214 ACADEMY OF NATURAL SCIENCES 



found : scutel pale reddish-brown : elytra pale testaceous, with 

 striae of punctures, which become obsolete before the tip ; a 

 black, oblique spot near the base of each, and a larger obliquely, 

 quadrate one on the middle ; exterior edge black : feet pale : 

 thighs with a minute angle beneath. 



Length about three-twentieths of an inch. 



It has considerable resemblance to the preceding. 



[Also a Pariu. — Leg.] 



9. C PALLIDA. — Pale rufous : elytra pale testaceous, immacu- 

 late. 



Inhabits Missouri. 



Body very pale rufous ; head obsoletely punctured ; an indented, 

 abbreviated line or spot on the vertex : thorax, punctures small, 

 sometimes obsolete : elytra pale testaceous, with striae of punc- 

 tures which become obsolete before the tip : beneath pale. 



Length three-twentieths of an inch. 



Very similar to C. Q-notata, but is always destitute of spots 

 on the elytra. 



[This and the next belong to Metacliroma , as limited by me, 

 Proc. Acad. Nat. Sc. Phila. 1858, 85. I consider them both as 

 varieties of M. quercatum. — Lec] [447] 



10. C. DUBiosA. — Pale rufous; elytra pale testaceous, with a 

 black suture dilated at base. 



Inhabits Arkansa. 



This species seems to differ from the preceding, only by hav- 

 ing a black suture dilated at base, a black lateral edge on the an- 

 terior half, sometimes obsolete, and a black, basal ventral seg- 

 ment ; the thorax is sometimes obsoletely dotted with black, and 

 in one specimen is a small black spot anterior to the middle of 

 each elytra ; the Q-nofata, A-notata, pallida, and duhioaa may 

 possibly prove to be the same species, exhibiting remarkably dis- 

 tinct variations in the distributions of its colors. Found near 

 the Rocky Mountains. I think it possible that duhiosa may 

 prove to be a variety of Cri/tocephalus canellus Fabr. 



11. C. FAVOSA. — (jreenish, with dilated, profound punctures: 

 antennae black, testaceous at base. 



Inhabits Arkansa. 



Body greenish, with a coppery tinge, with numerous, approxi- 



[A^ol. III. 



