68 THE CANADIAN ENTOMOLOGIST 



one or two of the North Dakota specimens show rather straight, coarse ridges 

 on the propodeum, on the rest it is more reticulate with fine ridges, an enclosure 

 often suggested but not well developed. 



Agapostemon splendens (Lep.). 



Fargo, 3 females Oct. 15, 21 and 27, 1915, at Grindelia squarrosa and Tara- 

 xacum taraxacum; Sheldon, Aug. 28 and 30, 1920; 5 females; 5 males at Sheldon, 

 Aug. 10, 1918, and one at Sentinel Butte Aug. 30, 1914. The male from Sentinel 

 Butte and one of those from Sheldon have the first abdominal segment entirely 

 black at base instead of yellowish medially. 



In the sand hills near Sheldon this bee was found nesting on the sides of a 

 "blow out" where the sand was fairly stable and sparsely covered with grass 

 tufts. A female was seen at a hole so I decided to attempt an excavation of a 

 similar opening. The one selected showed particles of pollen near the opening. 

 The shaft proved to be about 8 mm. in diameter and vertical for about 1 m. 

 Here it was lost but a lateral was found which extended irregularly somewhat 

 backward and downward for about 3 dm. Two other similar branches, sup- 

 posedly of the same shaft were found, the second about 6 cm. below the first. 

 An enlargement of the end of the branch formed the single cell which was smooth 

 within but fell to pieces at a touch. A ball of pollen found in No. 2 was nearly 

 spherical, 8 mm. in diameter. The first contained pollen but was disturbed in 

 digging, the second apparently spoiled pollen. 



Three other nests were opened and in each the female was found working 

 on the vertical shaft, two at a depth of 1 m., and one at 1.5 m. Many other 

 similar openings were seen, perhaps one or two per meter in suitable parts of 

 the bank. Some were open, some closed, usually surrounded by a very small 

 handful of sand. 



Augochlora confusa (Rob.). 



This is not at all common. I took at Fargo a female at Hydro phyllum, 

 virginicum, another at Zizia aurea on June 14, 1913; one at Grindelia squarrosa, 

 Aug. 17, 1911. On June 23, 1917, I found them quite abundant, collecting 

 pollen of Erigeron philadelphiciis; on Aug. 25, and Sept. 11 of same year com- 

 mon at Aster paniculatus, also A. laevis, Solidago canadensis, and Vernonia 

 iasciculata; males at Helianthus maximiUani, H. tuherosus, and Solidago cana- 

 lensis. 



Halictus texanus (Cress.). 



My sister, Edna M. Stevens, sent me females taken at Blue Rapids, Kans., 

 May 30, 1920, the same place that I found them the year before (Ent. News 

 31:36). She found them abundant at the Megapteriiim flowers about 7.30 p.m., 

 but saw only one at 8.30. On June 10, at another place about two miles 

 distant she found them at 8.30, a single one at Achillea millefolium. 



Halictus oenotherae (Stevens). 

 Three females. May 30, 1920 (with the texanus), one bearing a full load of 

 pollen as I have described for texanus. 



Halictus aberrans (Crawford). 

 A small amount of data relative to time of flight (females only) and opening 

 of Gaura coccinea flowers was obtained the past season at Rugby, N. D. 



