90 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Pygidium more extensively aliitaceous; terminal abdominal segment 

 not narrowed apically as in male. 



Variation. — Greatest variation is in the size, intensity, and number 

 of spots on the elytra of both sexes. The larger humeral spots are 

 nearly all distinct, but conceivably some individuals may show none 

 at all. In some, the spots are all quite bright and distinct; in others, 

 they are dim and mdistinct. In greatest development, the humeral 

 spots extend completely across intervals 6 and 7, basally a large spot 

 appears on intervals 3 and 4, and smaller discal spots are found on all 

 except the sutural interval. Forty distinct spots were counted on the 

 elytra of one specimen. 



Type.— USNM 65685. 



Type locality. — Brownsville, Tex. 



Specimens examined. — 57. 



Distribution. — (See fig. 7, p. 59.) Holotype and allotype, Browns- 

 ville, Tex., May 24, 1941, W. Goodpaster (Cartwright coll., usnm). 

 And the following paratypes: 



United states: texas: Brownsville, 20^0?, 39 9, May 24, 1941, W. Good- 

 paster (usnm); 1 9 , Apr. 2 (usnm); 4 cTcT, June 1901 (Schaeffer coll., usnm); 2 

 & cf , May 25, 1939, June 8, 1934, D. J. and J. N. Knull (usnm) ; 1 9 , June 8, 1934, 

 D. J. and J. N. Knull (osu) , 1 c? (usnm) ; 1 cf , 1 9 , May 10, Dury (H. W. Wenzel 

 coll., osu) ; 1 9 , Oct. 9, 1960, cow dung, L. J. Bottimer (ljb) ; 4 cf cf, 2 9 9 , Wick- 

 ham (usnm, cnc); 2 c? cf, 4 9 9 , Apr. 15, 1903 (usnm, cnc); 2 cf cf , 4 9 9 , Apr. 

 12-May 20 (usnm, cnc); 1 cf, 1 9, Nov. 21, 1911, palm jungle in human dung 

 (usnm) ; 1 cf, 2 9 9 , palm jungle, June 1, 1954, H. F. Howden (Howden). 3 9 9 , 

 St. Tomas, Brownsville, Brooklyn Museum Cat. 828 (usnm); 1 c?, St. To mas, 

 Brownsville, Howden coll. (cnc); 3 9 9, Los Borregos, Brownsville, May 24, 

 1904, H. S. Barber (usnm); 1 cT, 2 9 9 i Esperanza ranch, Brownsville, Apr. 4, 

 1903, June 21, July 30, Brooklyn Museum Cat. 820 and 829 (usnm) ; 4 cT cf, 4 9 9 , 

 Lake Corpus Christi State Pk., June 8, 1954, H. F. Howden (Howden) ; 1 9 , south- 

 west Hildalgo Co., May 30, 1947, George B. Vogt (Vogt) ; 1 d", 2 9 9 , Cameron Co., 

 Nov. 2, 1946, George B. Vogt, dung of opossum or raccoon composed of fruit of 

 Condalla obovata Hook (Vogt); 1 9 , Bentsen-Rio Grande State Pk., June 4, 1954, 

 H. F. Howden, horse dung (Howden); 1 cf, no data (usnm). 



Mexico: 1 9, Jalapa, W. Schauss (Robinson coll., usnm). 



Remarks. — Onthophagus schaefferi, 0. landolti texanus, and 0. 

 hopfneri occur together and are frequently confused. They are quite 

 distinct however, and may be separated as follows: In 0. schaefferi 

 the small round reddish or brownish discal spots first show up on the 

 5th elytral interval and the spots never form stripes; the elytral apices 

 rarely show solid yellow, but if so, even then the small discal spots 

 remain well separated; the 8th interval is never solid yellow pos- 

 teriorly. In landolti texanus the 5th elytral interval never shows 

 yellow except rarely at base and apex; yellow stripes frequently 

 develop, the yellow color developing as stripes and not as coalescing 

 round spots; the 8th elytral interval is always solid yellow posteriorly. 



