38 ENTOMOLOGICAL NEWS [Feb., '2O 



minutely punctured^ the sides of first and second, apex of second and all 

 of the following with thin pubescence which forms faint apical bands. 



Blue Rapids, Kansas, June 20, 1919; 5 females at flowers 

 of Megapterium missouriense, nearly an hour after sunset. 



Type No. 12033, w ^l De placed in the U. S. National Mus- 

 eum. Paratypes in collections of Prof. T. D. A. Cockerell, 

 Prof. M. H. Swenk, and the writer. 



A species similar in appearance to H. aberrans Cwfd.; 

 slightly larger, mesonotum a little more closely punctured, 

 pubescence of abdomen more scanty, the appressed type 

 nearly absent. Differing very much in the sculpture of the 

 propodeum which is similar to that of H. pectoralis Smith, to 

 which it would run in Crawford's table (Journ. N. Y. Ent. 

 Soc. 1907). It is quite different from pectoralis in its larger 

 size and characteristic scopa. 



The sparseness of the scopa, especially that of the femur, 

 which is characteristic of these three species is evidently an 

 adaptation to the collecting of onagraceous pollen. 

 Halictus (Evylaeus) swenki Crawford. 



1906. Halictus swenki Crawford. Ent. News. v. 17, p. 275. 9 

 Truncation of propodeum with rounded angles, basal area medially 

 with a few irregular ridges which reach about half way to the angle, later- 

 ally with faint striae which reach the angle. Second submarginal cell 

 narrowed fully one-half above, first recurrent nervure interstitial, or very 

 nearly, with second cubital. 



c?. Length about 7mm. Similar to the female, thorax more smooth 

 and shining. Face subquadrate, little narrowed below; clypeus not pro- 

 duced, only gently rounded; mandibles slender, their tips reaching nearly 

 to the bases of the opposite ones; apical half of clypeus and basal middle, 

 labrum and basal two-thirds of mandibles, pale yellow; antennae reddish 

 yellow beneath for entire length, joint 4 as long as 2 + 3, the latter about 

 equal. Legs reddish yellow, anterior and middle femora at base, most of 

 posterior femora and tibiae, dark brown on outer side; tarsi pale. 



In the sand hills near Sheldon, North Dakota, Aug, 6 to 21, 

 1916-19. Allotype No. 12317. About a dozen females and 

 twenty males, chiefly at flowers of Allionia hirsuta and Petalo- 

 stemon villosum, also at Linum rigidum and Hieracium scabrius- 

 culum. 



The male is noteworthy for the low, broad clypeus. Of 

 the species which I have, only H. forbesi Rob. is similar in 

 this respect. 



