, and 

 differently toothed. 



The ^ differs from the same sex in lacteus, in having the antennae 

 longer, these being longer than the body, they are more densely pilose, 

 more slender, the last segment of abdomen is more distinctly keeled 

 above and beneath ; it is much broader at the apex, not being brought 

 to a point in the centre. In coloration it differs in having only a 

 longitudinal black mark under the wings, while the entire mesothorax 

 in lacteus is black. So far as I know, this is the only species of the 

 green section which has not the head entirely black behind. 



Eare. Cadder AVilderness ; Ballantrae, Ayrshire ; Germany. 

 The larva feeds on sallow. 



Nematus stlvesteis, n. sp. 



Green ; the vertex between the ocelli, a line in centre of middle lobe of meso- 

 notum at the base touching the pronotum, a longer line on inner side reaching from 

 near the pronotum to the scutellum ; a small round mark on either side of these at 

 apex, a larger mark outside of scutellum ; a curved line in front of each of the 

 cenchri ; and two or three narrow transverse marks at base of abdomen ; black. An- 

 tenna; as long as the body, a thin black line on upper surface ; 3rd joint shorter 

 than 4th, longer than the long diameter of the eye. Wings clear hyaline. Apices 

 of tarsal joints fuscous. Cerci short, thick. 



The $ has the antenna) as long as the body, densely covered with a close pile, 

 the 3rd joint a little curved ; blackish above, testaceous beneath. Vertex broadly 

 black, behind black, except at edges. Body greenish-testaceous beneath, meso- and 

 metanotum and abdomen above, except at extreme apex, and at the sides of the apical 

 segments, black. Apical segment of abdomen transverse at apex above ; rounded 

 beneath, with the edges incised. There is a short blunt keel above, which does not 

 reach to the apex, and with a depression on either side of it. Stigma griseous- 

 testaceous. The sides of scutellum are obscure testaceous. 



Length, 2% lines. 



