ART. 6 HALICTINE BEES FROM SIBERIA COCKERELL 11 



HALICTUS PERPLEXANS, variety 8PECUUNUS, new variety 



Female. — Differs by the polished and shining mesothorax and scu- 

 telhim, the latter very brilliant, the punctures evidently separate; 

 area of metathorax less strongly plicate; head distinctly narrower, 

 longer than broad. 



Preobrageniya Bay, Siberia, type locality, July 12, 1 female 

 (Cockerell) ; Kudia Kiver, July 2, females (Cockerell). 



Paratype.—Q^t. No. 27349, U.S.N.M. 



Comparing the types of perplexans and specuUnus, they certainly 

 seem to be different species, although the rather striking abdomen 

 is exactly the same in both. Some of the other specimens, however, 

 are more or less intermediate, so I feel obliged to treat specuUnus 

 as a variety. The species is somewhat related to H. opacv^ Perez, 

 but quite distinct. It is still closer to H. interruptus Panzer, but 

 readily separated by the area of metathorax. 



HAUCTUS BRACHYCEPHALUS, new epeeies 



Female. — Length about 5 mm., anterior wing a little over 4 mm. ; 

 black, with scanty grayish-white hair; head about as broad as long; 

 clypeus short and little produced, shining, with scattered punctures; 

 supraclypeal area large, convex, shining; sides of face glistening; 

 front dull, but region about ocelli shining; fiagellum ferruginous 

 beneath; mesothorax and scutellum moderately shining, very finely 

 punctured; scutellum with no impressed line; mesopleura dull, a 

 little shining above; area of metathorax granular, dull, feebly pli- 

 cate at base; posterior truncation shining; tegulae ferruginous; 

 wings hyaline, slightly reddish; basal nervure rather close to ner- 

 vulus; stigma and nervures dusky testaceous; second cubital cell 

 rather broad, third also unusually broad for this group; recurrent 

 nervure meeting second intercubitus ; legs black, with red knees and 

 smal! joints of tarsi; hind tibiae robust; abdomen broad, polished, 

 hind margins of segments very narrowly rufous; narrow white hair 

 bands on lateral apices of segments 3 and 4; apex of abdomen 

 ferruginous. 



Kongaus, Siberia, August, 3 females (Cockerell). 



This may be compared with H. gracilis Morawitz, but is very 

 distinct. 



HALICTUS TRICHOEIIINUS, new speeies 



Female. — Length about 6 mm., anterior wing 5.8 mm.; black, 

 very robust, with rather copious pale hair, which is very faintly 

 yellowish dorsally; face very broad, densely covered with grayish 

 hair; clypeus shining; front very densely punctured but distinctly 

 shining; antennae black, at most very obscurely reddish beneath 



