REVISION OF GENTJS EUCERCERIS CRESSON 15 



Smith, Lyon County, Aug. 23, 1960 (J. A. Chemsay); cf, Walker Lake, July 29, 

 1957; WUlow Creek Camp, Charleston Mts., July 1, 1954 (J. W. MacSwain). 

 New IMbxico: 2 9 9 , S. Cienega Peak, Peloncillo Mts., 4,500 ft., Aug. 27, 1937 

 (Rehn, Pate, Rehn) ; 2 9 9 , 2 d^ d', Granite Pass, Hidalgo Co., Aug. 22, 25, 1958 

 Croton sp. (P. D. Hurd); 9, Rodeo, Hidalgo Co., Aug. 7, 1958 (G. B. Pitman); 

 9 , same locality and date (C. G. Moore), cf, same locality, Aug. 23, 1958 (M. A. 

 Cazier); 9 , same locality, July 28, 1963 (Cazier and Mortenson); 9cfc?', same 

 locality, July 29, 1963, Koeberlinia sptnosa (Cazier and Mortenson) ; 4 d^ cT, 18 

 mi. N. Rodeo, Aug, 25, 1958 (G. B. Pitman, R. E. Rice, P. M. Marsh) ; 4 d^ d', 

 same locality and date (R. M. Bohart) ; Texas: d', El Paso, June 23, 1947 (Spieth). 



Prey records: None. 



Plant records: Baccharis glutinosa (Arizona). Chrysothamnus sp. 

 (Nevada). Cleome lutea (Nevada). Croton calif ornicus (California). 

 Dalea polyadenia (Nevada). Eriogonum sp, (Arizona, California, New 

 Mexico, Nevada). Eriogonum inflatum (California). Euphorbia al- 

 bomarginata (Arizona). Koeberlinia spirosa (New Mexico). Lepidospar- 

 tum squamatum (California), Prosopis juliflora (Arizona). Solidago con- 

 finis (California). Tetradymia canescens (Nevada). 



4. Eucerceris atrata, new species 



Figures 4, 62 a, b, c, d, e, f 



Female. — ^Length 13 mm. Body black with creamy white markings, 

 legs largely ferruginous; punctation average; pubescence short. 



Head slightly wider than the thoraz; black except for large eye 

 patches, most of the clypeus, the area between the antennal scrobes, 

 and a large patch back of the eye, all of which are creamy white; 

 clypeal border medially depressed with an angular denticle between 

 the medial and lateral clypeal lobes, above and more mesad there 

 is a smaller denticle, and a cluster of bristles on the meson; a small 

 convex elevation on the medial clypeal lobe; mandibles with one 

 prominent medial denticle and a smaller one more basad; antennae 

 normal in form. 



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

 scutellum, the metanotum, a large patch on the propodeum, a small 

 patch on the pleuron and the posterior lobe of the pronotum, all 

 of which are creamy white; tegulae low and smooth; enclosure smooth 

 except for a medial groove and radiating short ridges medially, 

 otherwise smooth; mesosternal tubercles small but distinct; legs 

 ferruginous except for small spots of white on the fore and mid femora; 

 wdngs subhyaHne except for a Hghtly clouded anterior margin; second 

 submarginal ceU petiolate. 



Abdomen black except a divided band on tergum 1, emarginate 

 bands on terga 2, 3, 4, and 5, and lateral small patches on sterna 

 3 and 4, all of which are creamy white; pygidium with sides con- 

 verging apically to a moderately acute apex. 



