324 SEEEICOENIA. 



14. IschiodontuS anceps. (Tab. XIV. figg. 11, 6 ; 11 a, antenna.) 

 Ischiodontus anceps, Cand. Monogr. Elat. ii. p. 116 \ 



Hab. Mexico \ Puebla, Orizaba, Tuxtla, Cordova, Playa Vicente (Salle), Cuernavaca, 

 Teapa (E. II. Smith), Yautepec, Jalapa, Tapachula (Edge) ; British Honduras, 

 R. Sarstoon, R Hondo (Blaneaneaux) ; Guatemala, Panzos, Teleman, Paniraa, and San 

 Juan in Vera Paz, El Tumbador, El Reposo, Las Mercedes (Champion), Coban (Con- 

 radt) ; Nicaragua (Salle), Chontales (Belt, E. M. Janson) ; Panama, Bugaba 

 (Champion). 



This is perhaps the commonest and most widely distributed species of the genus 

 within our limits. It may be known from most of its allies by the elytra being 

 narrowed from the base in both sexes ; the antennae in the male are very elongate, 

 with the joints from the third broadly widened, becoming narrower outwards. The 

 suture of the elytra is often brownish or ferruginous, the antennas and legs being of 

 the same colour. The head is triangularly excavate in front (in some specimens very 

 deeply) in the male, flattened or slightly depressed in the female. The sexes, as usual, 

 differ greatly in the length of the antennae. The pubescence is yellowish- or fulvo- 

 cinereous. The insect has been found in plenty at Jalapa and also in Guatemala. In 

 a few specimens ( d 1 $ ) from Cordova and Jalapa the head is flattened or feebly 

 transversely depressed in front and the elytra are rather more parallel ; they are 

 apparently varieties of this species. A male from Chontales is figured. 



15. Ischiodontus nigricornis. 



Ischiodontus nigricornis, Cand. Monogr. Elat. ii. p. 116 \ 

 Eab. Mexico, Cordova l , Toxpam (Salle). 



I have seen three specimens only of this species, all females. It is, perhaps, a 

 variety of /. anceps, from which it differs in its infuscate or black antennae. 



16. Ischiodontus balteatus. (Tab. XIV. fig. 12, $ .) 



Elongate, moderately convex, shining ; pitchy-red, the head, antennae, and the sides of the elytra broadly 

 from the base to the apex, black, the black on the elytra gradually extending inwards beyond the middle, 

 the legs pitchy-brown ; the under surface pitchy-red, the apex of the abdomen black ; above and beneath 

 rather sparsely clothed with long hairs, which are fuscous on the elytra and fulvo-cinereous on the other 

 parts of the body. Head thickly and rather coarsely punctured, broadly triangularly depressed in front, 

 the frontal carina prominent, rounded anteriorly ; antennae less than half the length of the body, the 

 joints from the third moderately widened, becoming narrower outwards, 3 and 4 equal. Prothorax 

 broader than long, moderately convex, gradually narrowing from the base, the sides a little rounded 

 anteriorly ; the hind angles moderately produced, slightly divergent, incurved at the tip, carinate above ; 

 the surface sparsely, finely punctate, obsoletely canaliculate down the middle, the channel deepening 

 behind. Elytra elongate, gradually narrowing from the base ; rather coarsely striate-punctate, the stria? 

 (the first excepted) almost obsolete ; the interstices fiat (except on the basal declivity), sparsely punctured. 

 Beneath somewhat thickly punctured ; prosternal sutures deeply excavate in front ; mesosternum gradu- 



