APID.E. 315 



$ much more finely punctured than tho third, fifth entire 

 at the apex, its puncturation hardly visible, sixth longer 

 than the dorsal valve, carinated, constricted near tho apex, 

 with its sides simply sinuate, without any indication of a 

 lateral tooth; legs clothed with brownish grey hairs, all 

 the calcaria sharp and black. 



L. 12-13 mm. 



Local. Occurs from June to August. Chobham ; 

 Woking; Hastings. Wakefield; Yarmouth; {Smith), 

 Norfolk; {Bridgman). Bury St. Edmunds; {Tuck), 

 Ipswich; (liothiici/). 



C. rufescens, Lfj). (var., umhrina, Smith). — Very like 

 the preceding but larger in the typical form, less densely 

 pubescent in the cj, the apical margin of the basal segment 

 much more emarginate, fifth segment with a distinct lateral 

 projection at the apex, fourth ventral segment with the 

 emargination slightly wider, armature with the stipites 

 narrower, slightly curved and divergent towards the apex, 

 almost as long as the sagittce which are much narrowed 

 and convergent to the apex. 



The ? differs from quadridentata in the more emarginate 

 basal segment, the more shining and strongly punctured 

 sixth segment which is slightly reflexed towards the apex, 

 and less acuminate, the fifth ventral segment is much longer, 

 more pointed and more strongly punctured, the sixth is 

 short, its sides subparallel, its apex obtusely angulated. 



L. 10-15 mm. 



Common in some localities, occurring from June to 

 August and very variable in size, the small variety 

 umhrina used to be considered a distinct species, but it 

 possesses no distinctive structural characters. 



Chobham, associating with Mcgachile clrcumcincta. 

 Bury St. Edmunds; (Tuck), Isle of Wight, associating 

 with Osmia xanthomelana; North and South Devon ; Kent; 

 Surrey; Hants; Yorkshire and Loch Rannoch, Scotland; 

 [Smith). Colchester; [Ilarwood). Norwich; {Bridgman). 



