Amazonian Triomdea, 57 



thorax in the S has its lateral margins free from crenu- 

 lations, and is of a tawny-orange colour above and 

 beneath, except a narrow mark on the hind margin on 

 each side ; above, it has a few strong punctures on the 

 sides, and in the deep central fovea. In the ? the 

 thorax is crenulate on the sides, and has numerous 

 large punctures on the sides and in the central fovea, 

 most of the elevated portions being impunctate. The 

 posterior part of the elytra, in both sexes, is rendered 

 rough and opaque by the extreme closeness and minute- 

 ness of its punctuation. In the $ , the middle coxge, 

 the greater part of the anterior and middle femora, and 

 the broad metasternal process, are fulvous-red. 



I met with one pair only of this species, on the trunk 

 of a slender tree, in a small clearing in the forest, near 

 St. Paulo, on the Amazons. They were actively moving 

 about in the heat of the mid-day sun. 



The following genus seems to be a degraded form of 

 the Pyrodes type, wanting the grooved mesosternum, the 

 sulcate head, and many other minor characters of the 

 group. Its projecting metasternum indicates a nearer 

 affinity with Esmeralda than with the Poecilosomince, in 

 which group it is placed by Lacordaire. No other 

 member of the Pcecilosomina^ or Solenopterince is found 

 on the Amazons.* 



* The following very interesting species has recently been discovered 

 by Mr. Belt at Chontales, Nicaragua ; it connects the two North-American 

 genera Holonotus and Sphenostethus. 



Eolonotus nigroceneus, n. sp. 



Elongatus, convexus, scaphiformis, Sphenostetlio serripenni similis, sed 

 Bcutello hand elongate, aterrimus nitidus, supra praecipue elytris aeneo- 

 tinctus. Caput parvum, supra late sulcatum, grosse sparsim puncta- 

 tum. Anteimae ( $ ) dimidio corporis breviores, articuhs valde com- 

 pressis latis, vix pimctatis. Thorax a basi usque ad apicem attenuatus 

 et declivis, marginibus lateralibus integris, disco sparsim subtiliter, 

 lateribus grosse et rugose punctatus, margine postico elytris angus- 

 tiore, utrinque sinuato, lobo mediauo truncato. ScuteUum latum, 

 triangulare, apice depressum, l^ve. Elytra a basi usque ad apices 

 regulariter attenuata, humeris obhquis rotundatis, apicibus rotundato- 

 truncatis serratis ; supra coriacea, subnitida, passim modice punctata. 

 Subtus glaber, pectoris lateribus punctatis, vix pilosis ; mesosternum 

 crassum, apicem prosterni incimibens. Pedes nigerrimi, nitidi, tarsia 

 brevibus, latis. 



Long. 1 unc. 2 lin., lat. 5 lin. $ . 



Hah. — Chontales, Nicaragua ; in Mus. nostr. 



