ISCHIODONTTJS. 331 



violaceous lustre, which sometimes extends to the whole of the disc ; the antennae black or blackish- 

 brown, the legs pitchy-brown, the knees and the tips of the tarsi ferruginous ; above and beneath rather 

 sparsely clothed with long yellowish-cinereous hairs. Head closely, rather coarsely punctate, deeply 

 triangularly excavate in front in the male, shallowly so in the female, the frontal carina very prominent, 

 rounded anteriorly ; antennae — ( J ) fully three-fourths the length of the body, the joints from the third 

 broadly widened and rather sharply serrate, becoming narrower outwards, 3 and 4 equal — ( £ ) scarcely 

 half the length of the body, the joints from the third moderately widened. Prothorax broader than long, 

 convex, narrowing from the base in the male, the sides a little rounded anteriorly in the female ; the 

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

 the male sparsely and finely, in the female more coarsely and closely, punctate, obsoletely canaliculate 

 down the middle, the channel deepening behind. Elytra very elongate, narrowing from the base, 

 moderately finely punctate-striate, the striae (the first excepted) almost obsolete, the interstices flat (except 

 on the basal declivity) and sparsely punctured. Beneath somewhat thickly punctured ; prosternal sutures 

 not grooved in front ; mesosternum declivous. Legs elongate ; posterior coxal plates triangularly widened 

 opposite the point of insertion of the femora. 

 Length 10^-16, breadth 2|-4i millim. ( S $ •) 



Hab. Guatemala, Cerro Zunil, Volcan de Atitlan [Champion). 



Six males and one female, all from the Pacific slope. The female, as usual, is much 

 larger than the male ; it also has the head and thorax more closely and more coarsely 

 punctured. In the exceedingly elongate antennae in the male and ungrooved prosternal 

 sutures this species approaches I. denticornis ; but it is much larger and more elongate, 

 the elytra are differently coloured, the frontal carina is more prominent, and the 

 antennae in the male have their joints 3-8 less strongly produced at their inner apical 

 angle. 



33. Ischiodontus viridis. (Tab. XIV. fig. 19, <s .) 



Moderately elongate, rather convex, shining ; the head, prothorax, scutellum, and underside aeneous, the elytra 

 metallic-green, the antennae black, the legs pitchy-brown ; above and beneath thickly clothed with long 

 yellowish-cinereous hairs. Head densely, moderately finely punctate, triangularly depressed in front, the 

 frontal carina prominent, rounded anteriorly ; antennae extending nearly to the middle of the elytra, the 

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

 convex, broader than long, narrowing from the base ; the hind angles strongly produced, divergent, finely 

 and obsoletely carinate above; the surface thickly, moderately finely punctate, canaliculate behind. 

 Elytra moderately long, subparallel to the middle and narrowing thence to the apex ; finely punctate- 

 striate, the punctures closely placed, the sutural stria deep ; the interstices flat, somewhat thickly 

 punctured, the punctures finer than those of the striae. Beneath rather closely punctured ; prosternal 

 sutures deeply excavate in front ; mesosternum declivous ; posterior coxal plates angularly widened 

 opposite the point of insertion of the femora. 



Length 2f , breadth 2| millim. ( <$ .) 



Hab. Mexico, Cerro de Plumas (Hbge). 



One male specimen. This species may be known from all the allied forms by the 

 brassy head and thorax and brilliant metallic-green elytra. It is less elongate and 

 more thickly pilose than I. chloropterus and I. metallicus ; the head and thorax are 

 much more closely punctured, and the hind angles of the thorax are obsoletely carinate 

 at the tip only. The antennae are much more elongate than in the corresponding sex 

 of /. chloropterus. 



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