TRACHELIZUS. 23 
more elevated behind, and the interval itself set with the peculiar white substance I 
have called glandular pubescence. The two basal ventral segments are more prominent 
than they are in the allied species. ‘The structure of the terminal ventral plate of the 
male is much like that of Z. dispar, but the area of dense punctuation at the hind 
margin is broader. The mucro at the apex of the hind tibia is long and conspicuous. 
Thirteen specimens. The variation in size is even greater than it is in the allied 
species. 
The characters I have given to distinguish the preceding four species are drawn 
chiefly from the under surface of the body. These species, however, may be 
distinguished from above by attention to the superior orbital fovea: this is large in 
T. dispar, and is entirely absent in 7. elevatus; in TL’. lineatus and T. cognatus the fovea 
is present though small. The males of 7. lineatus and T. cognatus may be readily 
distinguished by the difference in their rostrums, but the females appear to me scarcely 
distinguishable. Each of the four species varies enormously in the size of the 
individual, hence no attention must be paid to this in determining them. 
§2. Thorax deeply sulcate along the middle, either on the basal part or for nearly 
all the length. (Species 7-23.) 
A. Prosternum of male without fovea in the middle. (Species 7-20.) 
7. Trachelizus hirtellus, sp. n. 
Rufo-castaneus, nitidus, haud deplanatus, setis tenuibus erectis parce armatus ; prothorace dorso distanter 
subtiliusque punctulato, basi canalicula arguta, angusta, per dimidiam longitudinis ducta ; elytris seriatim 
remote punctatis. 
Long. 44-12 millim. 
Hab. Nicaraeva (Sallé), Chontales (Belt, Janson); Panama, Volcan de Chiriqui 
(Champion). 
This species has the general form of 7. dispar and its allies. The eyes are very 
prominent, the angular depression between them very distinct. The thorax is rounded 
at the sides and greatly narrowed in front; it is very shining, but bears at the sides 
some rather large setigerous punctures. ‘The elytra bear distant series of rather large 
but indefinite punctures, from each of which there rises a fine erect hair; the interstices 
at the apical declivity are distinctly convex. ‘There is a great difference in the form of 
the rostrum in the two sexes, that of the male being very broad in front. Beneath 
there are two series of punctures extending as far as the pterygia; the basal punctures 
of these series are not deep. ‘The male has an impression on the basal ventral segment ; 
both sexes have the metasternum impressed, but the impression in the male is more 
or less vague and broad. 
Fifteen specimens. The variation in size is very great, but I cannot find any specific 
