of the Amazon Valley. 
255 
tomentosis ; tliorace nudo^ grosse et confuse rugoso- 
punctato ; elytris castaneis, subtiliter punctulatis^ apice 
utrinque bispinosis ; femoribus medio Isete rufis. 
Long. 1 un. 2 lin. — 1 un. 6 lin. $ $ . 
Agrees with Erichson^s description of Griodion cos- 
tanopterum in all points, except the broad clear red ring 
round the middle of all the femora. It is possible, 
therefore, that ErichsoAs species may form a third and 
distinct one of this group. 
Hah . — Upper and Lower Amazons ; in the same situa- 
tions as S. puncticolle. 
3. Sphallenum tuberosum j n. sp. 
Minus elongatum et vix convexum, nigro-fuscum, gla- 
brum, nitidum, an tennis scutello lateribusque pectoris 
leviter tomentosis ; capite thoraceque impunctatis, hoc 
tuberibus magnis circa 1 3 notato, toto Isevi, polito ; 
elytris vix punctulatis, apice utrinque bispinosis; pedibus 
piceo-rufis, femoribus medio et apice tibiisque basi fuscis 
exceptis. 
Long. 1 un. 2 lin. 
Ha h . — Tapaj os . * 
Genus Xestia. 
Serville, Ann. Soc. Ent. Fr. 1834, p. 16 ; Lacord. 
Gen. viii. 271. 
Restricted to those species which have the intermediate 
sockets quite closed, and the middle and posterior femora 
and tibiae without spines at the apex. 
* Criodion erythropus (Lucas, in Voy. de Casteln. p. 187, pi. xi. f. 6), 
from South Brazil, will, according to the views of Lacordaire (Gen. viii. 
271, note), which I have here adopted, require to be separated from 
Criodion, on similar grounds to those on which Bphallenum is instituted. 
The genus may be termed Butherium, with the following characters : — 
Butherium, nov. gen. 
Corpus ohlongum, nudum. Caput tuberculis antenniferis basi late 
separatis ; antennis articulo 4to (utroque sexu) baud 5to breviori. Fe- 
mora apice simplicia, tibiis intermediis et posticis apice extus spinosis. 
Acetabula intermedia anguste hiantia. 
Type. B. erythropus, Lucas, loc. cit. 
