1 664 Insects. 



cies I have at various times taken in coitu, — Andrena albicans, ni- 

 tida, tibialis, fulva, Clarkella, fulvicrus, labialis, chrysosceles, albicrus, 

 fulvescens, and argentipes ; and this had enabled me to unite several 

 not previously ascertained. I have also carefully observed the times 

 of appearance of a large number of the species ; some, should the 

 weather prove favourable, are to be met with at the end of March, but 

 during April and May the majority are found : a few, however, are au- 

 tumnal insects. As a general rule, I have observed that those species 

 whose bodies are covered with pubescence, appear in early spring ; 

 others, as A. Rosae, haemorrhoidalis, &c, whose bodies are nearly 

 naked, do not appear until the later and hotter months of the season. 

 Although these bees are solitary, each bee forming its own nest, still 

 at times they congregate in large numbers, forming extensive colonies; 

 the largest I ever observed, was one of A. fulvescens, occupying a 

 space of twenty yards in length, and about two in breadth ; the bur- 

 rows were innumerable, and so multitudinous were the bees, that hun- 

 dreds might be captured by sweeping a net over the ground. 



Generic characters. — Antennae subclavate in the female, filiform in 

 the male ; mandibles long, much longer in the male than the female ; 

 labial palpi four-jointed ; maxillary palpi six-jointed ; the tongue 

 short, flat, generally acute, not folded backward ; the wings with one 

 marginal, and three submarginal cells ; the female furnished with a 

 floccus at the base of the posterior thighs, and the posterior tibiae and 

 first joint of the tarsus have a thick scopa, or pollen-brush. Abdomen 

 of the female ovate, having six segments, that of the male oblong- 

 ovate, or lanceolate, having seven segments. 



Sp. 1. Andrena hemorrhoidals, Fab. 

 Melitta hcemorrhoidalis, Kirby. 



Female — (Length 6 — 8 lines). Black, shining, the face thinly 

 clothed with griseous hair, a line of short silvery hair along the inner 

 margin of the eyes ; the antennae rufo-piceous beneath. Thorax 

 punctate, with three slightly impressed lines on the prothorax ; the 

 tegulae and nervures ferruginous ; the wings testaceous, their apical 

 margins clouded ; the legs have a fulvous pubescence, the floccus 

 pale fulvous, the scopa bright fulvous, the tarsi ferruginous. Abdomen 

 oblong-ovate, depressed, the first segment, excepting the extreme base, 

 is red, as is also the whole of the second, and the apical margin of the 

 third ; the second segment has a lateral black dot on the margin of the 



