218 Mr. Edward Saunders on 



Andrena nu. 



Head and tliorax clothed with whitish hairs, those near the 

 insertion of the antennic mixed with darker ones, antenna? with the 

 2nd joint of the flayellum much longer than either the 3rd or 4th 

 which are subequal and much wider than long. The following joints 

 are all more or less transverse with the exception of the 11th 



and 12th, mesonotum finely rugulose and with a distinct remote 

 puncturation ; propodeal area scarcely defined, very finely and not 

 reticulately rugulose, in this respect similar to its surroundings, 

 abdomen shining, very finely rugulose, and with a distinc-t very fine 

 but not very distant puncturation, apices of the segments not dis- 

 coloured, smoother than the discs, but scarcely impressed. 



$ 3. Algiers, 17, iii to 19, iv, 98. (F. D. M.) 



This species closely resembles the former in the shape of the 

 armature but is quite distinct in sculpture and in the very unusual, 

 somewhat triangular, form of the 8th ventral segment. 



Andrena, sp. ? 



This 9 raa^y belong to the $ described above as it has the 

 same finely rugulose propodeal area and a similarly sculptured 

 abdomen ; but from a single example amongst such closely allied 

 forms, it is difficult to draw any satisfactory conclusion. 



Andrena, sp. ? (stylojnzed). 



$ 1. Algiers, 28, iv, 98. (F. D. M.) 



? 2. Algiers, 14 and 24, iii, 98. {F. D. M.) 



Being stylopized I have not endeavoured to refer these 

 to any of the above species as their characters are liable 

 to have been modified by the presence of the parasites. 



Andrena omicron. 



A short very rugose species easily distiiiguishaljle from any of the 

 above. 



