56 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



1 cf, Riley Co., Apr. 30, Kimball (usnm); 1 cf, Topeka, Apr. 8, Popenoe (usnm); 

 1 9, west Kansas, Popenoe (usnm), Minnesota: 1 cf , 1 9, State label, (Blan- 

 chard coll., mcz; Howden). Missouri: 2 9 9 , St. Louis, June 17, 1935, U.S.D.A. 

 traps, (Enns coll.); 1 cf , 3 9 9 , St. Louis, April (Dury coll.); 1 cf, 1 9, State 

 label, T. Pergande coll. (usnm); 1 cT, 1 9 , Valley Park, Apr. 1, 1920, H. R. 

 Painter (usnm). Nebraska: 1 9, Chadron, May 15, 1955, Jellison (cnc); 1 9, 

 Spencer, June 10, 1931, G. E. Hudson (usnm); 1 cf, Superior, (Liebeck coll., 

 mcz); 1 cf, State label, (ansp); 1 cf, War Bonnet Canyon (cnc). ohio: 1 cf, 

 Champaign Co., Sept. 5, 1954, R. E. Woodruff (osu). south dakota: 1 cf, 

 Capa, May 11, 1922, H. C. Severin (usnm); 1 cf, Chamberlain, Sept. 14, 1946, 

 H. C. Severin (usnm); 1 9, Volga, Truman (usnm). no data: 1 cf, (Bowditch 

 coll., mcz); 19,0. Lugger coll. (cnhm). 



Remarks.^ — Variation in the specimens, here considered to be the 

 subspecies pseudorpheus, is not as great as in the other forms. Males 

 range from 5.8 to 9.0 mm. in length and from 3.4 to 5.1 mm. in width; 

 females range from 6.0 to 8.0 mm. in length and from 3.6 to 4.8 mm. 

 in width. The dorsal color varies from green or 3'ellowish green to 

 green with a coppery cast, but the coppery color is never as pronounced 

 as in canadensis and is relatively rare, most of the specimens appearing 

 green or yellowish green. There is some variation in the prominence 

 of the tubercles and the size of the punctures. Even though faint, the 

 the tubercles are always present and the pronotal punctures generally 

 are large, distinct even basally, and usually separated by no more 

 than 1 to 2 diameters. The dorsal setae var}^ slightly in length but 

 are always erect and prominent. The clypeal carina in the male 

 majors varies in degree of development, but the carina is always ele- 

 vated, at least medially. In the females the frontal carina of the 

 vertex is not as constant, usually being shghtly lower medially, but 

 with numerous exceptions. 



Despite the variation, the subspecies pseudorpiheus can be separated 

 from the other forms of orpheus by its very distinct dorsal setae with 

 usually distinctly tuberculate pronotum and elytra, by the medially 

 elevated clypeal carina of the male majors, and by the medially slightly 

 depressed frontal carma of the females. It can be separated from 

 other species of Onthophagus by the specific characters listed under 

 orpheus orpheus (p. 47). 



Little is known about the subspecies pseudorpheus. In general it 

 appears to be a prairie form unlike the other subspecies which are wood- 

 land forms. Onl}^ two specimens have been associated with any ani- 

 mals and these were taken from the nest of a mouse, Microtus ochro- 

 gaster (Wagner), 



