4. ANDRENA. 61 



Andrena bucephala, Steph. IUust. Brit. Ent. Supp. 17, pi. xliii. f. 4 J . 

 Andrena longipes, Smith, Zool. v. 1740 S $ ; Bees Great Brit. 90. 



Female. Length 5-6 lines. — Black ; the face thinly clothed with 

 pale fulvous pubescence, below the insertion of the antennae it is 

 somewhat griseous : antennae slender, more than half the length of 

 the thorax ; the flagellum rufo-piceous beneath. Thorax above 

 clothed with fulvous pubescence, paler on the metathorax and 

 sides ; the wings fulvo-hyaline, the nervures and tegulse pale 

 rufo-testaceous ; the legs have a thin fulvous pubescence, the 

 floccus white, the scopa and the pubescence on the tarsi of a golden 

 fulvous, very bright and glittering ; the tarsi rufo-fulvous, the 

 posterior tarsi usually of the same colour, but sometimes fusco- 

 ferruginous ; the legs more elongate tban usual. Abdomen ovate, 

 shining, and convex ; the apical margins of the second, third, and 

 fourth segments have a very narrow white marginal fringe, the first 

 two interrupted ; the apical fimbria fulvous. B.M. 



Male. Length 4-6 lines. — The head varying in size, sometimes 

 twice as large as the thorax, the mandibles forcipate ; the face has 

 a thinly scattered pale fulvous pubescence ; the clypeus shining and 

 finely punctured ; the antennas as long as the thorax. The thorax 

 and wings as in the female ; the tarsi and extreme apex of the 

 tibiae fulvo-ferruginous : the legs elongate as in the other sex. 

 Abdomen lanceolate, much narrowed at the base, naked and shining, 

 the margins of the segments obscurely rufo-piceous. B.M. 



This species appears usually about the end of April, and is very 

 local. Some years ago it was abundant near Highgate Archway, 

 where a large colony was established. The ground in which it was 

 formed has long been used in making bricks. The species is now 

 rare. The type of Stephens's A. bucephala is in the Museum. It is 

 a large example of my A. longipes, which name was used for some 

 years, having been proposed by Shuckard ; but as he never de- 

 scribed the species, I now adopt the name given by Stephens, who 

 both described and figured the insect. The only other localities for 

 this species, beyond the London district, known to me, are Bristol 

 (where it was taken by Dr. Thwaites) and Chobham Common. 



47. Andrena albicrus. 



A. atra, cinereo villosa, thorace fulvo ; abdomine ovato, pilosulo, 

 fasciis tribus albis. 



Andrena albicrus, Smith, Zool. v. 1924 ; Bees Great Brit. 91. 



Sehenck, Na&s. Bien. 251. 



Thorns. OpK.sc. But. 152 ; Hym. Scand. ii. 97. 

 Melitta albicrus, Kirby, Mon. Apum Angl. ii. 150 <$ $. 

 Melitta barbilabris, Kirby, lib. cit. 151 tf . 



Female. Length 5-5,4 lines. — Black : the face on each side and the 

 vertex have a little pale fulvous pubescence, the channel on each 

 side of the face covered with a fulvous pile ; the clypeus closely 



