1862. ] PECTEN IN CERTAIN SPECIES OF BEES. 119 
In some, as Andrena nitida, Q (figs. 3, 4), the direction of the 
teeth is reversed in the course of the row. The row of hairs is 
3 
figured by Kirby in his work on ‘ British Bees,’ at t. 1. f. 4 e, and 
called by him, in the explanation of the plates at page 226, “ sete 
rigidiuscule ;”’ but I do not find any mention of them in any other 
part of the work. 
In the Apide it is invariably at the upper part of the lower joint 
