StapliijUiudce of the Amazon Vallvy. 225 



Labriim breve, medio siniiatum. jMandibiila^ robiista^, 

 medio tridentato?. Maxilla) mala interiore lata, barbata, 

 exteriore subelong'ata, apice dense longeqne barbata. Palpi 

 maxillares articulo primo secundo duplo breviore, lioc sat 

 eloiigato, basi angustiore; tertio secundo longiore, valde 

 incrassato, basi constricto. Labium* paraglossia valde 

 elongatis, acuminatis. Palpi labiales articulo ])rirao 

 sectuido fere duplo breviore, hoc elongato, cylindrico ; 

 tertio brevi, angustissimo, secundo fere quadruplo breviore 

 et angustiore. Antenna? crassiusculas, elongata?, vix 

 fracta3. Thorax angustus, elongatus, basi ajiiceque at- 

 tenuatus ; prosternum magnum, convexum. Elytra trun- 

 cata. Abdomen apicem versus leviter incrassatum ; penis 

 magnus, latus, oblongo-ovalis. Pedes sat elongati ; tibiis 

 anticis basi dilatatis, medio subito constricto ; tarsis om- 

 nibus simplicibus, articulo primo secundo duplo lon- 

 giore. 



Habitus singularis, capitis forma Ophitidem referens, a 

 qi;o oris partibus, antennis subfractis, tibiarumque anti- 

 carum structura singulari, discedit. 



1. SphcBronum opacum, n. sp. Elongatum, opacum, 

 capite, thorace, antennisque nigris, pedibus testaceis, elytris 

 abdomineque obscure rufescentibus ; dense subtilissimeque 

 punctulatum, subtilissimeque griseo-pubescens. Long, 

 corp. 51 lin. 



Mas : abdomine segmento 6" ventrali apice medio de- 

 presso, semicirculariterque excise ; segmento 7" late im- 

 presso, apice emarginato excisoque. 



Antennae nearly as long as head and thorax, black, not 

 in the least thickened towards the extremity; 1st joint 

 more than twice as long as 2nd, 4 — 10 differing but 

 little from one another ; last joint rather longer than the 

 10th. Head black, about as broad as the elytra, closely 

 and finely punctured and pubescent, produced behind into 

 a stout, tricarinate neck, the hind margin of which is 

 truncate. Thorax considerably narrower than the elytra, 

 twice as long as broad, much narrowed to the base and to 

 the front, its greatest Avidth at about two-thirds of the 



* The ligula is distorted in the preparation I have made of the trophi, 

 hut as far as I can see it appears to be entirely corneous ; if this be the case, 

 it will add another remarkable character to this very distinct genus. 



TRANS. ENT. SOC. 1876. — TART II. (jUNE.) Q 



