Studies of North American Bees 27 



Dianthidium (Dianthidium) sayi Cockerell. 



1824. Megachile interrupta Say, Long's Second Expedition, II, App., p. 



351, $ 3 (not Megachile interrupta Spinola, 1806). 

 1854. Anthidium interruptum Smith, Cat. Hym. Brit. Mus., II, p. 214 



(not Anthidium interruptum Fabricius, 1804). 

 1864. Anthidium interruptum Cresson, Proc. Ent. Soc. Phil., II, p. 380, 



$ d". 

 1872. Anthidium interruptum Cresson, Trans. Am. Ent. Soc., IV, p. 



270, ? c?. 



1897. Anthidium interruptum Cockerell, Canadian Entomologist, 



XXIX, p. 223. 



1898. Anthidium curvatum (= interruptum) Cockerell, Bull. Sci. Lab. 



Denison Univ., XI, p. 62 (not Anthidium curvatum Smith, 



1854). 

 1907. Dianthidium sayi Cockerell, Canadian Entomologist, XXIX, p. 



136. 

 1907. Dianthidium sayi Cockerell, Unii'. of Colorado Studies, IV, p. 



250, ? ^. 



Western edge of the state and east along the Niobrara valley to 

 Rock county, flying abundantly from June 25 to September 9, at 

 flowers of H elianthus annuus, Helianthus- petiolaris, Helianthus 

 maximiliani, Gutierrczia sarothrae, Solidago missouriensis, Ver- 

 nonia fascicidata, Cleome serrulata, Kuhnistera Candida, Verbena 

 stricta and Mentzelia nuda. Before the writer is a series of 

 ninety females and fifty-four males collected at Warbonnet and 

 Monroe canyons, Hat creek, Bad Lands, Glen and Crawford, in 

 the Pine Ridge of Sioux and Dawes counties; Bridgeport, Morrill 

 county, and Cams, Rock county. A male specimen from Colo- 

 rado bears Gillette's No. 2243. This is the species recently {Ento- 

 mological News, XXIII, p. 257) recorded as D. curvatum Smith 

 (syn. interruptum Say) by Hungerford and Williams from west- 

 ern Kansas, the writer having examined the Thomas county male 

 specimen. The species doubtfully recorded by these authors as 

 D. concinnum Cresson is without question that species. 



Dianthidium (Dianthidium) ulkei (Cresson). 



1878. Anthidium Ulkei Cresson, Trans. Am. Ent. Soc, VII, p. 115, ?. 

 1897. Anthidium pudicum Cockerell, Canadian Entomologist, XXIX, 

 pp. 272-273 (in part). 



27 



