THE CANADIAN ENTOMOLOGIST 65 



FURTHER NOTES ON EVENING FLOWERS, PANURGINE AND 



HALICTINE BEES. 



BY O. A. STEVENS, 

 Agricultural College, N. D. 



The present paper is supplementary to two previously published on these 

 forms (Can. Ent. 51:205-210, Ent. News 31:35-44). Through the kind co- 

 operation of my friend Dr. J. F. Brenckle I was able to make a fourth visit to 

 the sand hills near Sheldon, North Dakota, and succeeded in obtaining the 

 females of Hesperapis carinata and Perdita tridentata* 



Notes on nesting of Agapostemon splendens were also secured and these with 

 data on the other species and of Augochlora in North Dakota are presented. I 

 am inclined to regard these two groups as subgenera of Halictus as has been 

 done by Ducke and \^iereck. 



No further data of interest on other panurgine bees in North Dakota has 

 been obtained, but the absence of Greeleyella at Rugby might be noted. It was 

 looked for there on June 30th to July 4th, but is doubtless an austral species 

 which does not extend quite that far (see Am. Journ. Bot. 7:231-242 for notes 

 on distribution of plants in the state). 



Hesperapis carinata Stevens. 

 1919. Hesperapis carinata Stevens, Can. Ent. 51:209, male. 



Female.- — Length about 12 mm. Very similar to male but stouter, hair 

 bands of abdomen prominent and cream coloured. Face sub-quadrate, sparsely 

 hairy on occiput, sides, around antennae bases, sides and anterior edge of clypeus; 

 clypeus bare or nearly so on median part, shining, rather finely but not very 

 closely punctured; vertex smooth and shining, antennae reddish beneath, browner 

 above, mandibles toothed. 



Mesoscutum inclined to be bare medially with a few, short, dark hairs. A 

 well developed scopa of rather stiff, short-branched hairs on posterior tibia and 

 basitarsus (femur and trochanter with only a few short hairs) that of the basi- 

 tarsus distinctly parted on posterior edge (Fig. 1-b). Sixth dorsal segment 

 narrowed, truncate, somewhat concave with a low raised triangle on basal 

 middle (Fig. 1-c) ; laterally this segment is pubescent as in the male, the dorsal 

 concave surface slightly striate. Wing nervures a variable pale brown, darker 

 than in the male. 



Nine specimens at flowers of Helianthus petiolaris in the sand hills near 



Sheldon, North Dakota, Aug. 21, 1920. Allotype No. 12688. When first 



attempting in 1916 to determine this bee, I was much puzzled as to its generic 



position, unless it belonged in Hesperapis of which I had neither descriptions 



nor specimens. Prof. Cockerell reported it as a new species of Halictoides. 



Mr. J. C. Crawford, however, when specimens were sent to the U. S. National 



Museum, wrote that it was a Hesperapis and called attention to the Y-shaped 



carina as distinctive. The general appearance of both sexes is much that of a 



Colletes. The stigma is poorly developed and is pale medially. The scopa is 



not similar to our other panurgines and the cleft in that of the basitarsus is 



unique as far as I know. 



*Types and allctypes of these are in \J . S. Nat. Mus. ; a paratype and metatype of Hes- 

 perapis, metatypes of Hesperapis, PerdiUi and Halictus Oenothera in .Acad. Nat. Sci. of Phila. 

 March. 1921 



