A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 75 



Female. — Broadly elongate, moderately convex above, rather strongly shining, 

 piceous, with faint bronzy and purplish reflections ; beneath brownish cupreous, 

 with a vague greenish tinge, and more strongly shining than above. 



Head bronzy brown, with two slightly elevated, smooth callosities on front, 

 and a narrow, smooth, longitudinal carina on occiput, the carina bifurcate on 

 vertex; front slightly convex; surface coarsely, confluently, shallowly punctate, 

 densely clothed with long, recumbent, white hairs, intervals finely granulose ; 

 clypeus broadly, semicircularly emarginate in front, with a large triangular 

 tooth on each side of emargination, then truncate externally. Antenna piceous, 

 gradually narrowed to apex ; intermediate segments not compact, about as wide 

 as long, broadly subtruncate at outer margins; third segment nearly as long 

 as following two segments united. 



Pronotum twice as wide as long, narrower at apex than at base, widest along 

 middle; sides strongly sinuate at middle, obliquely converging toward apical 

 angles, arcuately converging toward posterior angles; anterior margin slightly 

 sinuate, with an indistinct, broadly rounded, median lobe ; base arcuately emar- 

 ginate on each side, median lobe strongly produced and broadly rounded ; disk 

 even, regularly convex, without depressions or callosities; surface sparsely, 

 rather coarsely, deeply punctate at middle, transversely rugose on each side. 



Elytra slightly wider than pronotum, nearly twice as long as wide, widest 

 behind middle; sides vaguely diverging from humeral angles to behind middle, 

 then arcuately converging to tips, which are separately broadly rounded ; lateral 

 margins coarsely serrate; basal depressions deep; humeral depressions broad 

 and shallow ; surface glabrous, slightly uneven, rather densely, uniformly 

 punctate, intervals densely granulose. Each elytron with four rather distinct 

 longitudinal costae; first straight, sharply elevated from apex to basal third; 

 second sinuate, extending from base to near apex, slightly elevated basally, 

 strongly elevated and arcuate behind middle; third short, vaguely elevated; 

 fourth following outline of lateral margin, more or less distinct on apical half, 

 obsolete anteriorly; with two indistinct, discal foveae, one at apical fourth 

 between first and second costae, the other more anterior and interrupting third 

 costa. 



Abdomen beneath coarsely, irregularly punctate, sparsely at middle, more 

 densely punctate and transversely rugose at sides, rather densely clothed with 

 moderately long, recumbent, white hairs, with distinct, smooth, elevated, lateral 

 callosities, intervals densely granulose; last visible sternite arcuately rounded, 

 with a small median notch at apex, and with a strongly elevated, serrate, 

 submarginal ridge, lateral margins strongly serrate ; eighth tergite broadly 

 subtruncate at apex, coarsely, deeply, confluently punctate, but not longitu- 

 dinally carinate. Prosternum smooth at middle, coarsely, densely punctate at 

 sides, rather densely clothed with long, semierect, white hairs ; anterior margin 

 broadly, arcuately rounded, but without a distinct median lobe. Anterior femur 

 with a large, acutely triangular tooth, which is dentate on outer margin. 

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



Length 12 mm., width 5.5 mm. 



Kedescribed from the female type, No. 3428, in the Academy of 

 Natural Sciences of Philadelphia. 



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

 cupreous, sometimes greenish on clypeus, more finely, densely punctured and 

 more densely pubescent, the antenna uniformly bronzy green, the last visible 

 sternite broadly, deeply, arcuately emarginate at apex, and the surface broadly 

 depressed at middle, the eighth tergite slightly emarginate at apex, and sparsely, 

 coarsely punctured, the prosternum more densely clothed with longer pubescence, 

 the anterior tibia strongly arcuate, and armed with a small, rounded tooth near 

 apex, and the middle tibia slightly arcuate, and indistinctly expanded at apex. 



Type locality. — Tucson, Ariz. 



DISTKIBUTIOS 



From material examined: 



Akizona: Tucson, August 24 (H. F. Wickham, Henry Edwards). Brush Carrol, 

 reared (G. Hofer, M. Chrisman). Hot Springs, June 24 (Barber and 

 Schwarz). Florence, July to September, 1903 (C. R. Biedermann). 



New Mexico: Alamogordo, May 1902. 



Chamberlin (1926) records it from Ft. Grant and Palmerlee, Ariz.; 

 San Jose del Cabo, Lower California; and El Paso, Tex. 



