BEES OF GREAT BRITAIN. 105 



series of specimens enables us satisfactorily to determine the 

 range of variation to which the species is liable ; thus, the basal 

 joint of the posterior tarsi is sometimes entirely golden-yellow 

 within, but at other times it is fuscous towards the apex ; the 

 latter variety is the M. digitalis of Kirby. The sexes have a 

 strong general resemblance ; their abdomen is of a deeper black 

 than is usual in the Andrenida. 



66. Andrena Lewinella. 



A. nigra, pallide villosa; thorace tarsisque rufescentibus ; ab- 

 dominis segmentis intermediis utrinque albo-strigatis. 



Melitta Lewinella, Kirby, Mon. Ap. Angl. ii. 149. 88 <J . 

 Andrena Lewinella, Smith, Zool v. 1923. 58. 



Male. Length 3f lines. Black ; the face clothed with pale ful- 

 vous pubescence, the antennae nearly as long as the thorax. 

 Thorax : the disk clothed with dark rufous pubescence ; the 

 wings subhyaline, faintly clouded at their apical margins, the 

 nervures testaceous ; the legs have a griseous pubescence, the 

 tarsi, and posterior tibiae at their apex, rufo-testaceous. Abdo- 

 men fuscous, ovate-lanceolate, at the base a little pale pubes- 

 cence, the intermediate segments have on each side a white 

 marginal fringe, at the apex a little pale pubescence. B.M. 



A specimen of this species was captured in Sussex by Mr. S. 

 Stevens ; its female is not known; A. Lewinella is very like the 

 male of A. denticulata. 



67. Andrena Wilkella. 



A. atra, subvillor>a; abdominis segmentis intermediis utrinque 

 albo-marginatis. 



Melitta Wilkella, Kirby, Mon. Ap. Angl. ii. 145. 84 $ . 

 Andrena Wilkella, Smith, Zool. v. 1918. 49. 



Female. Length 5f lines. Black ; the face has on each side a 

 little pale fulvous pubescence, the flagellum is rufo-piceous be- 

 neath. Thorax shining, thinly clothed with pale fulvous pu- 

 bescence ; the wings fulvo-hyaline, the nervures testaceous ; the 

 legs have a pale fulvous pubescence, that on the femora gri- 

 seous ; the posterior tibiae and the basal joint of the tarsi pale 

 rufous, the tarsi ferruginous ; the floccus pale yellowish-white, 

 the scopa pale fulvous, the tarsi fulvous beneath. Abdomen 

 oblong-ovate, impunctate, the apical margins of the interme- 



F 5 



