1876.] 277 



opportunity of studying in the rirli collection of Dr. Baden, somewhat 

 resembles H. gemmatus (Bates), Nicaragua, but is a perfectly distinct 

 species, with an obtuse lateral tubercle to the prothorax. 



OyrcnocERUs ampliatus, n. sp. 



Magnvs, ovatiis ; infra nig er, opacus, supra cine reus ; thorace parvo, ufrinque 

 ante et supra coxam spina magna, disco tuhereuUs duohus valde elevatis ; elytris 

 amplissimis, supra uirinque crista valida hasali, tubercuUs duobus disci, alteris 

 majoribus geminatis posteriorihus, alteraque prope apicem, cinerels, plagis utrinque 

 marginal ibus nigris ; pedibus nigris, opacis. Long. 10 — 11 lin. $ . 



Relatively much broader than O. scorpio, with much smaller 

 thorax. The auteuuc'e ( $ ) are only two-thirds the length of the body, 

 with long 2nd joint (half as long as the 3rd), and 5th to 10th abbre- 

 viated and dilated ; 11th clawrshaped. All the tibise are much com- 

 pressed and dilated towards the apex, and have a conical prominence 

 on the outer edge near the knee joint, the rest of their edges being 

 simple. The spine on the flank of the prothorax (below the lateral 

 tubercle) is longer than in O. scorpio, and the two dorsal tubercles 

 more elevated. The elytra are broader and shorter ; the shoulders 

 produced and sub-falcate, the sides sinuated behind them, and much 

 rounded outwards behind the middle ; the ridge-shaped tubercles on 

 the posterior part of the disc are double and much elevated ; the 

 humeral prominences and basal crests are tubcrculatcd, and there 

 is a line of tubercles along the suture. 



E. Ucayali and Macas ; Peru and Equador. The ashy colour of 

 the iipper surface varies, probably according to locality, from uniform 

 ashy-white to ashy more or less clouded with dusky. 



Eu.STHENOMUS, IIOV. ffCfl. 

 Gen. Tlatysterno ajfflne atque quoad formam simile; dijfert antennis xdroque 

 sexu. elongatissimis, etc. Corpus oblongum. Caput fronte infra dilatata ; oculis 

 distantibus, subliliter grannlatis. Antenna ((J) corpore triplo longiores simplices ; 

 scapo pyriformi, articulis 8 — 11 valde elongatis, subcequalibus. Thorax dorso value 

 bicarinalus, spina lalerali magna, acuta, simplici. Elglra apice late rolundata ; 

 humeris valde exiantibus, aculis ; dorso utrinque valde unicarinata, carinis post 

 scutellum carina transversali conjunctis. Mesoslernum transversum, antice biluber- 

 culatum ; acelabula extus late hiantia. Tarsi antici {^) vix dilatati,arliculo prima 

 lateribus ciliatis. 



This genus will not fit any of Lacordaire's "groups." In its 

 character it is almost exactly intermediate between the genera Platij- 

 sfermis and Stcirastoma, having the antennfo of the latter, and the 

 thorax, clytral carina*, and open middle acetabula of the former. With 

 regard to the lateral spines of the thorax, although they have not a 

 tubercle on their anterior sides as in Plafi/.'ifernus, there is a similar 



