4. ANDRENA. 67 



man has fortunately captured the sexes of the two species, each at 

 the different times of their appearance. 



54. Andrena nana. 



A. atra, albido villosula ; abdomine nitido, punctulato ; tibiis posticis 

 scopa argentea. 



Andrena nana, Smith, Zool. v. 1925 ; Bees Great Brit. 97. 



Nyland. Notts, ur Sallsk. pro Faun, et Flo. Fenn, i. 221 ? 



Schenck, Nass. Bien. 261. 



Thorns. Hym. Scand. 104. 

 Melitta nana, Kirby, Mon. Apum Angl. ii. 161 S $ • 



Female. Length 3 J lines. — Black ; on each side of the face a line of 

 silvery pile along the margins of the eyes. Thorax, a little cine- 

 reous pubescence on the metathorax and at the sides ; that on the 

 legs is of the same colour ; the tegulae piceons, the wings subhya- 

 line, the nervures ferruginous ; the posterior legs have the rloccus 

 white, the scopa silvery, bright and glittering ; the basal joint of 

 the tarsi slightly fulvous within ; the apical joints of the tarsi fer- 

 ruginous. Abdomen elongate-ovate, shining and delicately punc- 

 tured ; the apical margins of the segments depressed and impunctate ; 

 on the apical margins of the three intermediate segments, laterally, 

 a fringe of white pubescence ; the apical fimbria white, with more 

 or less of a fulvous tinge ; beneath, the margins of the segments 

 thinly ciliated with white hairs. B.M. 



Male. Length 3 lines. — Black ; the antennae nearly as long as the 

 thorax, the face with long thin white pubescence, the cheeks 

 bearded with the same. The thorax has thin cinereous pubescence,' 

 that on its disk is sparing and faintly ochraceous ; wings hyaline, 

 splendidly iridescent and slightly clouded at their apex ; the apical 

 joints of the tarsi rufo-testaceous. Abdomen oblong- ovate, shining, 

 and with the extreme apex pale testaceous. B.M. 



This insect usually appears about the end of May, and is found 

 during June and July. Its female is readily separated from that of 

 the two preceding species by its long and punctured abdomen. Its 

 male could only be confounded with that of A. minutula, from 

 which its longer antennae, the puncturing of its thorax, which is much 

 finer, shallower, and irregularly scattered, separates it ; that of A. 

 minutula is stronger, deeper, and more regular. The species is 

 generally distributed : I have found it very abundant in Yorkshire. 



55. Andrena argent at a. 



A. atra, argenteo villosa, thorace pube pallida fulva; abdomine 

 ovato, fasciis tribus albis, in medio vix interruptis. 



Andrena argentata, Smith, Zool. ii.409, and v. 1920 ; Bees Gr. Brit. 98. 

 Nyland. Notis. ur Sallsk. pro Faun, et Flo. Fenn. ii. 256. 

 Thorns. Hym. Scand. ii. 99. 



F2 



