OF NATURAL HISTORY. (5Q3 



polete indentation in tlie middle of the lateral margin ; lateral 

 margin decur^ed, the edging line hardly prominea\ L that, 

 when viewed from above, it is not visible- posterior angles 

 almost rounded : posterior edging line hardly visible : scutel 

 small :^ elytra minutely punctured ; pectus and postpeetus dark 

 ferruginous. 



Length about seven-tenths of an inch. 



This species, by its size and color, may be readily mistaken 

 for the P. hruHuem of authors, but it diflFers in many characters. 

 It has a more slender thorax, which is not wider than the head. 

 The teeth of the mandibles are but two, the basal one being very 

 large and remote from the other, so that when the mandibles are 

 closed, an oval interval appears, as in the ferruginea Sturm., 

 which species, however, has the posterior angles of the thorax 

 very obtusely rounded. The P. hrunnca has three subequal, 

 subequidistant teeth in the mandibles; the head and thorax ob- 

 viously punctured, the latter broader than the head, &c. 



The species is rare. [193] 



PEIONUS. 



P. DASYSTOMUS nob. — Occurred near Natchez, on the Missis- 

 sippi. 



MONEILEMA Say. 



M. INEQUALIS. — Cinereous ; rough, with elevated points and 

 tubercles. 



Inhabits Mexico. 



Body pale, brownish-cinereous : eyes small, distant from the 

 antennae : antennae nearer to each other than to the eyes ; firgt 

 joint robust, longer than the second and third together; half the 

 length of the body : thorax cylindric-oval, covered with small, 

 unequal, irregular elevations : elytra with many elevated tuber- 

 cles, of which some form a regular arcuated series from near the 

 humerus to the tip, and parallel with the suture beyond the mid- 

 dle ; tip entire, as long as the abdomen. 



Length seven-twentieths of an inch. 



Inasmuch as this species is apterous and has a similarity of 

 habit, I place it in the present genus, although the approxima- 

 tion of the antenuEB is an obvious distinction. 

 1835.] 



