BEES IN BRITISH MUSEUM. 333 



Osmia chalybea Sni. % (T.). 



Is an Osmia s. str. sens. Rob. Seventh abdominal segment 

 strongly bidentate ; sixth broadly emarginate ; joint 4 of antennae 

 not nearly equalling 2 -f- 3. 

 Osmia laboriosa Sin. 9 • 



Yarkand, Asia. A peculiar species, with red legs and red and 

 black abdomen ; scopa red ; anterior margin of clypeus red and pro- 

 duced ; wings pale orange basally, and beyond fuliginous; first r. n. 

 joins second s. in. nearer its base than the second does to its apex. 



Osiiiiu lanrus Sm. 9 (Tj. 



Hiogo, Japan (Dalla Torre wrongly says China). Dark aeneous, 

 scopa red ; clypeus with a tubercle in the middle of anterior mar- 

 gin, and a long process on each side. The male has the antennae 

 very long, but not moniliform ; apex of sixth abdominal segment 

 ordinary and entire, of seventh also entire, but slightly depressed in 

 the middle ; apex of first ventral abd. s. entire. 



LITHUKtilS Berthold. 



Typical Lithurgus has no pulvillus in either sex ; I found none 

 in L. rufipes Sm. 9 , L. rubricatus Sm. 9 , L. collaris Sni. $ , L. 

 cor indus ( Fabr. ) 9> L. gibbosus Sm. 9» L. apicalis Cress. 9> L. 

 atratus Sm. % . In L. dentipes Sin. % , and L. dubius (Sich.) 9 , 

 there is apparently a minute or rudimentary pulvillus. In the 

 females of the Indian L. dentipes and atratus there is a small but 

 distinct pulvillus. In the males of the North American species, 

 which Fox separated as a genus Lithurgopsis, the pulvillus is quite 

 distinct. In the male of the Chilian L. dubius there is a long pul- 

 villus. If Lithurgopsis is a valid genus, which seems rather ques- 

 tionable, L. dubius should be referred to it; and we should appar- 

 ently have another generic name for the two Indian species, with a 

 pulvillus in the female. 



In all the species I examined, the claws were simple in the female, 

 cleft in the male. 



L. rubricatus, from Australia, has the hair at apex of abdomen 

 red, as in the American apicalis; its maxillary palpi are apparently 

 5 jointed. L. collaris, from Japan, has the hair at apex of abdo- 

 men black ; L. cornutus has it brown-black. 



L. gibbosus is easily distinguished from apicalis in the female, 

 because it has the facial prominence not at all bilobed. 



TBANS. AM. KNT. SOC. XXXI. SEPTEMBER, 1905. 



