160 AVIDM. 



ferruginous pubescence ; the margin of the sixth segment slightly- 

 notched in the middle and deeply emarginate laterally, forming 

 a stout incurved tooth ; the apical segment concealed, bidentate. 



B.M. 



This is a very common species in the western and south-western 

 counties, but has not been received from the north ; it usually 

 appears about the end of April, but has been taken in March. It 

 has been observed to be most abundant in chalky districts, where it 

 is common on the Lotus corniculatus. Very fine and richly coloured 

 specimens have been taken in North Wales, at Llanberis. In the 

 neighbourhood of Bristol this bee very commonly constructs its cells 

 in snail-shells. 



9. Osmia bicolor. 



0. hirsuta aterrima, abdomine tarsisque quatuor posticis hirsuto 

 ferrugineis ; corpore in mare fusco-seneo, hirsuto pallido, ano 

 emarginato. 



Osmia bicolor, Latr. Encycl. Meth. viii. 580 § . 



St.-Farg. Hym. ii. 318 $ (nee tf ). 



Smith, Zool. ii. 746 <$ $ ; Bees Great Brit. 165. 



Nyland. Notts, ur Sallsk. pro Faun, et Flo. Fenn. ii. 103. 



SchencJc, Nass. Bien. 338. 



Thorns. Hym. Scand. ii. 250. 

 Apis bicolor, Schrarik, Ins. Austr. 400. 



Kirby, Mon. Apum Angl. ii. 277 $ . 

 Apis fusca, Christ. Hym. 182, tab. 14. fig. 10 $ . 



Panz. Faun. Germ. 56. 11 £ . 

 Antliophora fusca, Fabr. Syst. Piez. 377. 

 Osmia fusca, Gerst. Stett. ent. Zeit. (1869) 351. 



Female. Length 4^-5 lines. — Black ; the head not quite so wide as 

 the thorax, both clothed with deep black pubescence ; wings sub- 

 hyaline, their apical margins having a fuscous cloud, the nervures 

 and tegulee black ; the intermediate and posterior tibiaa and all the 

 tarsi have a short ferruginous pubescence ; the tarsi obscure ferru- 

 ginous. Abdomen subglobose, clothed with bright ferruginous pu- 

 bescence above and beneath ; the base above has a little black 

 pubescence. B.M. 



Male. Length 4 J lines. — Fusco -aeneous, head and thorax very 

 closely punctured ; the face clothed with pale yellow pubescence, 

 that on the clypeus very dense and nearly white. Thorax — the 

 disk thinly clothed with pale yellow pubescence, much paler on the 

 sides, hoary beneath ; the legs have a pale pubescence, the apical 

 joints of the tarsi ferruginous. Abdomen oblong-ovate, shining, 

 and thinly covered with long pale pubescence ; two or three of the 

 apical segments have a fringe of pale fulvous pubescence, as well 

 as the extreme lateral margins of the abdomen ; the margin 

 of the sixth segment entire, the seventh bidentate or rather deeply 

 notched. B.M. 



