1920 Insects. 



have a white pubescence ; the claws ferruginous. Abdomen ovate- 

 lanceolate, v r ery smooth and shining, and having a thin scattered white 

 pubescence ; the extreme apex ferruginous. 



This is a scarce bee : the female is now first described. I have 

 captured both sexes at Weybridge, and have also received the male 

 from the Rev. Mr. Little, from Scotland. The male resembles the 

 same sex of the A. analis, but the small angular patch of white on 

 each side of the clypeus will at once separate them, exclusive of other 

 differences. 



Sp. 52. Andrena argentata, Smith. 



Female. — (Length 4 lines). Head, the clypeus very minutely and 

 delicately punctured, with a few scattered larger punctures intermixed; 

 from the base of the antennae to the occiput delicately longitudinally 

 striated ; the inner orbit of the eyes with a line of pale silvery hairs ; 

 antennae black above, piceous beneath. Thorax thinly clothed above 

 with pale fulvous hairs ; all the legs clothed with silvery hairs, the 

 floccus on the posterior pair silvery white ; the tibiae clothed with 

 hairs of the same colour; all the tarsi pitchy red. Abdomen shining 

 black ; the margin of the second, third and fourth segments with a 

 band of silvery hairs, the centre fuscous ; the margins of the segments 

 beneath have also a fringe of silvery hairs. 



Male. — (Length 3 lines). Closely resembling the female, except 

 that the thorax is altogether clothed with silvery hairs, and the abdo- 

 men has an additional band of silvery hairs, also a few silvery hairs 

 on the lateral margins of the first segment. Nomada Baccata is para- 

 sitic upon this species. 



Sp. 53. Andrena analis, Panzer. 



Female. — (Length 4 lines). Black ; the face thinly clothed with 

 w r hite pubescence ; the antennae piceous beneath ; the mandibles fer- 

 ruginous at their tips. Thorax, the pubescence on the disk very 

 sparing, nearly white ; quite white on the sides, and at the sides of 

 the metathorax ; the tegulae piceous ; the wings iridescent, hyaline, 

 and slightly clouded at their margins ; the posterior tibiae and tarsi, 

 the intermediate tarsi, and apical joints of the anterior tarsi, ferrugi- 

 nous ; the floccus white ; the scopa yellow. Abdomen convex, shin- 

 ing, and having a little white fringe on the margins of the segments 

 laterally, also a very thin scattered white pubescence, particularly at 

 the sides ; the apical fimbria fuscous. 



