A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 71 



third irregular, interrupted by foveae, and not extending to base or apex; 

 fourth feebly indicated, following outline of lateral margin ; three densely punc- 

 tured foveae, first in front of middle interrupting second costa, second and 

 third at apical third interrupting second and third costae. 



Abdomen beneath coarsely, rather densely punctate, smooth along anterior and 

 posterior margins of sternites, rather densely clothed at sides with long, re- 

 cumbent, whitish hairs, with more or less distinct lateral callosities, intervals 

 densely, finely granulose ; basal sternite longitudinally concave at middle; last 

 visible sternite deeply, semicircularly emarginate at apex, without a sub- 

 marginal ridge, lateral margins serrate; eighth tergite densely granulose, 

 sparsely, coarsely punctate, arcuately emarginate at apex, but not longitudinally 

 carinate. Prosternum flat, coarsely, confluently punctate, more or less rugose, 

 rather densely clothed with long, recumbent, white hairs, with a distinct, long, 

 median lobe in front. Anterior femur with a large triangular tooth, which 

 is coarsely dentate on outer margin. Anterior tibia arcuate, with a small 

 rounded dilation at apex; middle and posterior tibiae straight. 



Length 7.5 mm;, width 3 mm. 



Female. — Differing from the male in having the basal sternite of the abdomen 

 convex at middle, the last visible sternite broadly, shallowly emarginate or trans- 

 versely sinuate at apex, the eighth tergite broadly rounded at apex, longitudinally 

 carinate, and broadly depressed on each side of carina, and the anterior tibia 

 unarmed at apex. 



Type locality. — Sabino Canyon, Ariz. 



Type material. — Type, allotype, and paratypes in the United 

 States National Museum, No. 55293. Paratypes in the collection of 

 J. N. Knull. 



Described from 37 specimens (one male type), as follows: 



Arizona: No definite locality (H. K. Morrison). Sabino Canyon, April to Sep- 

 tember, reared (G. Hofer). Santa Catalina Mountains, June to August, 1914, 

 reared; Redington, August 26, 1915, reared (M. Chrisman). Florence, June 

 24-28, 1903 (C. R. Biedermann). Hot Springs, June 23^28 ; Santa Rita Moun- 

 tains, June 18 (Hubbard and Schwarz). Tucson, August 8, 1916; May 12, 

 1913 (T. E. Snyder, H. F. Wickham). St. Bernardino Ranch, Cochise County, 

 3,750 feet elevation (E. G. Smyth). Palmerlee, Cochise Countv (C. 

 Schaeffer). Yuma, June 11, 1937 ; Wickenburg, June 16, 1937 (D. J. and J. N. 

 Knull). Globe, May 12, 1934; Gila Bend, March 25, 1935 (F. H. Parker). 



Texas: Esperanza Ranch, Brownsville, June 28 (C. Schaeffer). Agua Negra, 

 May 21, 1895. New Braunfels, May 1902 (M. Mittendorf). Brownsville 

 (J. C. Bridwell) . Van Horn, May 23, 1932 (E. G. Linsley) . 



Hosts. — The adults have been collected and reared from mesquite 

 (Prosopis juliflora (Swartz) De Candolle) collected at different locali- 

 ties in Arizona by Hofer, Chrisman, and Hubbard and Schwarz, and 

 the adults have been collected on palo verde (Cercidium torreyanum 

 (Watson) Sargent), at Tucson by T. E. Snyder, and in the Santa 

 Catalina Mountains by M. Chrisman, and this plant may also be host 

 for the species. 



This species is mixed in all collections with debilis, which it resembles 

 very closely, but the longitudinal costae on the elytra, especially the 

 second and third, are usually more distinctly elevated in prosopidis. 

 The males may be readily separated by the quite distinct genitalia, but 

 the females will be more difficult to distinguish. 



In some specimens the head is slightly greenish behind the clypeus, 

 the surface more densely pubescent, and the carina on the occiput 

 usually more or less bifurcate anteriorly. The sides of the pronotum 

 are either arcuately or sinuately convergent posteriorly and the surface 

 of the pronotum more or less irregularly punctured in some examples. 

 Length 6.5-10 mm. 



