4. ANDRENA. 41 



Female. Length 5-5^ lines. — Black ; the pubescence on the head 

 black ; the thorax clothed above with ferruginous pubescence ; the 

 wings subhyaline, their apical margins slightly clouded, the ner- 

 vures ferruginous ; the floccus on the posterior trochanters pale 

 fulvous, the scopa fulvous, the basal joint of the tarsi ferruginous 

 within. Abdomen subovate, the pubescence on the three basal 

 segments ferruginous, their apical margins having a long fringe of 

 the same colour ; tbe apical fimbria sooty black ; the segments 

 beneath fringed with black pubescence. B<M. 



Male. Length 4-41 lines. — The face clothed with a long dense 

 black pubescence ; the antennae rather shorter than the thorax, 

 which has a dull, pale ferruginous pubescence ; the wings sub- 

 hyaline, iridescent, and slightly clouded at their apical margins ; 

 the legs fusco-ferruginous, and having a thin pale ferruginous 

 pubescence ; the apical joints of the tarsi ferruginous. Abdomen 

 ovate-lanceolate and having a scattered pale ferruginous pubes- 

 cence. B.M. 



This is a very common species, appearing in April, sometimes as 

 early as the latter part of March ; it is found plentifully in Scot- 

 land. It closely resembles the next species ; but that does not appear 

 before June, usually the latter part of the month, and is found 

 during July and the beginning of August. 



19. Andrena bicolor. 



A. atra, villosa ; thorace, abdominis segmentis primis tribus parce 

 rufo-hirtis ; tibiis posticis tarsisque runs, scopa fulva. 



Andrena bicolor, Fabr. Fnt. Syst. ii. 376 ; Syst. Piez. 326. 



Nyland. Notis. ur Sdllsk. pro Faun, et Flo. Fenn. ii. 253. 



Smith, Bees Great Brit. 67. 



Tho?ns. Opus. Fnt. 150 ; Hym. Scand. ii. 95. 

 Melitta pilosula, Kirby, Mon. Apum Angl. ii. 164 J . 

 Andrena sestiva, Smith, Zool. vii. Append. 60 § . 



Female. Length 4^-5-i- lines. — Black ; the face thinly clothed with 

 brown pubescence, the antennae nigro-piceous beneath ; the thorax 

 has a pale ferruginous pubescence, palest at the sides of the mefca- 

 thorax and beneath ; wings subhyaline, their nervures ferruginous ; 

 the legs dark rufo-piceous, the posterior tibiae and the tarsi ferru- 

 ginous ; the floccus pale fulvous ; the scopa fulvous, having a 

 golden lustre. The abdomen ovate, finely punctured ; the margins 

 of the basal segments thinly fringed with pale fulvous pubescence ; 

 the apical fimbria fusco-ferruginous ; the margins of the segments 

 beneath fringed with pale pubescence. B.M. 



Male. Length 3|-4 lines. — Black ; the head rather wider than the 

 thorax, narrowed behind ; the face covered with long dark fuscous 

 pubescence. Thorax clothed above with thin pale ferruginous 

 pubescence ; on the sides and on the legs it is cinereous ; wings 



