218 Mr. Edward Saunders on 



Andrena nu. 

 Head and thorax clothed with whitish hairs, those near the 

 insertion of the antennae mixed with darker ones, antennre with the 

 2nd joint of the flagellum 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 



\±J 



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

 puncturation ; propodeal ai'ea scarcely defined, very finely and not 

 reticulately rugulose, in this respect similar to its surroundings, 

 abdomen shining, very finely rugulose, and with a distinct 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. R 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 $ may belong to the $ described above as it has the 

 same finely rugulose propodeal area and a similai-ly sculptured 

 abdomen ; but from a single example amongst such closely allied 

 forms, it is difiicult to draw any satisfactory conclusion. 



Andrena, sp. ? (stylopized). 



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



$ 2. Algiers, 14 and 24, iii, 98. {F. B. M.) 



Being stylopized I have not endeavoured to refer these 

 to anv 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 distinguishable from any of the 

 above. 



