216 BRITISH BEES, 



10. Icevis, Kirby, ? . 4 lines. 

 W.fulvicornis, 'K.ixby, $. 4 lines. 



12. minuius, Kirby, c? ? • 2^-31 lines. 



13. nitidiusculus, Kirby, S ? • 2-3 lines. 



14. minutissimus, Kirby, ^ ? . 1^-21 lines. (Plate 



IV. fig. 3c??.) * 

 15.flavipes, Kirby, cJ ?. 3-4 lines. (Plate IV. fig. 

 2(??.) 

 seladonia, Kirby. 



16. Smeathmanellus, Kirby, $ ? . 2^-3^ lines. 



17. ceratus, Kirby, ^ ? . 2|-3 lines. 



18. leucopus, Kirby, <? ? . 3-3| lines. 



19. morio, Kirby, ^ $ . 2-2| lines. 



GENERAL OBSERVATIONS. 



This genus was named by Latreille from aXi^o), to 

 crowd, or collect together, from the fact of their nidifi- 

 cating in numbers on the same spot. 



The females closely resemble in form those of the 

 genus Andrena, but the males are very unlike both 

 those of that genus and their own females, for they all 

 have long cylindrical bodies and very long antennae, 

 much longer relatively than those of the former genus. 

 Although none of the species approach in size the larger 

 ones of the preceding genus, their extremes of specific 

 size are as distant apart as they are in that genus, the 

 smallest being extremely minute. Some of even the 

 commoner species are very pretty when in fine con- 

 dition, and several of them have a rich metallic green 

 or blue tint, and in the majority the wings are iridescent 

 with the brightest and gayest colours of the rainbow. 

 The numbers in which they associate together upon the 

 same spot varies considerably, and a very few indeed 



