NORTH AMERICAN COLEOrTERA. 95 



In the two specimens before me the last ventral segment is exca- 

 vated along its anterior border in a manner similar to that of the 

 pygidium of Atsenius. The material at hand is not suflBcient to 

 enable me to determine whether the character is sexual or not. 



The very sharply defined ridges of the thorax will enable this 

 species to be at once determined, and the chevron-like ridges of the 

 occiput are peculiar to it. 



The ridges of the thorax are said to be four, but are api)arently 

 five, but no count is made of the thickened antei'ior margin of the 

 thorax, the discal ridges are alone counted. 



Occurs from New York southward to Georgia, but seems to be 

 rare. 



Ps. quiiiqucplicatii^i Horn.— Obloug oval, convex, slightly broader pos- 

 teriorly, rufoferrugiiious, feebly shining. Head moderately convex, verrucose 

 in front, the vertex and occiput with obsolete di.stant punctures. Clypeus broadly 

 triangularly emarginate, the angles each side obtuse, the sides oblique, scarcely 

 arcuate, geute obtusely rounded. Thorax one-fourth wider than long, slightly 

 narrowed in front, hind angles obtusely rounded, base feebly arcuate, the mar- 

 ginal line distinct, disc moderately convex with five distinct transverse ridges, 

 the first two entire the others interrupted by a broad median impression, the 

 grooves between the ridges coarsely punctured, a moderately large oval space at 

 the hind angles smooth. Elytra as wide at base as the thorax, humeri slightly 

 dentate, sides feebly arcuate, disc moderately deeply striate, the strise punctured, 

 intervals moderately convex, extremely finely alutaceous, the inner edges ci-enate. 

 Mesosternum opaque, scabrous, not carinate between the coxae. Metasternum 

 with few punctures at sides. Ventral segments with a row of indistinct punc- 

 tures. Posterior femora elongate oval, smooth, a marginal groove posteriorly 

 extending two-thirds to base, posterior tibipe moderately stout, without oblique 

 ridges, but with the three longitudinal series of small acute tubercles, the spurs 

 slender, but not acute at tip, tarsi longer than half the tibite, the first joint elon- 

 gate triangular. Length .14 inch ; 3.5 mm. 



AVhile there are but four discal ridges on the thorax in the pre- 

 ceding species there are five in the present. The last ventral shows 

 no trace of the excavation seen in the preceding species. All the speci- 

 mens studied, seven in number, have the same color. 



The typical specimens in the LeConte cabinet were from the Mex- 

 ican boundary survey and collected by Major Webb, the exact lo- 

 cality unknown. Those in my cabinet were collected by Morrison 

 south of Tucson, Arizona. 



I*s. intorrupf us Say. — Oblong, nearly i)aralle], moderately convex, thorax 

 piceous, head and elytra brown, beneath and legs reddish brown. Head moder- 

 ately closely verrucose. Clypeus bro.adly triangularly emarginate. the angles on 

 each side very o))tuse, sides feebly arcuate, gens very obtuse. Thorax one-half 



