358 SEEEICOENIA. 



Allied to H. sordidus (Lee), but considerably narrower, and with the coarse punctures 

 on the thorax more scattered, the elytral interstices more convex. Both insects have a 

 double system of punctuation, above and beneath, this being accompanied by a 

 corresponding difference in the vestiture. A fuller description is given from the ten 

 specimens we have received, these agreeing well with the type communicated by 

 Dr. Candeze. 



3. Heteroderes granulatus. 



Elongate, rather broad, convex, opaque ; brown or blackish^brown, the prothorax with the base on either side, 

 or the inner part of the hind angles, obscure testaceous, the antennse ferruginous, the legs testaceous ; 

 the surface thickly clothed with a short, fine, decumbent fulvo- cinereous pubescence. Head convex, 

 densely, finely punctate, with intermixed coarser punctures, the frontal carina rounded and moderately 

 prominent ; antennae slender, rather short, still shorter in the female, joint 3 nearly twice as long as 2 

 and a little shorter than 4. Prothorax about as long as broad in the male, shorter in the female, 

 narrowed in front, the sides rounded anteriorly and feebly sinuate behind ; the hind angles strongly, 

 triangularly produced, slightly divergent, sharply carinate above, the carina short and joining the marginal 

 one at the tip, and with a short fine oblique ridge extending inwards from the apex of the angle ; the 

 surface very densely, minutely punctate, with scattered intermixed much coarser punctures. Elytra 

 about two and one-fourth times the length of the prothorax, rapidly narrowing from a little below the 

 base, and slightly rounded at the sides, the apices also rounded; finely punctate- striate ; the interstices 

 feebly convex at the sides and apex, flat on the disc, densely, minutely reticulate, and also sparsely 

 granulate, the granular elevations becoming more distinct towards the base. Beneath densely, finely 

 punctate, the prosternum sparsely and somewhat coarsely punctured. Posterior coxal plates very broadly 

 widened inwards. Eourth tarsal joint with a long narrow lobe beneath. 



Length 8£-9|, breadth 2|~2| millim. ( d $ .) 



Hab. Mexico, Presidio de Mazatlan and Ventanas (Forrer). 



Two examples. This insect is closely allied to various South American and Antillean 

 forms, from which it may be known by its convex shape and attenuate elytra, the 

 latter with the interstices distinctly granulate (as well as reticulate) and the apices 

 rounded. The minute interstitial punctuation of the thorax is denser, and the larger 

 punctures finer, than in H. sordidus and H. heterostiocus. 



4. Heteroderes gibbulus. (Tab. XV. fig. 26.) 



Short and robust, broad, rather dull, finely pubescent, obscure ferruginous, the suture of the elytra infuscate, 

 the legs and antenna? flavo-testaceous. Head convex, thickly punctured, the interspaces exceedingly 

 minutely punctate, the frontal carina rather prominent; antenna? scarcely reaching the base of the 

 elytra, joint 3 a little longer than 2, the two together longer than 4. Prothorax convex, as long 

 as broad, narrowed in front and behind, the sides rounded ; the hind angles strongly produced, triangular, 

 acute, not divergent, without distinct carina above ; the surface thickly, rather coarsely punctate, the 

 interspaces exceedingly minutely punctate. Elytra about one-half longer than the prothorax, and 

 narrower than it at the base, rounded at the sides in front and rapidly narrowing from the middle, 

 conjointly rounded at the apex ; deeply punctate-striate, the interstices convex and closely, exceedingly 

 minutely punctate. Beneath sparsely, coarsely punctate, the interspaces closely and very minutely 

 punctured. Posterior coxal plates broadly widened inwards. Legs rather short ; the fourth tarsal joint 

 feebly produced beneath. 



Length 3, breadth 1^ millim. 



Hab. Mexico, Ventanas in Durango (Hoge). 



