16 RHYNCHOPHORA. 
Antenne with numerous but fine sete. Head and rostrum highly polished; the 
channel fine, definite, rather short. Thorax slender, narrowed in front, very shining, 
the transverse depression not deep. Elytra shining, outside the fifth interval not 
grooved, and with only fine punctures; the third interval much curved, the fourth 
forming in conjunction with the fifth an obtuse elevation, the two bearing at their 
summit the series of fine punctures that separates them. Front tibie with large 
excision. Head polished beneath, the serial sete obsolete. Metasternum sulcate. 
Abdominal depression large. 
Only one specimen was found of this very distinct species. 
16. Stereodermus filum, sp. n. (Tab. I. fig. 13.) 
Gracilior, rufescens, politus ; rostro elongato: capite angusto, elongato, oculis parvis ; femoribus basi gracilibus. 
Long. 44-6 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
The shape of the head and femora and the small eyes separate this species from 
all the other Stereodermi; it is, however,.to some extent connected with the more 
ordinary forms of the genus by S. nigriceps. The head and rostrum are highly polished, 
and both are elongate; the small eyes are quite remote from the vertex. The thorax 
is much narrowed in front, almost impunctate. The third interval of the elytra is 
narrow and shining; the outer parts are formed as in S. nigriceps, but the punctures 
are larger. The tibial excision is very large. The underside of the head is polished, 
but there is a large patch of velvet-like surface at the base, and on each side this is 
continued forwards to the pterygium by a series of fine sete. The slender base of the 
femora is very marked in the case of the hind legs. The metasternum is sulcate, the 
abdominal depression large. 
Five specimens. 
STEREOBATES, gen. nov. 
Antenne mediocres ; clava laxa, triarticulata. Tibiw anteriores intus excise. Femora omnia extus clavata, 
basi tenui; tibie compresses fere laminate ; tarsi modice elongati. 
The insects for which I propose this genus have in many respects the appearance of 
Stereodermus, but differ in the form of the legs, as well as in other minor characters ; 
in sculpture they differ from Stereodermus by the second and third interstices of the 
elytra being entire, and only slightly incurved towards the sutural interval. The thorax 
has a peculiar depression on the disc, bounded on each side by a short carina. The 
eyes are very prominent; the rostrum in front of the antenne is moderately long and 
slender; each joint of the club of the antenne is slender at the base. The under 
surface of the body is formed very much like that of Stereodermus ; but the legs are 
peculiar, the shape of the tibie (Tab. I. fig. 15)—laterally compressed, and witha more 
or less faint carina on each of the broad faces—being of itself sufficient to distinguish 
the genus from all the forms of Stereodermus I have seen. 
