g PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



men dull and glaucous, finely punctured, conspicuous entire white 

 hair-bands at bases of segemnts 2 to 4; two tufts of reddish hair be- 

 neath near apex; legs black, with light hair; spurs white. 



Kongaus, Siberia, August, 1 male (Cockerell). 



Type.— Co-t. No. 27342, U.S.N.M. 



Compared with H. sexnotatus Kirby, this differs at once by the 

 dull abdomen, sharply margined truncation of metathorax, more 

 produced and apically narrower clypeus, more slender flagellum, 

 etc. The metathorax is more like that of H. major Nylander, but 

 the abdomen is totally different. In the North American fauna it 

 recalls H. trisonatus Cresson, which also has a glaucous abdomen, 

 but other characters differ greatly. 



Named after Dr. Paul de Wittenbourg, author of an extremely 

 valuable account of the geology of the region about Vladivostok, 

 who rendered our expedition many invaluable services. I consid- 

 ered the possibility that this might be the male of H. tacitus Cock- 

 erell, but on comparison was obliged to reject this hypothesis. 



HALICTUS SHISHKINI, new species 



Male. — Length about C") nmi., anterior wing 5.4 mm. ; black, with 

 rather thin white hair, not at all tinged with yellow on thorax above ; 

 head broad, but inner orbits subemarginate, and eyes strongly con- 

 verging below ; face and front with white hair ; clypeus with a large 

 pale yellow patch, sending a median process upward; labrum yel- 

 low; mandibirs pale yellow in middle and rufous apicalh^; antennae 

 black, reaching to the end of thorax, flagellum stout; a polished 

 space in front of anterior ocellus ; mt sothorax shining, rather closely 

 and quite distinctly punctured; scutellum coarsely rugosoplicate ; 

 area of metathorax well defined, with about sixteen vermiform 

 rugae; posterior truncation well defined, and with a series of lateral 

 pits; pleura rugose; tegulae clear rufous; wings hyaline, stigma and 

 nervous light ferruginous; second cubital cell rather narrow, but 

 much more than half width of third, receiving recurrent nervure 

 well before end ; outer nervures somewhat weakened ; legs black, Avith 

 knees, anterior tibiae in front, all tibiae at both ends, and tarsi, 

 creamy-white, more reddened on front tibiae ; spurs white ; abdomen 

 long and slender, highly polished, with very minute punctures; no 

 hair-bands or spots; hind margin of second segment narrowly red- 

 dened ; no subapical ventral tuft of reddish hair. The tub;rcles have 

 a small light spot. 



Kongaus, Siberia, August, 1 male (Cockerell). 



Type.—C2Li. No. 27343, U.S.N.M. 



Something like U. fulvicomis Kirby, but at once separated by the 

 shining mesothorax and dark antennae. In the American fauna it 



