, ANDRENA. 201 



and the terminal segment having a triangular central 

 plate, its sides rigidly setose. 



The MALE differs in having the head rather wider than 

 the thorax, the vertex where the oeelli are placed more 

 ])rotuberant, the mandibles very large and more acutely 

 bidentate, sometimes largely forcipate and with but one 

 acute tooth ; the males in most species greatly differ 

 from their females. 



None of these insects exhibit any positive colouring of 

 the integument, excepting in some upon the abdomen, 

 which exhibits red bands, and is disposed to vary con- 

 siderably in intensity and breadth, and in some the 

 clypeus and /ace are of a cream-colour, but which occurs 

 chiefly among the males. They are very dissimilar in 

 general appearance, some being densely pubescent all 

 over, others merelv so on the head and thorax; others 

 are banded with white decumbent down, and some are 

 wholly unmarked upon the abdomen. These pecu- 

 liarities help to group them, and thus facilitate their 

 recognition. 



NATIVE SPECIES. 



§ Banded with red on the ahdomen, the segments of whitili are more or 

 less fringed. 



1. Hattorfiana, Fab., $ ? . 6-7 lines. 

 Lathamana, Kirby, ? . 

 hamorrhoidalis, Kirby, ? . 



2. zonalis, Kirby, $ ? . 44-5 lines. 



3. florea, Fabricius, ^ ? , 5-6| lines. 

 RoscB, Kirby, var. 



4. Rosa, Panzer, J ? . 4-6 lines. (Plate III. fig. 



Ros(B, Kirby, ? . 



