i28 ARCANA NATURyE. 



I hâve extended Arhopalus, Serv., to include ail those species usually classed with Clytus, but which 

 differ from that genus by having the head not deflexed, the front short and oblique, not large and 

 perpendicular as in Clytus, the legs moderate in length and the thighs never clavate nor spinous at the 

 lip. In fact, they approach, in many characters Elaphidion, but differ by the eyes being finely granu- 

 late. The authors of the British Muséum catalogue hâve not adopted this view, which was expressed 

 by me in the Journal of the Acaclemy of Natural Sciences of Philadelphia, 2nd ser., II, 16, and I now 

 avail myself of the opportunity of placing it before the entomologists of Europe for adoption or con- 

 demnation. 



MONILEMA, Syn. 



21. M. ARMATUM, elongatum, nigrum, thorace lœvi, lateribus acute spinosis, apice et basi punctis sub- 

 marginalibus notato; elytris subrugosis, parce grosse punctatis, apice lœvibus, dorso convexis, lateribus 

 subito declivibus. — Long. 27 mill. — ïab. XIII, fig. 2. 



Leconte, Proceedings of the Academy of Natural Sciences of Philadelphia, VI, 234. Texas. This spe- 

 cies is similar in form to the Californian M. semipunctatum, Lee, but is more elongate; the thorax is 

 smoolh on the dise, and the elytra are more punctured and rugous. 



The genus Monilema is confined to the région between the Platte river of Kansas and the mountains 

 of California, and replaces in America Dorcadion of the old world. The species are not numerous, 

 and those known to me may be distinguished as follows : 



A. Elytra coQvexa, rugose punctata : 



1. Thorace lateribus vix armato, punctis basalibus perpaucis noiato; clylris striga postica subtiliter cinereo- 



pubescente • M. annulatum, Say. 



B. Elytra convexa, parce punctata. 



a. Elytra omnino glabra. 



2. Thorace spina laterali armato, parce grosse punctato , elytris antice et late- 



ribus parce punctatis M. SEMIPUNCTATUM, Lee. 



3. Thorace spina laterali armato, punctis basalibus pluribus; elytris parce 



grosse punctatis M. armatum, Lee. 



4. Thorace haud armato, opaco, punctis paucis dispersis; elytris fortiter grosse 



punctatis, magis ovalibus M. crassum , Lee. 



b. Elytra lineis reticulatis albo-pubescentibus. 



5. Thorace spina laterali armato, série punctorum basali notato ; elytris parce 



grosse punctatis M. albo-pictum, White. 



C. Elytra dorso planiuscula, lateribus subito declivibus. 



6. Thorace cylindrico, impunctato; elytris parce punctatis M. appressum, Lee. 



DoRCAJDiON LoEQUiNi, Fairm. is unknown to me and probably belongs also to this genus. 



