830 Goleopterological Notices, VL 



elongate, the second less elongate, three to seven short, graduall3^ 

 wider, the club thick, oval, densely pubescent and four-jointed. 

 Mandibles stout, emarginate and bidentate at apex, the lower lobe 

 the longer and larger. Mentum trapezoidal, rather longer than 

 wide, not concealing the maxillary cardo ; gular peduncle long, 

 narrowed at base. Prothorax without ocular lobes. Anterior 

 coxae large, prominent, contiguous, the prosternum before them 

 short, sinuate and unimpressed ; middle coxre narrowl}' sep- 

 arated, the posterior also api)arently rather approximate. Abdo- 

 men flat, the two basal segments each as long as the third and 

 fourth together, the dividing suture moderately coarse and broadl}' 

 angulate ; fifth rounded and nearl3' as long as the two preceding 

 together,; posterior sutures coarse and straight. Legs well de- 

 veloped, the femora not clavate, with a small erect denticle beneath 

 beyond the middle; tibiae stout, longitudinally fluted, denticulate 

 within near the middle, the apex obliquely truncate with a double 

 outer edge and a strong internally projecting terminal spur; tarsi 

 stout, densely pubescent beneath, the first three joints rather 

 short, the last long; claws stout, completely connate in more 

 than basal half. 



This singular genus is assigned to the Phytonomini onl}- pro- 

 visionally and for convenience, for it probably represents a distinct 

 though closely allied tribe. The peculiar dentiform prominence 

 at the sides of the elytra behind the base is suggested in a species 

 of Listronotus, described above in order to bring out this chai'acter, 

 and the beak with its scrobes and the formation of the prosternum 

 are all strongl^^ suggestive of that genus. 



The two species before me may be distinguished as follows : — 



Body stout, the elytra with two apical areas of dense pubescence, the promi- 

 nences at the summit of the declivity also densely pubescent. 



paliidatiis 



Body uiuch smaller and less robust, the elytra without the a])ioal pubescent 



areas, the prominences at the summit of the declivity not pronounced and 



scarcely more densely pubescent a riiiatus 



The genus Plectromodes is probably confined to the United 

 States east of the Kocky Mountains, extending into the northern 

 parts of the Sonoran province, but not forming an element of the 

 tropical Mexican fauna. 



P. paliidatiis n. sp. — Broadly oval, strongly convex, black and polished 

 throughout; pubescence consisting of sparse suberect white hairs, moderate in 



