BEES OF GREAT BRITAIN. 157 



each side of the metathorax and abdomen at its base ; a mi- 

 nute cinereous spot sometimes on each side of the third 

 segment. (Tisiphone, Newm.) 



Male. Length 6-7 lines. Black ; the face has the pubescence 

 cinereous, that on the thorax is of the same colour; the scu- 

 tellurn bidentate and covered with black pubescence, the inter- 

 mediate tibiae above and the posterior pair at their base have a 

 short white pubescence. Abdomen : the base thinly clothed 

 with cinereous pubescence, and having on each side a tuft of 

 nearly white pubescence, a similar tuft on the second, and two 

 minute white spots on each of the following segments placed 

 laterally, and sometimes the fifth segment is also spotted. B.M. 



The male seldom varies in the markings of the abdomen, and 

 the colouring in other respects is pretty constant ; but if the in- 

 sect is reared from the cells, the entire pubescence will have an 

 ochraceous tint ; the same is the case in very recent specimens 

 taken at large : the female varies greatly, from the pretty 

 spotted insect described to one totally black. This species is 

 found in all parts of the United Kingdom ; it may be seen in 

 multitudes, frequenting the nests of Anthophora acervorum ; in 

 these attacks it is frequently accompanied by Chrysis ignita. 



Subfamily 3. DASYGASTR^, Latr. 

 Genus 7. OSMIA. 



Apis, pt.,Zmw. Syst. Nat. 953 (1766). 

 Andrena, pt., Fabr.Ent. Syst. ii. 307 (1793). 

 Anthophora, pt., Fabr. Syst. Piez. 372 (1804), 

 Osraia, Latr. Encycl Meth. viii. 576 (1791). 

 Amblys, King, Illig. Mag. vi.(1807). 

 Hoplitis, Kluff, Illig. Mag. vi. 

 Trachusa, pt.', Jurine, Hym. (1808). 

 Diphisis, St. Farg. Hym. ii. 307 (1841). 



The labial palpi four-jointed, the basal joint elongate, the se- 

 cond nearly twice as long, the third and fourth minute, the third 

 inserted at the apex of the second, the fourth at the apex of the 

 third, the two latter clavate, truncate at their apex. The maxillary 

 palpi four-jointed, the basal joint stoutest, broadest at the base, 

 about the same length as the second and third joints, the apical 



