Mr. H. W. Bates on the Longicorns of the Amazon Valley. 11 
EXPLANATION OF PLATE I. 
Figs. 1 to7. Terebratula sinuosa, Brocchi; different ages and variations 
in form. 7. Interior of the dorsal valve of a small specimen. 
Fig. 8. Terebratula minor, Philippi. 
Fig. 9. Terebratulina caput-serpentis, Linn. 9 a. Enlarged illustration. 
Fig. 10. Megerlia truncata, Linn. 10 a. Enlarged. 
Figs. 11, 12. Argiope decollata, Chemnitz. 11a. Enlarged figure. 
12. Enlarged interior view of the dorsal valve. 
Fig. 13. Thecidium Adamsi, Macdonald. 13 a, 6. Enlarged figures. 
Fig. 14. Rhynchonella bipartita, Brocchi. 
Il.—Contributions to an Insect Fauna of the Amazon Valley. 
CoreorrerA: Loneicornes. By H. W. Bares, Esq. 
[Continued from vol. xiii. p. 164.] 
Genus Hy Lrrrus, nov. gen. 
Body elongate-oblong, more or less depressed, free from setz. 
Head, as in all the allied genera, much narrower than the thorax, 
with the antenne approximated at the base; muzzle short and 
obtuse; lower lobe of the eyes subquadrate. Antenne greatly 
elongated, sparingly furnished beneath with short bristles. 
Thorax uneven on the surface ; lateral tubercles prominent and 
placed near the middle of the sides. Elytra without smooth 
lateral keels proceeding from the shoulders. Sterna simple. 
Terminal abdominal segment in the males with both dorsal and 
ventral plates notched or emarginated. Ovipositor of the female 
elongated, tubular; dorsal plate pointed, ventral truncated. 
Legs moderate ; thighs clavate, thickly so in the males; basal 
joint of the posterior tarsi as long as, or longer than, the two 
following taken together. Fore and middle tarsi in the male 
dilated and fringed with hairs. 
The chief character which distinguishes this group from Nys- 
sodrys is the dilatation and ciliation of the anterior and (in less 
degree) of the intermediate tarsi in the males. Some of the larger 
species of Nyssodrys have the male anterior tarsi much broader 
than those of the hind legs, but in none of them are they fur- 
nished with the marginal fringe of hairs. The Hy/etti: are some- 
what larger insects than the Nyssodryes, and the shape of their 
thorax is somewhat different, the lateral spines being in the 
form of large or distinct tubercles, and placed near the middle 
of the sides. The genus approaches Acanthocinus and Graphi- 
surus (groups characteristic of North America and Europe) 
nearer than any we have yet passed in review. 
Hylettus cenobita, Evichs. 
Leiopus cenobita, Erichson, Consp. Ins. Col. Peruana, p. 145. 
‘I, fuscus, dense cinereo-tomentosus, supra flavo irroratus, scutello 
