OF NATURAL HISTOIIY. 663 



polcte indentation in the uiiiMlo of the lateral mar^^in ; lateral 

 margin decur^red, the edgitiir lini- hardly jirominent, »o that, 

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

 almost rouiid<Hl : posterior edj^ini; line hardly visible : seutel 

 small : elytra minutely punctured ; pectus and postpectus dark 

 ferrufjinous. 



Iieni;th about seven-tenths of an inch. 



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

 for the P. hrunni UA of authors, but it differs in niany 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 beinj; very 

 larj^^e and remote from the other, so that when the mandibles arc 

 closed, an oval interval appears, as in the /i-rrwjhwa Sturm., 

 which species, however, has the posterior anj^les of the thorax 

 very obtusely rounded. The J', hninina lias three subc<|ual, 

 subequidistant teeth in the mandibles; the head and thorax <tb- 

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



The species is rare. [193] 



I'liio.N rs. 



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

 sippi. 



31()m:ili:.ma Say. 



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

 tubercles. 



Inhabits Mexico. 



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

 antcnnjc : antennae nearer to each other than to the eyes ; first 

 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 ti]», 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 i)lace it in the present genus, although the ajiproxima- 

 tion of the antennae is an obvious distinction. 

 1^;3.3.] 



