NATURAL SCIENCES OF PHILADELPHIA. 31 



M. Thoracica, sp. n. 



Veiy like M. saponadis in form, size, and sculpture ; but the 

 head, thorax, and legs entirely' red, the thorax also is devoid of 

 the basal line of punctures. L. .16. South Carolina, Florida 

 (Leconte). 



31. guerini, Perbosc, has been found in Sonora, and is easily 

 known by the red thorax with two green spots, and clj'tra blue 

 with a red band. 



Cryptocephalus, Geoff. 



So many species of this genus have been described by Suffrian 

 that I am unable to make a proper table of the species. I hope, 

 liowever, in time, to get a good series revised by him. Tlie gi'oups 

 into which he divides the genus are hardlj" satisfactory, and I 

 have used the J" characters in preference. 



A. First ventral segment with a large plate produced into two 

 acute diverging points behind; prosternum with an acute tubercle 

 between the coxjb. Here belong C. lituratus, Fabr. (from which 

 I doubt the propriety of separating G. lativittis, S. vittatus), C. 

 congestus, Fabr., for7nosus, Mels., detriius, Oliv., sellatus^ Suff. ; 

 also C. sulphur ipennis, Mels., areolatiif^, Suff., maminifer, Newm. 

 egenus, Suff., which appear to me doubtful. 



B. Prosternum with the anterior edge carinate or produced in 

 the J". 



C. Prosternum alike in both sexes. 



G. viUicollis, Lee. appears to me not to differ from G. leucomelas, 

 Suff. 



G. mucoreus, Lee. is very distinct by its pubescent upper 

 surface. 



G. schreibersii, Suff. is also very distinct by the closely rugiilose 

 thorax. 



In the group of very small species at the end of the genus I 

 have recognized G. catariua., Suff., G. aur'atus, Fab. (witli wliieli 

 I unite G. asneolus, Lee, G. chalcojiotus, Mann., G. vir^idis, Hald.) 

 C. afomuH, Suff., G. cJilorizans, nanus, lusciis, pallidicornis, re- 

 main unknown to me. C. gracilis rests on the original Fabrician 

 example of G. parvulus, which is identical with the European 

 species ; as this is the only specimen, and the only species common 

 to the two countries, it seems to me better to omit it. G. Isems 



