ART. 6 HALTCTINE BEES FROM SIBERIA COCKERELL 9 



tilled: iiiediun depressed line of mesothorax distinct, a trace of one 

 on scutellum : sides of thorax dull, except a shining area beneath 

 Avings; area of metathorax large, with fine longitudinal plicae; 

 tegulae ferruginous: wings reddish hyaline, stigma clear amber, 

 nervures dusky testaceous: basal nervure quite a distance from 

 nervulus: second cubital cell much narrower than third; recurrent 

 nervure meeting second intercubitus ; legs black, with small joints of 

 tarsi rufescent; abdomen shining, a little white hair at lateral bases 

 of second and third segments. Hind spur with six short spines. 



Tiitihe, Siberia, July 14, 2 females, type locality (W. P. Cockerell) ; 

 Kudia River, Julv 2, female (Cockerell). 



Type.— C?it. No. 27346, U.S.N.M. 



This greatly resembles the European //. pauxillvs Schenck, but 

 that species has a hind spur with a stout basal tooth, followed by 

 four successively smaller rounded laminae, an an-angement quite 

 different from that of any of the Siberian forms. 



HALICTUS SUPRAFULGENS, new species 



Fenmle. — Length nearly 7 mm., anterior wing 5.3 mm.; black, 

 robust, hind margins of abdominal segments only very narrowly 

 reddish ; hair of head and thorax thin and dull whitish, but long and 

 rather abundant on scutellum and pleura ; head very broad ; mandi- 

 bles slightly reddish apically; clypeus shining, sparsely punctured; 

 front slightly shining; mesothorax and scutellum shining, distinctly 

 punctured, scutellum broadly depressed in middle; sides of thorax 

 dull and rough, no shining area below wings; area of metathorax 

 sharply defined, polished and shining, with imperfect and irregular 

 basal plicae; posterior truncation shining, the lateral edges complete; 

 tegulae rufous; wings dusky hyaline, slightly reddish; stigma dull 

 reddish, nervures pale but dusky; basal nervure close to nervulus; 

 second cubital cell conspicuously contracted above, receiving recur- 

 rent nervure before end; outer nervures weakened; abdomen highly 

 polished, the punctures very small and weak ; bases of segments 2 to 

 4 with broad conspicuous bands of white tomentum, narrowed or 

 failing in middle. 



Okeanskaja, Siberia, August 5, 1 female (Cockerell). 



Type.—Qf^i. No. 27347, U.S.N.M. 



HALICTUS SULCATULUS, new species 



Female. — Length nearly 6 mm., anterior wing 5.2 mm.; black, 

 robust, with scanty grayish-white hair; head rather broad oval; 

 mandibles black, faintly reddish at tip ; clypeus somewhat produced, 

 sliining, irregularly, and rather closely punctured; front somewhat 

 shining, very densely punctured; antennae black, the flagellum ob- 

 scurely reddish beneath apically ; mesothorax and scutellum shining, 



