412 CASEY 



of Jiinebris also possesses a structure which is unique as far as 

 known, but which may be a malformation, the epistomal lobe, 

 instead of being large and projecting, is very small, not more 

 than a third as wide as the front, the front being equally trilobed 

 and deeply bisinuate, the central lobe projecting but slightly 

 beyond the lateral ; there is no indication of this peculiar struc 

 ture in the male, so that it may be accidental in this individual. 

 A^ertus may prove to be a species distinct from seculor^ but, as 

 it is founded upon a single specimen and resembles that species 

 considerably, I deem it more prudent to regard it as subspecific 

 for the present. Caiialicidahts is represented before me by a 

 very large series, giving a good opportunity to observe the limi- 

 tations of intraspecific variability, and it may be stated that this 

 inconstancy is very pronounced in color, lustre, development of 

 the thoracic ridges of the female, and depth of the impression 

 between them, well developed to obsolete impressed lines of the 

 elytra and in some other characters ; a very large series col- 

 lected at Alpine, Texas, by Mr. Wickham, is particularly useful 

 in this study. It is highly probable that these extreme variations 

 may indicate some well defined subspecies, but the material at 

 hand is not sufficient to confirm this surmise. This species is 

 said, by Say, to occur also in Pennsylvania, but he doubtless con- 

 founded arundinis with his western species, as the true canalic- 

 ulatus does not occur east of the looth meridian. I cannot find 

 the species described above under the name obsolescense among 

 those made known by Mr. Champion in the " Biologia," and 

 conclude that it is abundantly distinct, its closest all}-^ apparently 

 being rorulenttis Champ. 



Metopoloba n. gen. 



In this genus the body is elongate, fusiform and nearly sim- 

 ilar in the sexes, much as in I^obometop07i, differing superficially 

 in its polished, subglabrous, sparsely and more coarsely sculp- 

 tured integuments, prominent supra-orbital carin^e, not so much 

 larger in themselves but rendered very prominent by reason of 

 the broad, deep grooves bounding them internally, in the much 

 less prominent and generally obsolete apical angular projections 

 of the prothorax and in having the tarsi spinose beneath, the 



