TKTRACiONOTES. 



55 



with a short and robust tooth : this bifid claw is, with regard to the 

 relative position of its two members, flexible. The posterior femora 

 are laterally subcompressed, but, when viewed transversely, broadly 

 dilated, at the apex subattenuated. The tibiae (Tab. II. fig. 4g) are 

 considerably shorter than the femora, subincurved throughout, more 

 distinctly at the immediate base ; when seen from behind, the surface 

 is flattened longitudinally (or, in some examples, almost hollowed out) 

 and distinctly marginate ; near the apex this margination is in out- 

 line slightly subsinuate, and terminates in the formation of an apical 

 socket, the edges of which are armed with a row of very minute and 

 short teeth, separate from each other (not close and elongate, as in 

 preceding forms) ; the apex of the socket is prolonged into two ab- 

 breviated spurs. The posterior tarsus (Tab. II. fig. 5 7t) is short and 

 attenuated. I am unable to trace, after much careful examination, 

 any sexual differences in the relative size of the different joints : the 

 basal joint is dilated towards the apex (narrower than the tibia) and 

 broadly truncate ; the second is attenuate, elongate, slightly incras- 

 sated at the apex ; the third is short, almost circular, clothed at its 

 margins and under-side with a thick fringe of stout hairs ; from its 

 centre proceeds the terminal joint, which is elongate and attenuate, 

 gradually dilated into a globose inflation above the apical claw ; the 

 claw is not robust, armed at its inner margin (near the base) with a 

 short and robust tooth. 



Iu general appearance this genus approaches Iihinotmetus — in its 

 subcylindrical elytra and elongated head : its more depressed facies, 

 however, and the abrupt anterior angles of the thorax, will (without 

 other points of divergence) sufficiently characterize it. It approaches 

 closely to Octogonotes in the lateral margin of the thorax ; but from 

 this it is separated widely by the form of the maxillary palpi, its less 

 robust facies, and the elongate (not transverse) form of the thorax. 



1. Tetragonotes elegans. (Tab. II. fig. 3.) 



T. oblongo-ovata, subelongata, punctato-striata, nigra; capite pro- 

 ducts, antice carinato, inter oculos oblique foveolato et carinato, 

 punciato ; thorace elongato, ad latera marginato et ante medium 

 angalato, ad apicem bituberadato, puwtato, nigro ; elytris sub- 

 elongatis, punctato-striatis ; antennis robustis,filiformibus,jlavo- 

 fascis ; pedibus nigris, femoribus ad basin jtavis, tibiisaue posticis 

 pattide testaceis. 



Var. A. Capite et thorace rufis. 



Long. corp. 3 lin., lat. 1 lin. 



Oblong-ovate, subelongate, slightly depressed, punctate-striate, 

 black. Head produced (not so prominently as in the preceding 



