METACHEOMA. 171 



3. Metachroma convexa. 



Ovate, convex, fulvous or piceous below ; thorax fulvous, impunctate ; elytra testaceous, punctate-striate, the 

 striae visible to the apex ; legs testaceous. 



Length 2|- lines. 



Head very minutely punctured at the vertex ; the eyes deeply grooved in front of their inner margin ; clypeus 

 nearly twice as broad as long, finely and closely punctured, the anterior margin concave emarginate, 

 obliquely cut at each side; labrum and jaws fulvous; antenna? half the length of the body in the male, 

 shorter in the female, the first five joints fulvous, the rest piceous ; thorax transversely convex, slightly 

 widened at the middle, the anterior angles produced into a very short tooth, surface impunctate, shining 

 fulvous ; scutellum crescent-shaped ; elytra convex, not more than twice and a half as long as the thorax, 

 narrowed towards the apex, testaceous, each elytron with ten rows of moderately deep punctures, which 

 extend to the apex but are much more finely impressed at the latter part ; legs rather short, testaceous. 



Hab. Nicaeagua, Chontales (Janson). 



Only two specimens of this species were obtained by Janson. They differ from 

 M. variabilis in the shape of their elytra, which are more convex, shorter, and more 

 narrowed towards the apex, the punctuation at the same time extending to the end ' r 

 the sides of the thorax are also less rounded, and the legs less robust and shorter. 



4. Metachroma minuta. 



Light fulvous ; antenna? and legs testaceous ; thorax finely and closely punctured ; elytra finely punctate-striate, 

 their apex impunctate. 



Length 1 line. 



Head very minutely punctured ; clypeus distinctly broader than long, remotely and distinctly punctate ; antennae 

 slender, entirely testaceous ; thorax nearly three times as broad as long, the sides greatly widened at the 

 middle and rounded, surface closely covered with minute punctures ; elytra with a short depression below 

 the base, finely but distinctly punctate-striate anteriorly, much more finely towards the apex, the latter 

 entirely impunctate ; below and the legs light fulvous. 



Hab. Beitish Hondueas, Belize (Blancaneaux). 



5. Metachroma mexicana. (Tab. IX. fig. 11.) 



Ovate, piceous or fulvous below ; above testaceous ; thorax impunctate, with a black spot on the disk ; elytra 

 depressed below the base, striate-punctate in the depression only, rest impunctate ; each elytron with a 

 short black streak at the middle of the disk. 



Var. Thorax and elytra without spots. 



Length lf-2 lines. 



Head rather flat, very finely rugose near the clypeus, the latter separated from the face by a semicircular 

 groove ; antennas half the length of the body, fulvous, the terminal joints more or less distinctly piceous ; 

 thorax transverse, the sides much rounded and widened at the middle ; the anterior portion rather deflexed, 

 surface entirely impunctate, with a V-shaped black spot at the middle of the disk; scutellum semicircular, 

 black ; elytra with a distinct transverse depression below the base, the latter somewhat thickened, and 

 longitudinally grooved within the humeral callus, distinctly punctate-striate within the depression only, 

 the other parts impunctate, the suture and a short longitudinal streak below the middle piceous or black. 

 Underside either fulvous or the sides of the breast and the abdomen black ; legs robust, the posterior 

 femora with a very minute tooth ; knees and apex of the tibiae piceous. 



Hab. Mexico, Guanajuato (Duges, coll. SalU), Silao (Salle). 



The impunctate thorax and latter portion of the elytra form the principal marks of 



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