of the Amazons Valley. 197 
tata, concava, apice utrinque rotundato, margine superiore sub- 
recto, margine inferiore utrinque angulato-dilatato. Long. 4-43 
lin. Qi: 
Generally distributed throughout the forests of the Amazons. 
Group Compsosomine. 
Genus CompsosoMa, Serville. 
Serville, Ann. Soe. Ent. 1835, p. 55. 
This well-known and handsome genus of Lamiaires, by its 
compact, thick, oval forms, reminds one of the Anisocerine and 
Hypsiome. The group has been placed in the neighbourhood 
of the Hypselominz by Mr. Pascoe, and M. Thomson sees a re- 
semblance between the genus Arenea (belonging to the Comp- 
sosomine) and Gymnocerus. Compsosoma and its associated 
genera, however, differ from the Anisocerine by the tarsal claws, 
which are scarcely divergent, and from the Hypselominee by the 
shortness of the claw-jomt. The hairy clothing of body and an- 
tenn, and the form of the head, eradually rounded off or slo- 
ping from the occiput to the epistome, are also characters which 
distinguish the Compsosomine from the Anisocerine and the 
Onciderite, to which Hypsioma and Hypselomus belong. Although 
the lower part of the head, or muzzle, of some species resem- 
bles, in its square form, that of the Anisocerine group, yet this is 
evidently an inconstant character in the Compsosomine; for other 
species (e. g. Compsosoma Mniszechii) have almost precisely the 
same form of muzzle as the Desmiphorite, to which group I con- 
sider, notwithstanding the difference in the general form of the 
body, the Compsosominze belong. This form of head is utterly 
foreign to the Anisocerine and the Oncideritze. 
1. Compsosoma Mniszechii, Thomson. 
Compsosoma Mniszechii, Thoms. Archiv. Entom. i. p. 74, pl. 9. f. 4. 
C. oblongo-ovatum, crassum, convexum, hirsutum, grosse punctatum, 
elytris nigro-tuberculatis; thorace fuliginoso, vitta lata cinereo-fulva; 
elytris humeris rotundatis, plaga humerali fuliginosa (fulvo tincta), 
deinde utrinque vitta lata obliqua cinereo-fulva, parte postica fuli- 
ginosa, medio fulvo-sericea, suturaque cinerea; pectore utrinque 
plaga cretacea ; antennis filiformibus, hirsutis. Long. 7 lin. 
I founda few examples only of this fine species, on the slender 
stem of a young tree, in the forest at Kga, Upper Amazons. The 
lower part of the face is extremely short, scarcely extending 
below the eyes; the latter are large and convex. 
2. Compsosoma terrenum, Pascoe. 
ZBrenea terrena, Pascoe, Trans. Ent. Soc. n. s. vol. i. p. 25. 
C. parvum, ovatum, obscure fulvum, undique breviter setosum ; capite 
