22 RHYNCHOPHORA. 
4. Trachelizus lineatus, sp. n. (Tab. I. fig. 21, under surface of head, ¢ .) 
T. dispari simillimus; statura, presertim in thorace, paulo breviore: rufus, politus, elytris pone medium 
nigro-maculatis ; capite subtus utrinque linea pubescentie glandularis munito, intervallo longitudinali 
sat lato, polito. 
Long. 4-11 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
This insect is excessively similar to 7’. dispar, but, together with the following two 
species, is readily separated by the fact that the two fovee on the underside of the head 
are replaced by a line of white velvet-like matter, from which spring the few fine serial 
sete. The male of 7. lineatus is readily distinguished from all the others of the genus 
by the very broad, highly polished space on the last ventral plate; this space is 
impressed, and, in consequence, is limited in a remarkably definite manner from the 
punctate sides, which bear very little pubescence; the polished space becomes broader 
as it approaches the hind margin. | 
The rostrum in the male of this species is short and robust, its apical part being 
much shorter than the corresponding part of the female. Fourteen specimens. 
5. Trachelizus cognatus, sp. n. 
T. lineati simillimus: gracilis, rufus, politus, elytris pone medium nigro-maculatis; capite subtus utrinque 
linea pubescentie glandularis munito, intervallo longitudinali sat lato, polito. . 
Long. 4-10 millim. 
Hab. Panama, Volcan de Chiriqui ( Champion). 
This insect is distinguished from TJ. lineatus, in the male sex, by the longer rostrum 
and the less definite structure of the middle of the last ventral plate. The females of 
the two species I can only distinguish by placing the more slender as 7. cognatus, the 
others as 7’. lineatus. The greater elongation of the male rostrum causes this sex to 
look like the females of 7. lineatus and T. dispar, and thus greatly adds to the difficulty 
of separating these puzzling species by superficial examination. 
The structure of the last ventral plate differs from that of 7. dineatus in that the 
median polished space is less broad and less definitely separated from the lateral 
portions. Eighteen specimens. 
6. Trachelizus elevatus, sp.n. (Tab. I. fig. 22, under surface of head.) 
7. lineati simillimus: rufus, politus, elytris pone medium nigro-maculatis ; capite subtus utrinque linea 
pubescentix glandularis munito; linea hac posterius in duas evidentius divisa, intervallo longitudinali 
posterius magis elevato, convexo, margine posteriore libero pubescentia glandulari munito. 
Long. 4-114 millim. 
Hab. GuaTEMAua, Izabal (Sallé); Panama, Volcan de Chiriqui (Champion). 
This species differs from 7’. lineatus and T. cognatus in having the shining interval 
between the rows of glandular pubescence on the underside of the head broader and 
