18G ACADEMY OF NATURAL SCIENCES 



vertex and behind the eyes : antennae, third joint rather shorter 

 than the first : mandibles strongly dentate within : thorax broad, 

 anterior lateral margin scabrous, with very crowded, minute 

 punctures ; punctures of the disk sparse ; lateral edge irregularly 

 dentated with very small, obtuse teeth ; an obtuse angle behind 

 the middle : elytra punctured, destitute of elevated lines : post- 

 peetus with short yellowish hair : tibia densely ciliated with yel- 

 lowish hair on the inferior edge. 



Length one inch and three-fifths. 



The specimen, from which this description is taken, is a female ; 

 in general form it approaches P. ci/Undrkus, but the thorax is 

 broader and destitute of spiniform teeth ; the third joint of the 

 antenna3 is obviously shorter than the first, and the tibiae are 

 densely ciliated on the inferior edge. It is probably somcAvhat 

 allied to the P. dentatm of Fabricius, judging from the descrip- 

 tion of that author. 



[A species of Mallodon, afterwards described as M. simjilici- 

 colle Hald. — Leg.] 



LAMIA. 



1. L. ACULiFERA. — Thorax unequal; elytra aculeate, with a 

 white band behind. 



Inhabits Missouri. [330] 



Body blackish-brown, covered with short, prostrate, cinereous 

 hair : head with a double slightly elevated line on the vertex : 

 antennae as long as the body, cinereous, spotted towards the base, 

 and annulated towards the tip with brown : thorax unequal ', a 

 dorsal, rectilinear, elevated line, and two undulated or interrupted 

 ones ; lateral tubercle obtuse, little elevated : elytra unequal, with 

 numerous, elevated, acute points ; behind the middle a white fas- 

 cia broadest at the suture, and edged behind by a black line : tip 

 entire : thighs clavate, spotted, and tibia biannulate with black- 

 brown. 



Length seven-twentieths of an inch. 



This is a common species. I observed it on the banks of the 

 3Iississippi^ Missouri, Platte (Nebraska) and Arkansa. 



[I have placed this and several other species in a genus Lcp- 

 tostt/lus, Jour. Acad. Nat. Sc. 2d ser., 2, 168. — Leg.] 



[Vol. III. 



