of the Amazon Valley. 
Genus Malacoptekus. 
247 
Serville, Ann. Soc. Ent. Fr. 1833_, p. 565; Lacord. Gen. 
viii. 227. 
1. Malacopterus lineatus, Guerin, Icon. Regne Anim. 
p. 222. 
Elongatus, depressus, pallidus ; elytris utrinque brunneo 
bivittatis, thorace medio carinato, margine postico pro- 
ducto-lobato ; an tennis fortissimis ( S ) apicem versus 
attenuatis. 
Long. 10 lin. 
Hah. — Para. 
Sub-fam. Acheysonin^. 
This sub-family differs from the CEniince only in the 
anterior haunches being less angulate externally, with 
the sockets having a corresponding narrower and shorter 
opening on their outer side. 
Genus Acheyson. 
Serville, Ann. Soc. Ent. Fr. 1833, p. 572; Lacord. Gen. 
viii. 232. 
1. Achryson surinamum. 
Ceramhyx surinamus, Lin. Syst. Nat. ii. 632. 
A widely-distributed and well-known insect, cylindrical 
in form, of pale reddish-testaceous colour, with a black 
circumflex mark on the posterior disc of each elytron, 
and a few smaller spots on the anterior part of the same. 
Common throughout the Amazons ; the earlier states 
are passed in the interior of certain trees having wood of 
a light texture, and the insect is often found in the 
neighbourhood of houses. 
2. Achryson nanum, n. sp. 
Parvum, lineare, rufo-testaceum, unicolor, corpore toto 
longe piloso; thorace quam in A. surinamo longiori et 
magis cylindrico, creberrime subtiliter rugoso, tuberculis 
T 2 
