of the Amazon Valley. 421 



Oculi supra longe distantes. Tubera antennifera vix 

 elevata, distantia, lata, supra sulcata. AntemiJB ar- 

 ticulo Imo crasso, curvato, 3-10 elongatis, dilatatis, 

 apice angulis productis, 3io casteris singulis duplo longiori, 

 3-7 supra et infra late sulcatis et infra longe ciliatis, (J 

 magis, 9 minus elongatis. Thorax prope basin latera- 

 liter profunde oonstrictus, deinde usque ad apicem an- 

 gustatus, ibique anguste lateraliter constrictus, supra 

 laevissimus. Elytra elongata, apice obtuse truncata. 

 Pedes breves, validi ; femora paulo incrassata ; tarsi 

 breves, articulo primo triangulari. Mesosternum in 

 medio tumidum. 



The difference in the form and clothing of the an- 

 tennal joints of itself would scarcely warrant the separa- 

 tion of this genus from Platyarthron; but the form of 

 the anterior part of the head, the short and extremely thick- 

 ened muzzle, the very strong and sharply curved man- 

 dibles, and the wide flattened shape of the antenniferous 

 tubercles, form a combination of characters which forbid 

 the association of the form with the genus in question. 



1. Phimosia ehenina, n. sp. 



Elongata, antice angustior, nigra, nitida, glabra; an- 

 tennis, pedibus, et corpore subtus interdum piceis ; capite 

 thoraceque vix punctulatis; elytris subtiliter coriaceis et 

 punctulatis, utrinque linea angusta recta a basi usque 

 ultra medium, lineolisque duabus exterioribus, albis. 



Long. 6^-7^ lin. S ? . 



Hah. — Para. One pair taken in copula. 



Genus Streptolabis. 



Bates, Entom. Monthly Mag. iv. 23 (1867) ; Lacord. 

 Gen. ix. 153. 



Oblonga, elytris oblongo-quadratis, postice dilatatis, 

 glabra. Caput parvum, angustum, mandibulis horizon- 

 taliter porrectis et recurvis. Oculi hand prominentes, 

 reniformes, supra longe distantes. Antennae robustae, 

 glabrae, articulo 3io cteteris paulo longiori, 3-10 subser- 

 ratis, supi-a et infra sulcatis. Thorax transversus, antice 

 rotundato-attenuatus, antice et postice sulco profundo 



TRANS. ENT. SOC. 1870. PART IV. (DECEMBER.) G Q 



