HORISTONOTUS. 433 



7. HoristOllOtus truncatUS. (Tab. XIX. figg. 14; 14 «, prothorax.) 



Moderately elongate, not very convex, shining, sparsely clothed with fine yellowish-cinereous pubescence ; 

 pitch}-- or reddish-brown, the anterior angles and the base of the prothorax and the base of the elytra 

 indeterminately rufescent or testaceous ; the antennas ferruginous, the legs testaceous. Head finely 

 punctured, with numerous coarse punctures intermixed ; antennae slender, extending to a little beyond 

 the humeri. Prothorax much broader than long, feebly convex, much wider at the base than at the apex, 

 the sides moderately rounded anteriorly and subparallel behind ; the hind angles rather short and exca- 

 vated above for the reception of the humeri ; the surface closely, very finely punctate, with intermixed 

 scattered coarser punctures, the latter becoming much coarser towards the sides and base, those in the 

 transverse basal depressions very coarse and conspicuous ; the base subtruncate on either side towards 

 the hind angles, without trace of sulci. Scutellum convex. Elytra about two and one-half times the 

 length of the prothorax, and of the same width at the base, slightly flattened on the disc, subparallel to 

 the middle and narrowing thence to the apex, the humeri subangular ; rather coarsely punctate-striate, 

 the interstices feebly convex, flatter towards the suture, and sparsely punctured. Beneath very finely, 

 closely punctate, with coarse punctures intermixed. Claws rectangularly dilated from the middle to 

 the base. 



Length 6, breadth 2 millim. 



Hob. Panama, Bugaba and Caldera in Chiriqui (Champion). 



Two specimens, probably male and female. Very near H. obliteratus, but differing 

 from it in having the thorax subtruncate at the base, with the larger punctures very 

 much finer on the anterior part of the disc, and the coarse ones at the base obsolete, 

 and the scutellum more convex. H. truncatus closely resembles JEsthesopus humilis, 

 and has similar coarse conspicuous punctures at the base of the thorax (those on the 

 anterior part of the disc, however, are very much finer) ; but may be known from it by 

 the simple fourth tarsal joint, the more transverse thorax, the more coarsely punctured 

 elytral strise, &c. 



8. HoristonotUS Sulcifer. (Tab. XIX. figg. 15 ; 15 a, prothorax.) 



Rather short, moderately convex, shining, thickly clothed with fine greyish pubescence ; piceous or pitchy- 

 black, the anterior angles of the prothorax rufescent, the legs and antennas testaceous. Head closely, 

 very finely punctate, with scattered intermixed much coarser punctures ; antennae slender, short, about 

 reaching the hind angles of the prothorax. Prothorax slightly broader than long, considerably wider at 

 the base than at the apex, moderately rounded at the sides, narrowed behind ; the hind angles rather 

 short ; the surface closely, very finely punctate, with scattered intermixed much coarser punctures, 

 canaliculate behind ; the base with a long, oblique, and very distinct sulcus on either side. Scutellum 

 concave. Elytra about twice the length of the prothorax, and of the same width at the base, the sides 

 rounded and rapidly narrowing from a little below the base, and distinctly sinuous before the apex, 

 the apices subtruncate ; deeply punctate-striate ; the interstices convex, almost flat on the basal part of 

 the disc, and becoming about equally costate before the apex, closely, very minutely punctate, with widely 

 scattered coarser punctures intermixed. Beneath similarly punctured. Claws rectangularly dilated from 

 the middle to the base. 



Length 5^-6%, breadth 1^-2 millim. 



Sab. Mexico, Tapachula in Chiapas (Hoge) ; Guatemala, Champerico (Champion). 



Five specimens, apparently including both sexes, all from the vicinity of the Pacific 

 coast. This species may be known from most of the allied forms by the long oblique 

 sulcus on either side of the thorax at the base. The elytra are short and narrowed from 



biol. centk.-amer., Coleopt., Vol. III. Pt. 1, December 1895. 3 K 



