NATURAL SCIENCES OF PHILADELPHIA. 205 



contiguous, (separated by a very narrow prosternal prolongation only in 

 Malacosoma;) the margin of the body not foliaceous, and the last joint 

 of the tarsi extending beyond the lobes of the third joint. Lacordaire (Mon. 

 Col., subpent. i., li.) states that the ungues are always appendiculate, but in 

 several of the genera they are cleft, and in the new genus Monoxia they 

 are quite simple and acute. 



The group of genera which will now occupy our attention is distinguished 

 by the hind thighs not being thickened. They do not therefore possess the 

 power of leaping which is observed in Haltica and its allies. 



I have not recognized the following species : 



Galeruca dors at a Say, Journ. Acad. Nat. Sci., iii. 456 ; ed. Lee, ii. 221. 



Galeruca puncticollis Say, ibid., iii. 458; ed. Lee, ii. 222. Perhaps 

 a species of Monoxia. 



Galeruca f u r c a t a Oliv., vide Cerotoma. 



Galeruca atomaria Fabr., Syst. El., i. 490. Carolina; probably a 

 species of Monoxia. 



Galeruca salicis Randall, Bost. Journ. Nat. Hist., ii. 31. Maine, on 

 willow ; probably a species of Monoxia. 



Galeruca femoralis Meis., Proc. Acad. Nat. Sci. Phila., iii. 161. Ap- 

 pears to be a specimen of the European G. c a pr e se , and has, like several 

 others in the Melsheiiner collection, been erroneously regarded as native. 



The genera represented in our fauna may be thus tabulated : 



I. Claws with a broad basal dilatation : 



Antennae with the 1st joint very long, and the third 



longer than the 4th Cerotoma. 



Antenme with the 1st joint moderate : 



Front coxae separated by prosternum Malacosoma. 



Front coxae contiguous : 



Elytra not margined at the sides Phyllobrotica. 



Elytra distinctly margined : 



Epipleura not extending to the tip : 



Last joint of maxillary palpi small, subulate Phyllecthris. 



Last joint of maxillary palpi conical, acute Luperus. 



Epipleurae extending to the tip : 



Upper margin of epipleurae thick, obtuse Agelastica. 



Upper margin of epipleurae very sharp, prominent Gastrogyna, n.g. 



II. Claws cleft or acutely toothed : 



Tibiae with a deep groove on the outer side Ccelomera. 



Tibiae not sulcate externally : 



Front carinated between the antennae Diabrotiea. 



Front flat, with a median impressed line : 



Epipleurae extending to the tip , , Galeruca. 



Epipleurae not extending to the tip Trirhabda, n.g. 



III. Claws acute, usually entire Monoxia, n.g. 



CEROTOMA Chevr. 



The greater length of the first joint of the antennae easily distinguishes this 

 from the other genera. The body is rather robust and convex, glabrous 

 above, with the thorax not impressed, and the epipleurae well defined, ex- 

 tending nearly to the tip of the elytra, which are finely punctured. Erichson 

 (Wiegm. Arch. 1847) describes the ungues as bifid ; they are, however, appen- 

 diculate in our species. 



1. C. c a m i ne a Dej., Cat. 403. Crioceris caminea Fabr., Syst. El., i. 459. 

 Galeruca cam. Oliv., Ent. vi. 656, (No. 93, 72,) pi. 5, f. 73. 



Southern, Middle and Western States ; varies with the elytra destitute of 

 the usual marking, the suture and scutellar region alone being dusky. 



1865.] 14 



