A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 89 



Male. — Moderately elongate, slightly convex above, moderately shining, uni- 

 formly dark brown, with a distinct purplish tinge; beneath purplish red and 

 more strongly shining than above. 



Head reddish brown, slightly greenish along lateral margins, with an ob- 

 scure, smooth, longitudinal carina on occiput ; front slightly convex ; surface 

 coarsely, but not deeply, confluently punctate, sparsely clothed with long, re- 

 cumbent, whitish pubescence, intervals densely granulose ; clypeus slightly, 

 broadly, arcuately emarginate in front, arcuately rounded on each side. An- 

 tenna uniformly bronzy green, nearly equal in width to apex ; intermediate 

 segments about as long as wide, broadly rounded at outer margins; third 

 segment slightly shorter than following two segments united. 



Pronotum nearly twice as wide as long, narrower at apex than at base, 

 widest along middle; sides strongly, arcuately converging near apical angles, 

 subparallel along middle, slightly converging posteriorly ; anterior margin 

 broadly, arcuately emarginate, without a median lobe; base broadly, arcuately 

 emarginate on each side, median lobe truncate in front of scutellum ; disk 

 moderately convex, with an indistinct, longitudinal, median depression ; surface 

 finely, uniformly punctate at middle, confluently punctate at sides. 



Elytra at base slightly wider than pronotum, nearly twice as long as wide ; 

 sides nearly parallel from humeral angles to middle, then arcuately converging 

 to tips, which are separately obtusely rounded ; lateral margins strongly serrate 

 posteriorly ; basal depressions broad and shallow ; humeral depressions very 

 shallow ; surface glabrous, finely, densely, uniformly punctate at middle, more 

 densely, coarsely punctate at sides. Each elytron with three longitudinal 

 costae; first straight, strongly elevated posteriorly, obsolete on basal third; 

 second sinuate, extending from near apex to base, strongly elevated posteriorly, 

 interrupted by premedian fovea ; third short, strongly elevated, extending from 

 basal third to behind middle, where it is interrupted by the postmedian fovea ; 

 and with three shallow, densely punctured foveae, one in front of middle, 

 interrupting second costa, one just behind middle, interrupting third costa, and 

 the other between first and second costae at apical fourth. 



Abdomen beneath densely, coarsely, irregularly punctate (punctures more or 

 less elongate), densely, finely granulose, sparsely clothed with long, recumbent, 

 whitish hairs, with distinct, smooth, lateral callosities; sternites broadly, longi- 

 tudinally concave at middle ; last visible sternite with a coarsely serrate, sub- 

 marginal ridge, apex with lower margin transversely truncate, with angles 

 acutely prolonged, upper margin arcuately produced at middle, with lateral 

 margins coarsely serrate; eighth tergite densely granulose, coarsely, sparsely 

 punctate, with upper margin serrate and broadly emarginate at apex and 

 lower margin entire, smooth, and arcuately emarginate at apex. Presternum 

 smooth at middle, coarsely, irregularly punctate at sides, and rather densely 

 clothed with long, recumbent, whitish hairs; anterior margin broadly rounded, 

 but not distinctly lobed. Anterior femur with a rather large triangular tooth, 

 which is coarsely dentate on outer margin. Anterior and middle tibiae arcuate, 

 slightly dilated at apices, the former with a sharp tooth in front of dilation; 

 posterior tibia sinuate. 



Length 12 mm., width 5 mm. 



Redescribed from the male type, No. 42638, in the United States 

 National Museum. 



Female. — Differing from the male in having the head uniformly brownish 

 cupreous, the antenna piceous, with a faint bronzy tinge, the last visible sternite 

 deeply, narrowly emarginate at apex, the eighth tergite deeply, transversely de- 

 pressed at apex, which is produced into a long, curved tooth, fitting into the 

 narrow emargination of the seventh sternite, the anterior tibia unarmed near 

 apex, and the middle tibia straight. 



Type locality. — San Felipe, Lower California. 



DISTRIBUTION 



From material examined : 



Arizona: Hot Springs, June 25-28 (Barber and Schwarz). Tucson, August 

 (H. F. Wickham and J. N. Knull). Sabino Canyon, October (G. Hoferh 

 Base of Pinal Mountains, July 1930 (D. K. Duncan). 



Lower California: San Felipe (G. Beyer). 



Texas: Terlingua, May 25 (J. N. Knuli). 



