438 SEKKICOKNIA. 



18. Horistonotus discoideus. (Tab. XIX. fig. 18.) 



Moderately elongate, rather convex, shining, sparsely clothed with fine yellowish-cinereous pubescence ; 

 reddish-brown or brown, the hind angles of the prothorax paler, the head infuscate in one example ; the 

 elytra testaceous or brownish-testaceous, with a large common patch at the middle, and a short marginal 

 stripe opposite to it piceous or pitchy-black, the median patch sometimes extending to the apex or 

 connected laterally with the marginal stripe ; beneath ferruginous, the abdomen, and sometimes the pro- 

 pleurse also, in great part piceous ; the antennae and legs testaceous. Head sparsely, finely punctate ; 

 antennas slender, nearly half the length of the body in the male. Prothorax much broader than long, a 

 little wider at the base than at the apex, rounded at the sides ; the hind angles moderately produced and 

 rather obtuse ; the surface very finely, sparsely, uniformly punctate ; the base sinuate and bi-incised on 

 either side. Elytra suboval, two and one-half times the length of the prothorax, and of the same width 

 at the base ; finely, but rather deeply punctate-striate, the interstices feebly convex, fiat on the disc, and 

 sparsely, minutely punctate. Beneath very finely, thickly, uniformly punctate. Claws rectangularly 

 dilated before the middle to the base. 



Length 4|-6, breadth If -2 millim. ( d $ •) 



Hah. Mexico, Jalapa (Edge). 



Three examples. In coloration this species resembles H. crucifer, Cand., from 

 Brazil, except that the common discoidal patch on the elytra does not extend broadly 

 along the suture to the base; it may be known from that insect, however, by the 

 absence of the long basal sulci on the thorax, and by the thorax and elytra being more 

 rounded at the sides. It is more elongate than H. fasciatus and H. unitinctus. 



19. Horistonotus apterus. (Tab. XIX. fig. 19, s .) 



Short, moderately broad, convex, shining, somewhat sparsely clothed with fine yellowish-cinereous pubescence ; 

 brown or reddish-brown, the base of the elytra indeterminately paler, the front of the head and of the 

 prothorax sometimes reddish, the legs and antennae testaceous. Head thickly, somewhat coarsely punc- 

 tate ; antennae slender, more than half the length of the body in the male, slightly shorter in the female. 

 Prothorax broader than long, a little wider at the base than at the apex, widest at the middle, rounded 

 at the sides, the latter somewhat obliquely converging in front and behind ; the hind angles moderately 

 long ; the surface thickly, very finely, uniformly punctate ; the base sinuate and bi-incised on either side. 

 Elytra oval, twice the length of the prothorax, and of about the same width at the base ; rather deeply 

 punctate-striate, the punctures not very closely placed, the interstices moderately and equally convex 

 throughout, very sparsely, minutely punctate. Beneath closely, finely, uniformly punctate. Claws 

 rectangularly dilated from the middle to the base. Body apterous. 



Length 4|-5|, breadth lf-2 millim. ( J $ .) 



Hah. Guatemala, San Geronimo (Champion). 



Four specimens. This insect resembles H. cleryi (Guer.), from Peru, in size and 

 shape, which also is apterous *, but differs from it in the very fine, uniform punctuation 

 of the thorax. The punctures on the head are coarser than those on the thorax. The 

 elytra are not connate. II. apterus only differs from the genus Coptostethus in having 

 the thoracic carina lateral, instead of inferior. Apterous North-American species of 

 Horistonotus are noticed by Dr. Horn. 



* H. parmenoides, Cand., is another apterous species. 



