140 Rev. II. Clark on Species o/Phytophaga 



3^ et 4" et 5*' retinentes, sed compressi, et incrassati. Palpi maxil- 

 lares elongati, articulo ultimo producto, et apice acuminato, haud ut 

 in genere Corynode truncato. Thorax subcylindricus, transversus, 

 ad latera marginatus. Scutellum subcordiforme, satis magnum. 

 Elytra thorace latiora, parallela, subcylindrica, convexa, latcribus 

 versus apicem approximantibus, marginatis, et in $ apice ipso un- 

 dique tubereulatis. Elytra in J Isevia, in $ vehementer tuberculata. 

 Pedes robusti, tibiis ad apicem dilatatis, tibiis posticis ad apicem intus 

 canaliculatis : unguiculi appendiculati. 

 Typus Corynoeides tuberculata, 



Althougli the genus CorynodeSy as laid down by Mr. Marshall 

 in his excellent paper in the Journal of the Linn. Soc., contains 

 evidently within its limits forms which vary considerably among 

 themselves in the degree of the dilatation of the antennse (and 

 also, to a less degree, in the amount of development of the inner 

 claw of the unguiculi), I have no doubt whatever that the fol- 

 lowing species constitutes the basis of a quite separate though 

 adjoining genus. In the first place, there is a most remarkable 

 difference of form in the antennse of the two sexes : those of the 

 ^ are hardly, if at all, compressed as in CorynodeSy but are 

 robust and generally filiform, and approximating in length to 

 that of the whole body ; while those of the ? (though consider- 

 ably longer than in the genus Corynodes) are shorter than those 

 of the Si s^d somewhat compressed and dilated in the apical 

 joints; the eyes are apparently less oblong, more circular, and 

 more manifestly excavated (not sinuate) at their inner margin ; 

 the thorax is not elongate or compressed in front, but transverse ; 

 the elytra are more cylindrical and elongate, less attenuate near 

 the apex ; and, especially, there is in the surface of the elytra a 

 difference of character between the two sexes, which not only is 

 different from the habit of Corynodes, but is almost unique 

 among the whole of the vast and varied group of Phytophaga. 

 In the males the surface is smooth, after the usual type ; in the 

 females, however, the whole elytra are adorned with several 

 well-developed tubercles, obsolete towards the apex, but bold 

 and prominent nearer the base. These special differences of 

 detail, coupled with a generally distinct facies, require us to 

 erect for the beautiful species before us a separate genus. 



C tuberculata, n. sp. 



C. ovalis, elytris in $ tubereulatis, in S simplicibus, punctata, Isete 

 cyanea : caput inter oculos arcuatim impressum, et ad verticem 

 longitudinaliter foveatum ; ad frontem punctatum, cyaneum, infra 

 antennarum basin cseruleum : antennoi in S elongatas, simplices, 

 in $ juxta apicem compressse et breviores ; art. 1-6 cyaneis, 

 7-11 cseruleis : Mor«a? transversus ; latera undique leviter margi- 

 nata apparent, crebre punctata : scutellum subcordiforme, Iseve 



