82 MISC. PUBLICATION 4 7 0, IT. S. DEPT. OF AGRICULTURE 



coarsely serrate ; basal depresssions broad and deep ; humeral depressions broad 

 and shallow; surface glabrous, densely, coarsely, uniformly punctate. Each 

 elytron with four longitudinal costae ; first distinct, strongly elevated posteriorly, 

 parallel with sutural margin ; second and third short, the latter interrupted by 

 third fovea; fourth slightly indicated anteriorly, distinct posteriorly, following 

 outline of lateral margin ; with four densely punctured, depressed, yellowish- 

 cupreous f oveae ; first in basal depression ; second in front of middle, interrupting 

 second costa ; third at apical third, interrupting third costa ; and fourth at 

 apical fourth between first and second costne. 



Abdomen beneath coarsely, sparsely fossulate-punctate, except along anterior 

 and posterior margins of sternites, sparsely clothed at sides with recumbent, 

 whitish hairs, with distinct, smooth, elevated, lateral callosities, intervals 

 vaguely granulose ; last visible sternite longitudinally carinate. bimarginate 

 at apex, with median tooth obtusely rounded, subapical ridge dentate, and with 

 a serrate submarginal ridge, lateral margins strongly serrate; eighth tergite 

 narrowly, angularly or semicircularly emarginate at apex, strongly, longitu- 

 dinally carinate at middle, deeply depressed on each side of carina, the surface 

 coarsely, densely punctate. Prosternum coarsely, deeply, rather densely punc- 

 tate at sides, smooth at middle, sparsely clothed at sides with long, recumbent, 

 whitish hairs, the anterior margin broadly rounded, with a short, broad, median 

 lobe. Anterior femur with a broad, obtusely rounded tooth, which is coarsely 

 dentate on outer margin : posterior femur not dentate on outer margin. Anterior 

 and middle tibiae feebly arcuate, unarmed ; posterior tibia straight. 



Length 17 mm., width 6.5 mm. 



Redescribed from the female type, No. 2688, in the Museum of 

 Comparative Zoology, Cambridge, Mass. 



Male. — Differing from the female in having the head bronzy green, more 

 rugosely punctured and more densely pubescent, and with two vague callosities 

 on front, the antenna bronzy green, with the outer tips of the segments yel- 

 lowish, the prosternum more densely pubescent, the last visible sternite shorter, 

 semicircularly emarginate at apex, but not longitudinally carinate, the eighth 

 tergite slightly emarginate at apex, sparsely, coarsely punctured, but not lon- 

 gitudinally carinate, and the anterior and middle tibiae strongly arcuate, the 

 former armed with about five small teeth on inner margin. 



Type locality. — Colorado Biver near Gila, Ariz. Type simply 

 labeled with a silver disk. The type locality given by Chamberlin 

 (1926) as Texas is incorrect. 



DISTRIBUTION 



From material examined : 



Arizona: Many localities. 



California: Los Angeles County (D. W. Coquillett). Yuma (H. F. Wickham). 

 Death Valley and Panamint Valley, April 1891 (A. Koebele). Acme, August 

 8, 1918 : Furnace Creek Ranch, Death Valley, August 16, 1918 ; Indio, River- 

 side County. September 17, 1922 (Rehn and Hebard). 



Lower California: Santa Rosa (G. B5yer). 



Mexico: Puente de Ixtla, July 190O (C. C. Deam). Reynosa, May 20. 1895. 



New Mexico: Alamogordo, May 16, 1902; Silver City, October 21, 1935 (R. T. 

 Kellogg). 



Texas : Many localities. 



Hosts. — Wickham (1898) collected the adults on huisache {Acacia 

 farneisana (Linnaeus) Wildenow) at Brownsville. Tex., and the 

 adults have been reared from palo verde (Cercidium torreyanum 

 (Watson) Sargent) and mesquite (Prosopis fuMflora (Swartz) De 

 Candolle). 



The sculpture is rather constant, but the color varies from olivaceous 

 brown to a bright reddish cupreous, and the f oveae on the elytra from 

 green to yellowish cupreous. The smooth spots on the front of the 

 head are sometimes absent, and the clypeus is either arcuately or 

 angularly emarginate in front. The pronotum is usually widest at 



