18 
The generic name of Myoxomorpha was first applied in French 
collections to the Acanthoderes funerarius of Dejean^s Catalogue*. 
Neither the genus nor the species has yet been characterized; 
but Mr. White, in the Catalogue of the Longicorn Coleoptera of 
the British Museum, adopted the genus, adding to it the Acan- 
thoderes funestus of Erichson. A. funerarius, however, is a true 
Acanthoderes, having dilated and fringed fore tarsi in the males : 
it differs from most of the species only in the rounded tips of the 
elytra, a character presented by many of its congeners ; therefore 
the generic name can apply only to A. funestus. Myoxomorpha, 
as thus defined, is very closely allied to Acanthoderes, its chief 
distinction being the simple fore tarsi in the males. The un- 
grooved antennal joints, the voluminous eyes, narrow prosternum 
and horizontal mesosternum also separate it well from the ma- 
jority of the species. 
1. Myoxomorpha funesta,^T\Q\\^. 
Acanthoderes funestus y Erichson in Schomb. Reise, hi. 573. 
In facies and colours this species has some resemblance to A, 
funerarius. It is black, clothed beneath and on the legs with a 
fine silvery hoary tomentum. The forehead, vertex, a broad 
central vitta on the thorax, the scutellum, and the apical half of 
the elytra are also clothed with a very fine silky whitish pile, 
— the apical half of the elytra having a large patch on each side, 
and a number of small rounded spots of a black colour. 
Found throughout the Amazon region, sparingly, under the 
loose bark of felled trees, chiefly of Inga and other Leguminosse, 
in newly-made plantations. It is very sluggish in its motions. 
Genus Acanthoderes, Serv. 
Serville, Ann. Soc. Ent. Fr. iv. 29. 
Char, emend. Body oblong, more or less depressed, narrowed 
posteriorly. Head rather broad, muzzle transverse-quadrate, 
much depressed, its anterior angles distinct, front plane ; anten- 
niferous tubercles not prominent, consequently there is no con- 
cavity between the antennae ; mouth projecting ; mandibles long 
* A. funerarius, Dej. Cat. A. oblongus, crassus, niger, subtilissime punc- 
tulatus. Caput nigrum, vertice utrinque macula cana. Antennse crassae, 
nigrae, articulis tertio quartoque maxime elongatis supra sulcatis, reliquis 
abbreviatis. Thorax niger, tuberibus lateralibus conicis, dorso trituber- 
culato, marginibus cano-maculatis. Elytra simplicia, apice conjunctim 
rotundata, nbique sparsim grauulato-punctata, nigra, basi et pone me- 
dium confluenter cano-maculata vel cana nigro-maculata. Long. 5-1 1 
lin. A $ . 
llab. Mexico. 
