DYNASTIN^E 167 



5 Pygidium (9 ) impressed at the middle of the lower margins. Body 

 oblong, convex, polished and very shining, black, the legs slightly 

 less black; head large, distinctly more than half as wide as the pro- 

 thorax; front rather strongly but not densely punctate throughout 

 the width; clypeus very transverse and strongly trapezoidal, sparsely 

 rugulose, sloping laterally, punctulate latero-basally, the angles 

 rounded; apex sinuato-truncate; edges sharply reflexed and even 

 throughout; suture rectilinear, deep; antennae and mentum nearly 

 as in the preceding; prothorax nearly three-fourths wider than long, 

 the sides broadly arcuate, gradually more converging from rather 

 behind the middle; punctures very fine and remote throughout; 

 scutellum nearly smooth; elytra a third longer than wide, a fourth 

 wider than the prothorax, the sides rather strongly, subevenly 

 arcuate, not at all more prominent at the middle, the edges thick, 

 thinner apically, having just within, at about basal fourth, a rather 

 distinct canaliculation; punctures excessively minute and sparse, 

 almost obsolete; pygidium strongly convex, polished, the punctures 

 fine and remote, becoming rather coarse but shallow and close-set 

 laterally; hind tarsi rather thick, much shorter than the tibiae; apex 

 of the prosternal process strongly bulbose. Length (9 ) 20.0 mm.; 

 width 10.3 mm. Mexico (Durango City), Wickham. 



*laevissimus n. sp. 



Pygidium (9 ) not impressed at the lower margins; body smaller in size 

 though nearly similar in color, sculpture and habitus 6 



6 -Head notably large in both sexes, much more than half as wide as the 

 prothorax, finely, sparsely punctate; clypeus as in the preceding but 

 with the oblique sides rather more arcuate and the obtuse apical 

 angles less broadly rounded, the apex deeply sinuato-truncate, the 

 edges sharply reflexed; suture fine, almost, rectilinear, sometimes 

 feebly angulate at the middle; prothorax two-thirds to three-fourths 

 wider than long, as in the preceding but with the sides more parallel 

 and less anteriorly converging, broadly, evenly rounded; punctures 

 everywhere remote and extremely small, sometimes gradually more 

 distinct laterad; scutellum sharply ogival, perfectly smooth; elytra 

 as in the preceding but not quite so elongate, very little wider than 

 the prothorax, more dilated posteriorly in the male and there much 

 more exceeding the prothorax in width, the sides arcuate, very 

 slightly more prominent medially in the female; punctures sparse 

 and very fine, having the usual arrangement, sometimes almost 

 completely obsolete; pygidium (9) less convex than in lamssimus, 

 with the feeble, sparse and shallow punctures smaller, sometimes 

 much more distinct toward the ends but never so coarse or irregular 

 as in the preceding; in the male they are notably coarser than in the 

 female, irregularly distributed but sparse; smaller ramus of the 

 larger anterior tarsal claw very slender and much shorter than the 

 larger part of the claw. Length (i cf , 6 9 ) 16.0-19.0 mm.; width 

 8.4-9.8 mm. Arizona (Huachuca Mts. and other unrecorded parts). 



[ Chalepus obsoletus Lee.] obsoletus Lee. 



A Nearly similar to obsoletus but with the head noticeably smaller, 

 only about half as wide as the prothorax, the clypeal angles more 



