328 SERRICOENIA. 



finely punctate, broadly triangularly depressed in front, the frontal carina prominent, rounded anteriorly ; 

 antennas nearly reaching the middle of the elytra, the joints from the third moderately widened, becoming 

 narrower outwards, 3 and 4 equal. Prothorax broader than long, moderately convex, narrowing from 

 the base, sinuate at the sides behind ; the hind angles greatly produced, strongly divergent, acute, feebly 

 carinate above ; the basal margin without the usual impression on either side ; the surface closely and 

 somewhat coarsely punctate, canaliculate from the base to near the apex. Elytra moderately long, 

 parallel to the middle, and narrowing thence to the apex ; finely punctate-striate, the striae (the first 

 excepted) almost obsolete ; the interstices flat, thickly punctured, the punctures finer than those of the 

 striae. Beneath thickly punctured; prosternal sutures deeply excavate in front ; mesosternuin declivous ; 

 posterior coxal plates angularly widened opposite the point of insertion of the femora. 

 Length 10|, breadth 2% miilim. ( d •) 



Hab. Mexico, Juquila in Oaxaca (Salle). 



One male example. Allied to /. viridis, but less convex, the head and thorax 

 pitchy-black ; the thorax canaliculate down the middle, sinuate at the sides behind, 

 and with more divergent hind angles, the fovese on the basal margin obsolete. 



27. IschiodontllS metalliciLS. (Tab. XIV. figg. 15, 6 ; 15 a, genitalia, d .) 



Elongate, moderately convex, shining ; pitchy-black, the elytra greenish-aeneous, with the suture and epipleurae 

 obscure ferruginous, the antennae pitchy-brown, the legs fusco-testaceons ; above and beneath rather 

 sparsely clothed with long blackish-brown hairs. Head sparsely, finely punctate, the front deeply 

 triangularly excavate, the frontal carina very prominent, rounded anteriorly ; antennae half the length of 

 the body, the joints from the third moderately dilated, 3 and 4 equal. Prothorax a little broader than 

 long, trapezoidal, rapidly narrowing from the base forwards ; the hind angles strongly produced, widely 

 divergent, slightly incurved at the tip, sharply carinate above ; the surface finely, sparsely punctate, 

 transversely depressed in the middle before the base. Elytra elongate, subparallel to about the middle, 

 and narrowing thence to the apex ; somewhat coarsely striate-punctate, the punctures becoming as fine 

 as those of the interstices towards the apex ; the interstices sparsely, finely punctate, and (except on the 

 basal declivity) flat. Beneath somewhat thickly punctured; prosternal sutures deeply excavate in front; 

 mesosternum declivous, the sides a little raised ; posterior coxal plates broadly and angularlv widened 

 opposite the point of insertion of the femora. 



Length 12, breadth 3 miilim. ( <3 .) 



Hab. Panama, Volcan de Chiriqui (Champion). 



One male example. This insect resembles I. chloropterus ; but may be easily known 

 from the corresponding sex of that variable species by its sparsely and finely punctured 

 head, the front of which is very deeply triangularly excavate, the more elongate 

 antennae, and the blackish pilosity. It approaches Anoplischius chalcopterus, which 

 also has the front very deeply excavate in the male, but differs from that insect in the 

 broadly and angularly widened coxal plates, and the stouter and much less elongate 

 antennse. 



28. Ischiodontus chloropterus. 



Dicrepidius chloropterus, Er. in Schomburgk's Reisen in Brit. Guiana,, iii. p. 558 \ 



Ischiodontus chloropterus, Cand. Monogr. Elat. ii. p. 101, t. 2. figg. 5, 5a 2 ; Steinh. Col. Hefte, 



xiv. p. 120 3 . 

 Ischiodontus smaragdinus, Cand. loc. cit. p. 102 4 . 



