NATURAL SCIENCES OF PHILADELPHIA. 211 



than the thorax, flat and broadly separately rounded at the tip in the female ; 

 punctured in both sexes, with the lateral margin acute, and the epipleurae 

 well defined, extending nearly to the tip. Anterior coxae prominent, conical, 

 contiguous ; tibiae not sulcate externally, tarsi with the last joint as long as 

 the first, ungues wi'h a large obtusely rounded basal dilatation. 



In the male, the antennae are as long as the elytra, which extend a little 

 beyond the abdomen ; wings perfect. 



In the female, the antennae extend to the tips of the elytra, but the abdo- 

 men is enormously inflated, and more than twice the length of the elytra ; 

 wings wanting. 



1. G. insolita. Diabfolicaf insolita Lee , Proc. Acad. Nat. Sc, Phil., 

 1861, 338. 



Cape San Lucas, Lower California ; Mr. Xantus. The head, thorax and 

 elytra are muddy yellow ; the elytra distinctly punctured, with a humeral 

 spot, and another behind the middle black ; the scutellum, tibiae, tarsi, palpi 

 and antennae are black, the thighs testaceous, the postpectus and abdomen 

 blackish piceous. 



CCELOMERA Chevr. 



Erichson (Wiegm. Arch., 1S47) desires to restrict this genus to those 

 species in which the anteunal joints 5 10 are much shorter than the 4th. A 

 more valuable character appears to me to be the deep groove on the outer 

 face of the tibia?, which distinguishes this from all the other genera repre- 

 sented in our fauna. The maxillary palpi are rather stout, with the last 

 joint as long as the preceding, but narrower, subconical, and rounded at the 

 tip. The claws are cleft, with the inner part shorter, but as broad as the 

 outer, and acute at tip. The epipleurae are very narrow, and do not extend 

 to the tip. The body above is glabrous and nearly smooth. 



1. C coryli. % Galleruca cor. Say, Journ. Acad. Nat. Sc. Phil., 3, 455; 

 ed. Lee. ii. 220. 



Middle, Western States, a~d Kansas. Mentioned by Say as feeding on 

 hazel bushes. I have never collected this species, but have received it from 

 several friends. It is easily known by its large size, pale color, with broad 

 basal and subapical bands of a bluish black color on the elytra. The elytra 

 of the male are parallel at the sides, those of the female are considerably 

 dilated from the base for two-thirds the length, then obtusely rounded. In 

 the only male before me, the elytra are longer than the abdomen, and the 

 extremity is longitudinally compressed and elevated ; this is probably an 

 individual deformity. The last ventral segment is deeply cleft in the male, 

 but less so in the female. 



Specimens occur with the dark bands badly defined, and sometimes 

 entirely wanting. 



DIABROTICA Chevr. 



This genus contains small species, with elongate body, glabrous above, 

 and generally nearly smooth, though sometimes with deep elytral striae. The 

 head is marked with a deep transverse impression, or a large fovea, between 

 the eyes, and the front is strongly carinated. The maxillary palpi are not 

 very stout, the last joint is conical, acute, and somewhat shorter than the 

 preceding (but scarcely subulate, as described by Erichson, Wiegm. Arch., 

 1847). The antennae are moderately long, the third joint is sometimes equal 

 to the second, sometimes longer, but both united are not longer than the 

 fourth. The thorax is sometimes even, sometimes deeply impressed each 

 side of the middle. The elytra are sometimes elongate and parallel, some- 

 times convex and ovate ; the epipleurae are well defined, but do not extend to 

 the tip. The legs are slender, the tibiae not sulcate externally, the claws . 

 cleft, the inner part nearly equal to the upper one. 



1865.] 



