of the Amazon Valley. 253 
, 2. Criodion rhinoceros, 
Magnum_, parallelogrammicum^ vix depressuin^ fuscum, 
fulvo - griseo - tomentosum ; mandibulis supra medio 
utrinque cornu valido acuto armatis ; thorace transver- 
sim quadrato, supra inacquali, plagis elevatis nonnullis 
politis sulcisque rectis et curvatis; elytris subtilissime 
coriaceis, vermiculato-rugosis^ apice truncatis et utrinque 
bispinosis; pedibus robustis^ femoribus intermediis et 
posticis apice bidentatis. 
Long. 2 un. $ . 
Notwithstanding the very remarkable armature of the 
mandibles, this species is evidently a true Oriodion, all 
other parts of structure agreeing with the typical species 
of the genus. The horn-like processes arise from the 
upper edge of the organs about the middle, are nearly as 
long as the mandibles themselves, and incline towards 
each other, crossing at the apices ; together with the 
broad corrugate cheeks, they give to the head of the in- 
sect, viewed in profile, a curious resemblance to that of 
a Rhinoceros. The thorax is relatively much broader 
than in other species, and the irregular surface is marked 
in the middle with grooves forming a large trilobed figure, 
with the lobes directed towards the head. 
Hah . — River Tapajos. I beat an example out of a tree 
in the forests near the mouth of the Tapajos, in 1852.* 
Genus Sphallenum, nov. gen. 
This genus is formed for the reception of certain 
species allied to Griodion, which differ from that group 
in having the sockets of the intermediate haunches 
* The following is an undescribed species of Crioclion, differing in the 
nearly smooth thorax from the more typical forms : — 
Criodion hirsutum. 
Elongatum, angustatum, fuscum, fulvo-griseo-hirsutum, pilis thoracis 
et elytrorum decumbentibus. Caput rugosum, vertice inter oculos tuber- 
culo elongate. Thorax quadratum, lateribus paulo rotundatis et rugoso- 
tuberculatis, dorso sublaevi, punctis grossis et tuberculis lasvibus tribus 
notato. Elytra creberrine punctulata, apice rotundata, sutura solum 
spinosa, supra pilis sparsis decumbentibus vestita. Femora intermedia 
et postica apice unispinosa, tibiis apice extus valde spinosis. Acetabula 
intermedia extus paulo hiantia. 
Long. 1 un. 7 lin. ; lat. elytr. 4^ lin. 
Hah . — Bahia (a Dom. Reade captum). 
