British Hymenoptera. 245 



(? . Head and thorax densely clothed with cinereous 

 hairs, those of the face white. Antennae reaching 

 to the sciitellum. Thorax with an indistinct transverse 

 line of black hairs between the wings. Abdomen shining, 

 blue-black ; 2nd and following segments impressed along 

 the apex ; 1st segment, and 2nd segment as far as the 

 apical impression, finely punctured and clothed with grey 

 hairs ; remaining segments punctured, except on their 

 apical impressions, and clothed with short black hairs ; 

 sides and apex with a few long white hairs ; segments 

 beneath fringed with long white hairs ; tibiae clothed with 

 black hairs. 



? . Face and thorax with greyish white hairs ; a 

 wide black central transverse band on "the latter. Ab- 

 domen ovate, somewhat shining, blue-black, very finely 

 punctured; apical fringe black. Legs densely clothed 

 with black hairs, except the front femora, which are 

 fringed with white hairs. Segments beneath fringed 

 with black hairs, having a few white ones towards each 

 side. Length 11 — 14 mm. 



Hab. Not uncommon, and widely distributed. Abun- 

 dantly distinct from all our other species. 



12. Andrena thoracica, Fab. 



Fab., Ent. Syst. ii., p. 328 ; Smith, Cat. Brit. Hym., 

 2nd ed., p. 34. 



Head clothed with black hairs. Thorax with bright 

 fulvous-brown hairs above, black beneath. Abdomen 

 black, shining, clothed above and beneath, as also the 

 legs, with black hairs. 



(? . Vertex of the head rugosely punctured, and 

 clothed along its posterior margin with brown hairs. 

 Antennae reaching to about the scutellum. Thorax 

 rugosely punctured, but the hairs are so dense that it is 

 difficult to see the actual surface. Abdomen very shining 

 and finely punctured, the 2nd and following segments 

 impressed along the apex ; surface clothed with, short 

 black hairs ; apex of abdomen and segments beneath 

 fringed with long black hairs, segments impressed at 

 the base. Legs with black hairs. 



? only differs from the c? in the stout build and usual 

 sexual characters, short antennae, in having the 1st and 

 2nd abdominal segments glabrous and more finely punc- 

 tured and the segments beneath not impressed at the base. 



