Mr. H. W. Bates on the Longicorns of the Amazons. 425 
Fig. 15. A diagrammatic enlargement of the edge of the disk, principally 
to show how the cilia (0) arise from the furrow (6°), and also the 
relation of the peristome (d') to the furrow. The outer (p) and 
inner (p') walls are represented in their relative proportions. 
Fig. 16. A portion of the adherent apparatus, from a dead animal, to show 
the wrinkling of the striated membrane (/') and the overlapped, 
apparently forked, coarser striz (J). The latter are seen through 
the thickness of the membrane, the finer striz being omitted. 
The hooks (A) and radii (2) lie on the side next the eye. 950 
diam. 
Fig. 17. A basal view of the adherent apparatus, velum, and a part of the 
posterior row of cilia. The hooks (4) with their crests (/) lie 
nearest the observer, and partially covering the striated mem- 
brane (/' to 7’). The radii (7, 7') with their webs (7°) fill up the 
central area. The posterior face of the striated membrane with 
its finer strize is shown from /‘ to 7’, and the anterior face of the 
same, as seen through its thickness, with its coarser striz (/*), 
between /' and /*. The distal edge (/') is crenated and thickened. 
The proximal edge (/*) runs along the bases of the hooks. The 
velum (f', £1) is attached by its proximal edge (f”) close to the 
distal margin (/', /*, /*) of the striated membrane, and almost the 
same with, but just anterior to, the line of attachment of the 
cilia (g, g) of the basal crown. Between ?? and f? the striz of 
the membrane are omitted. 950 diam. 
Fig. 18. Two of the hooks and their corresponding radii, from the adherent 
apparatus of a dead specimen. The hook (h), its horizontal 
limb (4’), the spur (h?), and the crest (k) apparently form one 
solid piece. The radius (7) and the nail-shaped transverse piece 
(z', ) are united at the angle by a triangular web (7). The 
mechanical contrivance for the sliding of these pieces upon and 
between each other is too obvious to need any comment. 2400 
diam. 
Cambridge, Mass., October 1865. 
XLV.— Contributions to an Insect Fauna of the Amazons Valley. 
CoLeorTeRA: Loneicornes. By H. W. Barus, Esq. 
[Continued from p. 373. ] 
Genus AmMpHionycHa (Dej. Cat.), Thomson. 
Thomson, Archiv. Entom. i. p. 311. 
The numerous species which compose this genus agree in the 
possession of long filiform antennz, with the joints more or less 
densely frmged with fine hairs, but never partially thickened, 
clothed, or tufted; the third joint is more or less dispropor- 
tionately elongated. The body is variable in shape, but is ge- 
nerally elongated and linear, in some species greatly elongated, 
in others much shorter and oblong. All have well-developed 
lateral carinz on the elytra; the apices of the latter are variable, 
being in some species broadly truncated and toothed, in others 
briefly truncated, and in some species rounded and entire. 
