210 THE CANADIAN ENTOMOLOGIST 



rather to rhodocerata — ^"has quite the appearance of some Hesperapis, but is a 

 peculiar and isolated species." The finding of a species of this genus previously 

 known only from the southwestern United States, presents another interesting 

 question in the status of this group. The first lot were taken early in the fore- 

 noon, on a misty day and were inactive. The second trip proved. too much 

 the same to shed any further light on their habits. 



Calliopsis coloradensis (Cresson). 



Fargo, Valley City, Jamestown, Bismarck, Sentinel Butte, Lakota, Crary, 

 Devils Lake, Perth, Granville, Minot and Williston. A common bee, usually 

 at flov/ers of Grindelia squarrosa, also at Chrysopsis villosa; Aug. 4 to Sept. 10. 

 Specimens of this species have been examined by both Cockerell and Crawford . 



Calliopsis nebrascensis Crawford, (det. Crawford). 



Valley City, July 26, 1913. A number at flowers of Verbena hastata. 



Calliopsis andreniformis Smith, (det. Cockerell). 



Fargo, Aug. 24 and 26, 1912. One female and two males at flowers of 

 Melilotus alba. Another female on Solidago canadensis, Fargo, Sept. 11, 1917, 

 is referred by Cockerell to var. rhodophilus Ckll. 



Protandrena asclepiadis Cockerell. (det. Crawford). 



Minot, Aug. 22, 1915, 2 females; Marmarth, July 4, 1918, eight females, 

 ten males. At flowers of Lactuca pulchella, Petalostemon oligophyllum, Sym- 

 phoricarpos occidentalis and Astragalus gracilis (males, about sunset). 

 y Epeolus dacotensis, new species. 



Female.^ — 'Length 12-14 mm., stout, black with four w^hite abdominal 

 bands which are broad, entire and nearly straight; sparse white appressed 

 pubescence on margins of mesoscutum especially anteriorly, on collar, metano- 

 tum, tubercles and a small patch behind them, a few on base of abdomen and 

 sides of fifth segment; otherwise entirely black; a few erect, black hairs on upper 

 part of face, vertex, checks, pleura? and mesoscutum. 



Clypeus with close, shallow punctures and scattered larger ones; face 

 slightly narrowed below; maxillary palpi with only one evident free joint which 

 is about .3 mm. long; central lobes of mesoscutum large, low and rounded, the 

 lateral ones small, indistinctly pointed; mesonotum coarsely and somewhat 

 confluently punctured ; wings dark, the second submarginal narrowed nearly to 

 a point, third not narrowed; abdomen broad, band on first segment broader 

 than the rest, concase medially (from the base of the abdomen) ; last two bands 

 slightly curved at the sides; fifth segment with a large difi'erentiated area which 

 is scarcely at all flattened. 



Male.— Entirely similar, length 12-13 mm.; apex of abdomen truncate. 



Williston, North Dakota; one female (type No. 8969) Aug. 8, four males 

 Aug. 14, 1915; one of the males on flowers of Helianthus petiolaris, the other, 

 at a clay bank; Marmarth, North Dakota, July 4, 1918, two females on Lactuca 

 pulchel a and one on Helianthus petiolaris. A very distinct and striking species 

 probably parasitic on Anthophora occidentalis and A. neomexicana, colonies of 

 the former nesting at Williston, the latter at Marmarth. One of the Marmarth 

 females has the pale pubescence more abundant on the mesonotum, and extend- 

 ing considerably on the mesopleura' and a little on the outer sides of the legs, 

 especially the tibiae. 



