HOEISTONOTIJS. 431 



more sinuate at the sides behind, and the elytra more finely punctate-striate, the 

 interstices feebly convex or almost flat from the base to the middle, the alternate ones 

 slightly costate before the apex ; the antennae are also more elongate in the male. The 

 colour is equally variable. 



3. Horistonotus rufiventris. 



Horistonotus rufiventris, Cand. Elat. Nouv. iii. p. 84 (1881) \ 



Hab. Mexico, Cosamaloapan in Vera Cruz (Salle) ; Guatemala \ Cerro Zunil, San 

 Geronimo (Champion) ; Nicaragua (coll. Janson) ; Costa Uica (coll. Janson) ; Panama, 

 Volcan de Chiriqui (Champion). 



Found in numbers at San Geronimo. Very like H. eocoletus, but smaller and less 

 elongate ; the elytra are more gradually narrowed behind, with the interstices convex 

 throughout, the alternate ones costate before the apex. The type has been communi- 

 cated by Dr. Candeze ; it is considerably larger than most of our specimens, the 

 smallest males measuring only 5?? millim. 



4. Horistonotus haemorrhoidalis. 



Moderately elongate, rather slender, narrow, shining, somewhat thickly clothed with yellowish-cinereous 

 pubesence ; piceous or pitchy-black, the anterior margin of the prothorax towards the sides, and some- 

 times the tips of the hind angles also, rufo-testaceous, the humeri and the apical margin of the elytra 

 indeterminately reddish-brown ; beneath paler than above, in some specimens ferruginous, with the sides 

 piceous ; the antennae and palpi testaceous, the legs flavo-testaceous. Head finely punctate, with inter- 

 mixed coarser punctures ; antennae slender, fully half the length of the body in the male, a little shorter 

 in the female. Prothorax about as Jong as broad, moderately convex, considerably wider at the base 

 than at the apex, the sides feebly rounded and converging from the middle forwards, and feebly sinuate 

 and slightly converging behind ; the hind angles moderately produced ; the surface thickly, minutely 

 punctate, with intermixed coarser punctures ; the base sinuate and bi-incised on either side. Elytra 

 about two and two-thirds longer than the prothorax, and a little Avider than it at the base, distinctly 

 rounded at the sides, narrowing from the basal third to the apex, the humeri rounded externally ; deeply 

 punctate-striate, the interstices feebly convex and sparsely punctate. Beneath minutely punctate, with 

 intermixed coarser punctures. Claws bicuspid. 



Length 4f-6J, breadth lf-2f millim. (<?$.) 



Hob. Guatemala, Senahu, San Juan, and Sinanja in Vera Paz (Champion). 



Eight specimens, all from the mountain-slopes in the vicinity of the Polochic valley. 

 This species is allied to H. exoletus, H. rufiventris, Sec, from which it differs in its 

 small size and the non-costiform alternate apical interstices of the elytra. 



5. Horistonotus dilaticornis. (Tab. XIX. figg. 12, tf; 12a, antenna; 12 5, 



prothorax; 12<?, claw.) 



Elongate, rather narrow, convex, shining, finely and sparsely cinereo-pubescent ; testaceous, the apex of the elytra 

 and the last ventral segment slightly infuscate. Head minutely punctate, with much coarser punctures 

 intermixed, broadly depressed in the middle between the eyes, the latter very large, the front declivous, 

 the frontal carina bent downwards in the centre ; antennae more than half the length of the body, the 

 joints from the third opaque and closely punctured, dilated, serrate, and increasing in length, 2 small, 



