REVISION OF GENUS EUCERCERIS CRESSON 57 



Dakota). Koeberlinia spinosa (New Mexico). Lepidium sp. (Arizona, 

 New Mexico). L. montanum (New Mexico). Melilotus sp. (New 

 Mexico). M. alba (Nebraska). Farthenium incanum (Mariola) (Arizona, 

 New Mexico). Petalostemum sp. (Nebraska). Polygonum sp. (Arizona, 

 New Mexico). Sartwellia mexicana (New Mexico). Solidago sp. 

 (Colorado, Nebraska). Tamarix gallica (New Mexico, Oklahoma, 

 Texas). Telesperma megapotamicum (Arizona). Xanthoxylum Clava- 

 Herculis (Texas). 



29. Eucerceris ruficeps Scullen 



Figures 35, 87 a, b, c, d, e, f 



Eucerceris ruficeps Scullen, 1948, pp. 159, 175-176, ? figs. lOA, B, C, 14; 1951, 

 p. 1012.— Linsley and MacSwain, 1954, pp. 11-14.— Krombein, 1958, p. 197; 

 1960a, pp. 78-79. 



Figure 35. Southwestern U.S. E. ruficeps Scullen 



At the time the female was' described in 1948 the male of E. ruficeps 

 ScuUen was unknovsTi. The male is described here. By error the holo- 

 type and paratypes were indicated as "males." 



Male, — ^Length 10 mm. Black with Hght yellow markings; puncta- 

 tion normal; pubescence short. 



Head one fourth wider than the thorax, black except for the entire 

 face and small narrow patches back of the eyes; small black patches 

 appear above the antennal scrobes; three subequal denticles on the 

 margin of the medial clypeal lobe; mandibles without denticles; 

 antennae normal in form. 



Thorax black except for the pronotum, a divided band on the 

 scutellum, the metanotum, large patches on the propodeum, and 

 most of the pleuron and ventral surfaces, all of which are light yellow; 



