ISCHIODONTUS. 323 



infuseate. In some of the smallest males the elytra are more parallel towards the base. 

 The ferruginous or pitchy-red under surface and legs and lighter elytral pubescence 

 distinguish I. atricornis from /. erythroderus, Cand. One of the varieties is coloured 

 like /. posticus, Cand., but that species has the thorax black, the hind angles excepted, 

 and the antennse ferruginous. The insect is exceedingly variable in size and colour. 

 Some Guatemalan specimens of this species are labelled I. picipennis, Cand., in the 

 Janson collection, a name used by Steinheil for another member of the same genus. 

 In Guatemala /. atricornis appears to be confined to the Pacific slope. 



12. Ischiodontus thoracicus. 



Ischiodontus thoracicus, Cand. Monogr. Elat. ii. p. 112 \ 



" Niger, sparsim longe fulvo-pubescens ; fronte prominula ; prothorace rufo-sanguineo, longitudine latiore, a 

 basi attenuato, insequaliter fortiterque punctato ; elytris parallelis, punctato-striatis ; corpore subtus 

 pedibusque rufescentibus. — Long. 10, lat. 2| millim." 



Hab. Mexico (Klingelhbfer 1 ). 

 Described from a single example. 



13. Ischiodontus Chiriquensis. (Tab. XIV. figg. 10, 6 ; 10 a, genitalia, 6 .) 



Elongate, narrow, moderately convex, sbining ; piceous or pitchy-brown, the hind angles of the prothorax, and 

 sometimes the basal and apical margins also, ferruginous, this colour in a few examples extending to the 

 greater part of the surface, leaving a transverse median fascia only infuseate, the suture usually reddish- 

 brown ; the antennse black or pitchy-brown, the legs testaceous or obscure testaceous ; above and beneath 

 somewhat thickly clothed with long fulvous or fulvo-cinereous hairs. Head densely, rather coarsely 

 umbilicate-punctate, deeply triangularly depressed in front in the male, shallowly so in the female ; the 

 frontal carina prominent, rounded anteriorly ; the eyes large and smooth ; antennae more than half the 

 length of the body in the male, much shorter in the female, the joints from the third moderately widened, 

 becoming narrower outwards, 3 and 4 equal. Prothorax broader than long, moderately convex, the sides 

 converging from the base, almost parallel in front in the male, slightly rounded in the female ; the hind 

 angles acute, strongly divergent in the male, moderately so in the female, carinate above ; the surface 

 sparsely, finely punctate, deeply canaliculate behind. Elytra moderately elongate, narrowing from about 

 the middle in both sexes, but more parallel in the female ; finely punctate-striate, the interstices feebly 

 convex at the sides, fiat on the disc, and sparsely punctured. Beneath rather sparsely punctate ; pro- 

 sternal sutures deeply excavate in front ; mesosternum declivous ; posterior coxal plates triangularly 

 widened opposite the point of insertion of the femora. 



Length 8-9|, breadth 2-2| millim. ( tf $ .) 



Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet {Champion). 



Collected in abundance on the slopes of the Volcan de Chiriqui. Allied to I. anceps, 

 I. nigricomis, &c. ; but much smaller and more parallel, the antennae shorter and with 

 the joints from the third much less widened, the punctures on the head coarse and 

 umbilicate, the hind angles of the thorax divergent and acute, the coxal plates less 

 widened opposite the point of insertion of the femora. Two specimens from Bugaba 

 differ from those described in having the hind angles of the thorax obtuse at the tip 

 and scarcely divergent. The species is not known to Dr. Candeze. 



2T2 



