CILISSA. 213 



less distinctly geniculated, the flagellum taking a sweep- 

 ing curve, the face and clypeus much more pubescent, 

 but the leys sexually less so ; the sexes are much alike. 



NATIVE SPECIES. 



1. tricincta, Kirby, <? ? . 5 lines. (Plate V.fig. 1 c? ? .) 

 ? Apis leporina, Panzer. 



2. hamorrhoidalis, Fab. <^ ? . 

 hcemorrhoidalis chrysura, Kirby. 



GENERAL OBSERVATIONS. 



This genus has been named without any reference to 

 any peculiarity, Dr. Leach having applied a Proper name 

 to it to designate it. 



The Cilissa tricincta is perhaps most like the larger 

 species of the genus Colletes, both in markings and in 

 the form of the body, but in resemblance of form the se- 

 cond species participates. Although robust insects, and 

 as large as the larger Andrence, they are yet unprovided 

 with the same ample means for conveying pollen, being 

 destitute of the lock of hair upon the posterior trochan- 

 ters and the sides of the metathorax are less densely pu- 

 bescent. The ground colour is brown. Their economy 

 is assumed to resemble that of Andrena, although it has 

 not been so closely investigated ; for my own part I have 

 never had the opportunity of tracing it to its nidus, hav- 

 ing always captured the species upon flowers. They are 

 fond of the trefoil (Trifolium repens), and the C. chrysura 

 frequents the Campanula rotundifolia, as well as the 

 flowers of the throatwort (Trachelium}. In their excur- 

 sions they are usually accompanied by their males. Both 

 species are found in the south and west of England. 



