MTOCHEOUS. 175 



Very closely allied to M. denticollis, Say, but differing in the shape of the thorax, 

 which in that species is distinctly broader than long, while in the present one it is as 

 broad as long ; the teeth at the lateral margin are placed rather close. 



The figure is taken from a Mexican specimen. 



3. Myochrous tibialis. (Tab. IX. fig. 8.) 



Elongate, obscure aeneous ; base of the antennae and the tibiae obscure rufous ; thorax cylindrical, as long as 

 broad, three-dentate at the sides ; elytra covered with yellowish scales ; anterior tibiae dentate at the 

 apex. 



Length 2|-3 lines. 



Head closely punctured and covered with yellowish scales ; clypeus broader than long, its anterior margin 

 concave ; labrum obscure fulvous ; antennae distinctly longer than the thorax, the first six joints fulvous, 

 the rest obscure piceous and slightly thickened, terminal joint elongate ; thorax as broad as long in the 

 female, a little narrower and more cylindrical in the male ; the sides distinctly three-dentate, and obliquely 

 cut from the last tooth to the base ; surface rugose-punctate, covered (especially near the sides and at the 

 middle) with yellow scales; scutellum black, without hairs, and with a distinct fovea at the base; elytra 

 closely and distinctly punctate-striate, the interstices (especially near the sides) finely transversely rugose, 

 covered like the thorax, but not very closely, with scales. Underside obscure aeneous or cupreous, punc- 

 tured only at the abdominal segments ; the legs impunctate, and covered, like the rest of the underside, 

 with whitish hairs ; tibiae and tarsi rufous, the anterior pair of the former curved, and with a short tooth 

 near the apex. 



Eab. Beitish Hondueas, Belize, river Hondo (Blancaneaux) ; Guatemala, Panzos, 

 Cubilguitz, Lanquin (Champion). 



Although closely allied to M. denticollis, I believe the present species, of which 

 numerous specimens were obtained at Panzos, to be a distinct one. The thorax 

 is not broader than long, as is the case with J¥. denticollis, and is more rugosely 

 punctured, while the scales covering the upper parts are not grey, but yellow. 

 M. longulus, Lee, is described with the thorax longer than broad and sparingly 

 punctured. 



A Honduras specimen is figured. 



4. Myochrous femoralis. 



Oblong, subdepressed, aeneous ; base of the antennae and the tibiae fulvous ; thorax slightly broader than long, 

 three-dentate at the sides ; elytra regularly punctate-striate, thinly covered with yellowish scales ; ante- 

 rior tibiae toothed near the apex ; posterior femora dilated into a triangular tooth. 



Length 2| lines. 



Hab. Beitish Hondueas, river Sarstoon (Blancaneaux). 



A single specimen (and, as it seems, rather rubbed) was obtained by M. Blancaneaux, 

 which differs from any of its allies by the dilated subdentate posterior femora. The 

 antenna? are distinctly longer than the thorax ; the latter is rather finely punctured ; the 

 elytra show a shallow transverse depression below the base, and are very regularly 

 punctate-striate, without the transverse rugosities seen in M. tibialis. 



