A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 181 



Figure 75. — -Anterior tibia of male (A), clypeus (B), and last visible abdominal 

 sternite of male (C) and of female (D) of Clwyso'botliHs falli. 



a broad, irregular, smooth callosity, and with two more or less distinct callosi- 

 ties, one anterior and one posterior, on each side toward lateral margin ; surface 

 densely, coarsely, deeply punctate, sparsely clothed toward sides with short, 

 white hairs. 



Elytra distinctly wider than pronotum, nearly twice as long as wide; sides 

 nearly parallel from humeral angles to behind middle, then arcuately converg- 

 ing to tips, which are separately broadly rounded ; lateral margins coarsely ser- 

 rate ; basal depressions broad and deep ; humeral depressions elongate and rather 

 shallow ; disk moderately convex, uneven ; surface glabrous, finely, densely 

 punctate between the smooth spaces and costae. Each elytron with four more 

 or less distinct costae; first distinct, narrow and strongly elevated posteriorly, 

 broader and flatter anteriorly, straight from apex to middle, parallel with sutural 

 margin ; second less elevated and defined, irregular, interrupted at basal third 

 and apical third ; third irregular, slightly indicated at middle ; fourth irregular, 

 slightly indicated, following outline of lateral margin ; all costae joined by 

 irregular, flat, transverse, smooth spaces. 



Abdomen beneath sparsely, finely, irregularly punctate, sparsely clothed with 

 short, erect, inconspicuous hairs, without distinct lateral callosities, intervals 

 obsoletely granulose; last visible sternite semicircularly emarginate at apex, 

 without a submarginal ridge, lateral margins slightly serrate ; eighth tergite 

 thickened at apex, coarsely, sparsely punctate, densely granulose, dorsal margin 

 rather deeply, angularly emarginate at apex. Prosternum coarsely, densely 

 punctate, more or less transversely rugose, rather densely clothed with long, 

 erect, whitish hairs ; anterior margin slightly rounded, without a distinct median 

 lobe. Anterior femur with a broad, obtuse tooth, which is dentate on outer 

 margin. Anterior tibia strongly arcuate, with a broadly rounded dilation at 

 apex, and strongly constricted behind dilation ; middle tibia moderately arcuate, 

 gradually expanded toward apex ; posterior tibia straight. 



Length 11.5 mm., width 4.6 mm. 



Kedescribecl from a male paratype in the United States National 

 Museum from the type locality, kindly donated by Dr. Van Dyke. 



Female. — Differing from the male in having the front of the head purplish 

 cupreous, faintly bronzy in the depressions, more coarsely punctate, and more 

 strongly pubescent, the prosternum more sparsely punctured and less densely 



