34 Myron Harmon Szvenk 



face marks which extend in a narrow line above level of antennae, 

 whitish; sometimes lines behind eyes, always two large spots on meso- 

 scutellum and usually two small dots just outside them, stripe on anterior 

 femora beneath, bases and apices of the tibiae usually connected by a 

 narrow stripe at least on posterior pair, and all of the basitarsi, yellow; 

 pygidium with a yellow spot and terminating in a very stout short blunt 

 spine; 13-16 mm zebratum 



Dianthidium (Heteranthidium) zebratum Cresson. 



1872. Anthidiiim zebratum Cresson, Trans. Am. Ent. Soc, IV, p. 



270, (S- 

 1902. Protanthidium cockerelli Titus, Entomological News, XIII, pp. 



170-171, ^ (?). 

 1909. Heteranthidium zebratum Cockerell, Entomological News, XX, 



p. 261. 



This handsome species was described from a single male from 

 Texas, but was also recorded from Colorado at the time of de- 

 scription by Cresson. Later Cockerell has recorded it from Boul- 

 der, Colorado, where it visits Helianthus pnmiltis during latter 

 August. Titus described cockerelli from two male cotypes taken 

 at Rocky Ford and Virginia Dale, Colorado, August 10 and Sep- 

 tember 3, the latter specimen on Rndbeckia hirta. Numerous 

 specimens in the large series of zebratum before the writer differ 

 in no way from the description of this species, and probably cock- 

 erelli is a synonym of zebratum. D. zebratum occurs in western 

 and central Nebraska, and is especially common in Sioux and 

 Dawes counties, where it has been collected at Jim creek, Monroe 

 canyon, Sowbelly canyon, Harrison, Glen, Crawford, and in the 

 Hat creek Bad Lands, July 26 to August 27 at flowers of Helian- 

 thus annuus, Helianthus petiolaris and Gutierrezia sarothrae. 

 Other Nebraska specimens come from Haigler, Dundy county, 

 and from Halsey, Thomas county, at the latter locality on Helian- 

 thus petiolaris and Helianthus subrhomboideus. Also, eight brood 

 cells, which from their large size almost certainly belong to this 

 species, were collected in Cherry county by J. M. Bates and are 

 now before the writer ; they are elongate oval, resinous cells, pos- 

 sibly formed from the resinous exudations of the sunflowers 

 which this bee seems so fond of visiting. 



This species occurs also at Custer, South Dakota, and the male 



34 



