486 COLYDIIDA. 
Thorax strongly rounded at the sides, obscurely punctate, with the coste very sharply 
elevated and complex, viz. one parallel with the strongly elevated lateral margin, a 
short oblique one on the front on each side, and a median pair starting from the front 
margin, these diverging strongly and surrounding the discoidal sculpture, outside which 
they become a little rounded and then cease; the discoidal sculpture or shield is divided 
into two parts by a broad depression, each of the parts being carinate; the basal 
sculpture is separated from the discoidal by a deep depression, and consists of two short 
processes with converging and somewhat overhanging carinz, and between them, in 
front of the scutellum, a short cariniform tubercle. The elytra have each three sharply 
elevated coste, the intervals between which are without sculpture; the sutural interval 
is a little wider than the others. 
Very similar to P. dorsalis, but readily distinguished by the acute costiform elevations 
on the disc of the thorax. From P. exaratus, Melsh., to which it is equally similar, 
it may be separated by the carinate discoidal and basal tubercles of the thorax, and by 
the absence of all trace of costation on the intervals of the costa of the wing-cases. 
3. Prolyctus signatus, sp.n. (Tab. XV. fig. 16.) 
Rufescens, subnitidus, subdepressus ; prothorace lateribus ante medium subsinuatis, dorso signatura sub- 
quadrata, prope marginem lateralem costato ; elytris regulariter argute costatis, intervallis levigatis. 
Long. 37-43 millim. 
Hab. Guatema.a, Pantaleon (Champion); Nicaraeua, Chinandega (Sal/é). 
Head shining, distinctly punctate. Thorax rather short, a good deal narrower than 
the elytra, and a little narrowed behind; near the side with a well-marked costa; the 
elevated lateral margin in front suddenly approximated to this costa, so as to meet it at 
the front angle, and thus giving rise to the appearance of a sinuous or subangulate out- 
line; on the middle there is a large peculiar mark, subquadrate, and connected with 
the base by four channels—two, parallel, in front of the scutellum, and one at each 
corner behind, forming a slender tortuous channel going to the termination of the costa ; 
in front the discoidal mark has a small, less definite, prolongation forwards. Elytra 
with four regular coste, the two inner connected at the base; the shoulders with a 
minute denticle projecting outwards; the intervals flat, polished. Under surface 
polished, and with opalescent reflections. 
Three examples were obtained of this elegant and distinct species; the one from 
Nicaragua, though darker and larger than those from Guatemala, seems to belong really 
to the same species. 
4. Prolyctus annectens, sp.n. (Tab. XV. fig. 17.) 
Rufescens, vix opacus; prothorace lateribus subrotundatis, intra marginem costato, anterius utrinque carinula 
obliqua, dorso signatura magna ; elytris regulariter costatis, intervallis planis. 
Long. 34 millim. 
Hab. Panama, Volcan de Chiriqui 2500 feet (Champion). 
