4. ANDRENA. 39 



ments thinly clothed with long pale fulvous pubescence ; the apical 

 margins of the following segments have a long fringe of the same 

 colour at the sides of the abdomen. B.M. 



The female of this species is the most beautiful in the genus, and 

 is a most abundant insect, usually appearing with the apple- 

 blossoms, to which it delights to resort ; it is particularly abundant 

 on Hampstead Heath, where in 1840 I captured several pairs in 

 coita, since which time I have on more tban one occasion detected 

 them in company. The male is so unlike the female that nothing 

 short of such an observation, except finding them in their burrows, 

 could lead any one to suppose that they belonged to the same species. 

 The best time for making such observations appears to be between 

 nine and eleven on fine quiet sunny mornings. The beautiful 

 colouring of A. fulva soon fades by exposure to the sun ; it is 

 therefore necessary to watch for their first appearance: the female 

 fades to a pale yellow, and is subject to have the pubescence rubbed 

 off; whilst the male becomes entirely of a hoary grey. Xo ex- 

 amples of this species have been received from Scotland ; but it will 

 probably be found there, as it is met with in Denmark, Sweden, 

 Norway, and Finland. 



17. Andrena clarkella. 

 A. atra, hirsuta, thorace pedibusque posticis fulvis. 



Andrena clarkella, Smith, Zool. v. 1774 S ?; Bees Great Brit. 65. 



Nyland. Xotis. ur Sallsk. pro Faun, et Flo. Fenn. i. 212. 



Schenck, Nass. Bien. 2-')7. 



Thorns. Opusc. Ent. 148 ; Hym. Scand. ii. 8i). 

 Melitta clarkella. Kirby, Mon. Apum Angl. ii. L30 $ . 

 Andrena dispar, Zett. Lis. Lapp. 400. 

 Andrena bicolor, St.-Fary. Hym. ii. 243 {nee Fabr.). 



Lucas, Expl. Se. Alyer. iii. 180. 



Female. Length 5-G.i lines. — Black ; the pubescence black, ex- 

 cepting that on the disk of the thorax, posterior tibiae and tarsi, 

 and a little at the base of the abdomen, which is fulvous ; the 

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

 vures ferruginous ; the posterior tibia) and tarsi fulvo-piceous ; the 

 intermediate tarsi fulvous beneath. Abdomen ovate, entirely 

 black. B.M. 



Var. a. The two basal segments fringed with fulvous pubescence. 



Var. /3. All the abdominal segments fringed with fulvous pubes- 

 cence. 



Male. Length 4^-5 lines.- -Black ; the pubescence on the clypeus 

 pale fulvous, above which, as well as along the sides of the face, it is 

 clack ; the disk of the thorax clothed with fulvo-ochraceous pubes- 

 bence ; on the metathorax and beneath it is pale fulvous ; the 

 wings hyaline, iridescent and faintly clouded at their apical mar- 

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

 pubescence ; the apex of the posterior tibia' more or less pale tes- 



