A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 113 



Abdomen beneath densely, coarsely punctate, and densely clothed with long, 

 recumbent, white hairs, smooth along anterior and posterior margins of sternites, 

 without lateral callosities, intervals densely granulose ; last visible sternite 

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

 lateral margins serrate ; eighth tergite broadly rounded at apex, coarsely, con- 

 fluently punctate, and vaguely, longitudinally carinate. Prosternum flat, 

 coarsely, confluently punctate, sparsely clothed with moderately long, recum- 

 bent, white hairs ; anterior margin truncate, strongly deflexed, with a distinct, 

 large, broad, median lobe. Anterior femur with a large, obtuse tooth, which is 

 dentate on outer margin. Anterior tibia slightly arcuate ; middle and posterior 

 tibiae straight. 



Length 8 mm., width 3.5 mm. 



Redescribed from the female lectotype, No. 3429, in the Academy 

 of Natural Sciences of Philadelphia. 



Male. — Differing from the female in having the front of the head bronzy 

 green, and more densely, finely punctured, the antenna uniformly bronzy green, 

 the last visible sternite shorter, and slightly more broadly emarginate at apex, 

 the eighth tergite more finely, sparsely punctured, the anterior tibia with a 

 slight dilation at apex, and the middle tibia slightly arcuate. 



Type locality. — Southern Arizona, no definite locality. 



DISTRIBUTION 



From material examined: 



Arizona: Williams, May-July (Barber and Schwarz). Oracle, July (Hubbard 

 and Schwarz). Flagstaff, July (H. F. Wickham). Palmerlee, Cochise 

 County, June 21 (C. Schaeffer). Miller's Canyon, Huachuca Mountains, 

 July 6, 1907 (H. A. Kaeber). Bear Canyon, Santa Catalina Mountains 

 (M. Chrisman). 



It has been recorded in the literature from Texas by different 

 writers, but these records probably refer to acaciae Knull. 



Hosts. — Adults have been reared from white' oak (Quercus arizon- 

 ica Sargent) collected by M. Chrisman in Arizona. Burke (1918) 

 records the species as mining the bark and sapwood of dying and 

 dead limbs of Emory oak (Quercus emoryi Torrey) in Arizona, and 

 Knull (1933) also records it as breeding in the branches of oak 

 (Quercus sp.) in the Huachuca Mountains of Arizona. The adults 

 have been collected on Rocky Mountain white oak (Quercus utahen- 

 sis (De Candolle) Rydberg — synonym Quercus gambelii Nuttall) in 

 Arizona by Barber and Schwarz. 



The sculpture on the dorsal surface of the body is rather uniform, 

 but the color is somewhat variable, with the humeral spots on the 

 elytra ranging from bright red to reddish yellow. The pronotum 

 is usually widest near the apex, with the sides arcuately converging 

 posteriorly, rarely with the pronotum arcuately rounded at the mid- 

 dle. The specimens from Palmerlee and the Huachuca Mountains 

 have the clypeus more deeply, angularly emarginate in front, with 

 the pubescence on the front of the head longer, and the front of the 

 head brownish cupreous in the males. The length is from 6.5 to 

 8.5 mm. 



Horn (1886) described the species from a single female from 

 southern Arizona, but he mentions two other specimens from Texas, 

 which were a little more brilliantly colored than the type. The 

 writer found one of these specimens, which was labeled "paratype 

 3429,"in the Horn collection. This specimen is not axillaris, but the 

 species recently described by Knull as acaciae. 



416206—42 8 



