76 BEES OF GREAT BRITAIN. 



have been attacked by Stylops : of two males and one female, 

 the latter has a female Stylops in its abdomen ; one of the former 

 has the marks of two males having escaped from it, the other 

 appears to have had but one. Some species of Andrena appear 

 to be always attacked, others occasionally, whilst a few appear 

 to escape entirely. 



29. Andrena bimaculata. 



A. nigra, rufescenti-villosa ; capite atro ; ventre basi utrinque 

 macula rufa notato. 



Melitta bimaculata, Kirby, Mon. Ap. AngL ii. 115. 56. 

 Andrena bimaculata, Smith, Zool. v. 1739. 22. 



Male. Length 5^ lines. Black ; the pubescence of the head 

 black, brownish on the clypeus : antennae nearly as long as the 

 thorax, the joints of the flagellum subarcuate. Thorax : above 

 clothed with obscure ferruginous pubescence, on the sides and 

 beneath it is paler ; wings subhyaline, faintly clouded at their 

 apical margins, the nervures pale ferruginous. Abdomen 

 ovate-lanceolate, the margins of the segments obscurely testa- 

 ceous ; thinly covered with pale ferruginous pubescence ; be- 

 neath, the second segment has two red spots. B.M. 



This male most closely resembles that of A. Trimmer ana, but 

 is certainly distinct ; it has no tooth at the base of the mandibles. 

 Only two specimens are known, the typical one, and that in the 

 British Museum. 



30. Andrena Smithella. 



A. nigra, grisescenti-subhirsuta ; thorace abdomineque hirsuto- 

 fulvescentibus ; segmentorum marginibus pallidis. 



Melitta Smithella, Kirby, Mon. Ap. AngL ii. 131. 70. 

 Andrena Smithella, Smith, Zool. v. 1748. 37. 



Female. Length 5-6 lines. Black; the pubescence on the face 

 pale fulvous, a few scattered black hairs on the vertex. Thorax : 

 above, clothed with rufo-fulvous pubescence : the tegul^e nigro- 

 piceous, the wings hyaline, faintly clouded at their apical mar- 

 gins, the nervures ferruginous ; the legs have a pale fulvous 

 pubescence, the floccus and scopa beneath bright pale fulvous, 

 having in certain lights a silvery hue ; above, slightly fuscous. 

 Abdomen ovate, slightly depressed, the segments having, except 

 at their base, a long, suberect, pale fulvous pubescence ; the 



