Studies of North American Bees 13 



it differs at once by its black legs, immaculate and apically toothed 

 clypeus and differently shaped pygidium. 



Anthidium porterae Cockerell. 



1864. Anthidium maculifrons Cresson, Proc. Ent. Soc. Phil, II, pp. 



2,73-27^, ? (nee Smith, 1854). 

 1900. Anthidium porterae Cockerell, Ann. Mag. Nat. Hist., series 7, V, 



p. 411, ? <s. 



1904. Anthidium porterae var. amahile Cockerell, The Entomologist, 



XXXVII, p. 7, c^. 

 1907. Anthidium porterae Cockerell, Univ. of Colorado Studies, IV, p. 



250, ? c?. 

 1907. Anthidium porterae amabile Cockerell, ibid., c?. 



A common species in western Nebraska. Monroe canyon, Bad 

 Lands, and Glen, Sioux county; Imperial, Chase county; Mitchell, 

 Scottsbluff county, Haigler, Dundy county and Lexington, Dawson 

 county, June 26 to August 17, at flowers of Kuhnistera Candida, 

 Cleome scrrulata and Hclianthiis petiolaris. In Dundy county 

 the writer has found the males commonly at flowers of alfalfa, 

 while L. M. Gates found both sexes commonly visiting it in 

 Scottsbluff county, and R. W. Dawson collected both sexes on 

 these blossoms in Dawson county. Many of our Nebraska males 

 have the ground color of the abdomen red, thus representing 

 Cockerell's variety amabile, but none of the series at hand is 

 referable to the subspecies personulatum Ckll., though some fe- 

 males have the clypeal spots very small and seem to approach 

 that form. More probably persomdatum will turn out to be a 

 valid species. There are also before the writer two males of 

 typical porterae from Costilla county, Colorado, one from Russell, 

 July 12, 1907, collected by H. S. Smith, and the other from 

 Ute creek, on sage flats, collected July 19, 1907 by R. W. Dawson. 

 Another male representing the variety amabile is labeled simply 

 Hecla, Wyoming (Clason). The species discussed as A. maculi- 

 frons Smith by Hunger ford and Williams (Entomological Nezvs, 

 XXIII, p. 256) is A. porterae, the writer having examined a 

 typical specimen forwarded him by Mr. Williams. 



Anthidium tenuiflorae Cockerell. 



1907. Anthidium tenuiflorae Cockerell, Canadian Entomologist, 

 XXXIX, p. 135, ? S- 



13 



