AMERICAN COMPONENTS OF THE TENTYRIIN^E 385 



will certainly not apply to the angulate form of the first or the 

 greatly produced acute form of the latter in cavicauda. The 

 above short diagnosis of ■plicatus is taken from a specimen 

 recently sent to me by Mr. Champion, from Almolonga. Dcn- 

 tigcr seems to lose some of the convexity and practically all of 

 the elytral rugosity of the Mexican species, but retains the elytral 

 pubescence in denser patches, as a vestige of the characters 

 developed so strikingly in the more typical forms of the genus. 

 I have not seen it and the description is transcribed from the 

 original. The female of cavicauda has the last dorsal segment 

 very remarkably modified, as in the same sex in some forms of 

 Hylocrinus, of the Eurymetoponini ; this segment is black and 

 densely chitinized, with a very deep median emargination, from 

 the bottom of which projects a slender sagittiform process ; in 

 the male the last dorsal is coriaceous and pale as usual, narrow, 

 with the apex truncate, the penultimate being more broadly 

 arcuato-truncate and with a very small simple median sinus. 

 There is no sexual difference in the modification of the elytral 

 apices, this being one of the most important of the distinguish- 

 ing generic characters. The Mexican hicequalis, of Champion, 

 also belongs to Cyrtonims, without much doubt. 



Lobometopon n. gen. 



This genus is a large one and extends in range from Utah 

 and Kansas, at least to the Isthmus of Panama and probably 

 further, although replaced to a large extent by Ef (tragus, and 

 some other allied genera, in South America. The species are 

 evenly elongate-oval in form, evenly convex and either uni- 

 formly pubescent or glabrous, with the eyes large but flattened, 

 finely faceted and with very feebly developed supra-orbital carinas, 

 the lateral lobes of the front never separated from the median 

 parts by more than a feeble depression, the apical angles of the 

 prothorax always anteriorly prominent and the elytra gradually 

 acutely ogival toward apex. The upper line of the epipleurai 

 extends to the sutural angle, which is usually unmodified but 

 sometimes feebly mucronate, apparently more especially in the 

 female ; the elytra sometimes have broadly and feebly impressed 

 lines, particularly toward the suture, and, toward tip, two or 



