A REVISION OF NOIRTH AMERICAN CHRYSOBOTHRINI 145 



moderately long, recumbent, white hairs, intervals vaguely granulose, and each 

 sternite with a smooth, strongly elevated callosity on each side near lateral 

 margin; basal sternite slightly, longitudinally concave at middle; last visible 

 sternite broadly, shallowly emarginate at apex, without a submarginal ridge, 

 but with an acutely angulated, strongly elevated, smooth, lateral callosity on 

 each side near base, lateral margins coarsely serrate; eighth tergite broadly 

 rounded at apex, coarsely, densely punctate, slightly, broadly depressed on each 

 side, and more or less longitudinally carinate. Prosternum coarsely, densely 

 punctate, somewhat transversely rugose, sparsely clothed with long, recumbent, 

 white hairs ; anterior margin with a distinct, broad, rather long, median lobe. 

 Anterior femur with a large, acute tooth, which is dentate on outer margin. 

 Anterior tibia slightly arcuate, unarmed; middle and posterior tibiae straight. 

 Length 9.5 mm., width 4 mm. 



Redescribed from the female lectotype, No. 2701, in the Museum of 

 Comparative Zoology, Cambridge, Mass. 



Male. — Differing from the female in having the antenna reddish cupreous, 

 with the outer margins of the segments more or less yellowish, the last visible 

 sternite more deeply, narrowly, arcuately emarginate at apex, the eighth tergite 

 angularly emarginate at apex, sparsely, finely punctate, but not carinate, the 

 prosternum more densely pubescent, and the anterior tibia armed with a short, 

 obscure dilation at apex. 



Type locality. — Colorado River, Calif. Type labeled with a gold 

 disk and the identification label marked "Col." 



DISTRIBUTION 



From material examined : 



Arizona: No definite locality (H. K. Morrison). Sabino Canyon, April 4-28, 

 reared (W. D. Edmonston and G. Hofer). Santa Catalina Mountains and 

 Redington, reared (M. Chrisman). Carr Canyon, Huachuca Mountains 

 (Horn collection). San Carlos Lake, May (D. K. Duncan). 



California: Colorado River, type (J. L. LeConte). 



New Mexico: Las Cruces (T. D. A. Cockerell). 



Texas: Uvalde, March 30, 1907 (W. F. Fiske). Sanderson, June 10, 1930; Van 

 Horn, May 23, 1932 (E. G. Linsley). 



Recorded in the literature from various other localities in Arizona, 

 California, New Mexico , and Texas, and from Sonora, Mexico. 

 Chamberlin (1926) records it from Colorado, but this probably refers 

 to Colorado River, Calif., the type locality. 



Hosts. — This species mines the bark, sapwood, and heartwood of 

 dying and dead trees. Adults have been reared from mesquite 

 (Prosopis juliflora (Swartz) DeCandolle), and catclaw (Acacia greg- 

 gii Gray) collected in Arizona by G. Hofer and M. Chrisman. 



The color and sculpture on the dorsal surface of the body are rather 

 constant, but the smooth elevations on the front of the head are vari- 

 able in shape. The sides of the pronotum either obliquely converge 

 from near the anterior angles to the posterior angles, or are nearly 

 parallel and sinuate at the middle. Sometimes the segments of the 

 antenna are more or less yellowish along the outer margins and the 

 emargination at the tip of the last visible abdominal sternite in the 

 female is variable in shape. The length is from 8.5 to 12.5 mm. 



Chrysobotkris exesa was described from a female collected by Le- 

 Conte on the Colorado River in California, and another female col- 

 lected by Mr. Schott in Sonora, Mexico. Specimen No. 1 in the Le- 

 Conte collection is a female labeled with a gold disk and "C. exesa Col, 

 Lee.,^ and is selected as the lectotpye. Specimen No. 2 in the same col- 



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