1S83.] • 135 



slightly flatbened, witli segments deeply divided ; it is rather pugna- 

 ceous, discharging a reddish fluid from the mouth, with a threatening 

 action when touched. Colour pale slate-colour, with black spots on 

 the 3rd and -ith segments, and faintly whitish spots on the segments 

 behind these. When full grown, it is plump, tapering to each extre- 

 mity, of a whitish-grey ; sometimes tinged with bluish-greeu, head and 

 plates shining black ; the dorsal plate with a white collar, and some- 

 times edged with white behind ; legs black, claspers pale greenish, 

 dotted with black. Rolling up leaves of oak, elm, and other trees. 

 June. 



Pupa dark brown, in the rolled leaves. 



Zeller says of the larva : " blue-grey above, with four pale spots 

 on each segment, pale grey beneath, head, dorsal and anal plates black." 



Pembroke : l^Jth August, 1883. 



DESCRIPTIONS OF TWO NEW SPECIES OP BEITISH ACULEATE 

 SYMENOPTERA. 



BT EDWAKD SAUNDERS, F.L.S. 



The two species which I am about to describe, viz., Pompilus 

 unguicularis, Thoms., and Tacliytes lativalvis, Thorns., will probably be 

 found to exist in many localities when looked for, as they bear such a 

 close general resemblance to other allied species, that they have pro- 

 bably been hitherto confounded with them in this country. In 

 Pompilus especially, the general resemblance which the small red- 

 bodied species bear to one another is most perplexing, and yet the 

 structural characters will be found to be well defined, and can be 

 relied on with safety when once realized. The following short de- 

 scription will give the chief characteristics of the new species. 



PoMPiLUS UNGUicuLAKis, Thoms., Opusc. Eut., p. 221 ; Ilym. Scaud., 

 iii, p. 19i. 



Like all the otlier small red-bodied species in colour ; metathorax not pilose ; 

 prothorax sharply and angulately emarginate posteriorly ; third submarginal cell 

 sub-triangular ; anterior tarsi with long spines in the $ , posterior tibiae simple in 

 the $ ; ventral segments in the $ not longitudinally impressed, apical dorsal valve of 

 the $ finely pilose, clypeus in the $ with its anterior margin somewhat thickened, 

 and with a row of stiff bristles above it ; apical ventral valve in the $ flat, with a 

 distinct central carina widening towai-ds the base, and destitute of a pendant spine 

 or spine-like apical hairs. The spines between the claws of the tarsi in the ^ are 

 very long and curved, considerably passing the apex of the pulvillus, posterior-wings 

 with the cubital furcaturc situated some distance beyond the apex of the anal coll. 



