N^OTES ON HYMENOPTERA. 105 



thorax, subrotund, very convex in front ; antennae shorter than 

 the thorax, not reaching beyond the insertion of the wings and 

 more incrassate than in the genus Pompilus; the tips of the 

 mandibles rufo-piceous and bidentate. Thorax as long as 

 the abdomen, the disk very convex; the metathorax with a 

 central longitudinal channel, which extends to the verge of 

 the posterior inclination; the sides and the apical portion 

 covered with silvery pile; the anterior wings with a dark 

 fuscous cloud at their apex beyond the second submarginal 

 cell; the posterior femora compressed; ferruginous within. 

 Abdomen : the base covered with silvery pile. 



This insect may eventually prove to be a variety of the 

 male of A. tniicolo?-, but until the other sex is found in the 

 locality where the female occurred this cannot be satisfac- 

 torily determined. A. fevioralis differs in having the meta- 

 thorax less inclined above, in having the legs less spinose, 

 and in having the posterior femora red within. 



Taken on the summit of High Peak near Sidmouth. 



Andrena vitrea. 



Female. Length 6 lines. Black : the pubescence on the 

 face fuscous, brightest at the sides of the clypeus, that on the 

 cheeks, the fringe behind the vertex is pale fulvous; the 

 thorax is clothed with a similar pubescence, being palest at 

 the sides of the metathorax and beneath ; the wings hyaline 

 and iridescent, the nervures pale ferruginous; the tegular 

 nigro-piceous ; the posterior tibiae have a clothing of bright 

 pale-fulvous pubescence ; the floccus on the coxag very pale 

 fulvous. Abdomen ovate, the segments thinly fringed with 

 pale pubescence ; the apical fimbria dark fuscous. 



Male. Length 4 — 5 lines. The colour and pubescence 

 on the head and thorax as in the female, but on the face it is 

 somewhat darker, inclining to black ; wings as in the female; 



