208 RHYNCHOPHORA. 
Hab. Guatemaua, Cerro Zunil (Champion). 
One specimen. This is a very distinct species, differentiated from the majority of 
the genus by the asperate posterior half of the prothorax. In this and in other 
respects it approaches the Japanese X. lewisi, Blandf., but is separable by its more 
elongate form, black colour, and the prominent tubercles towards the apex of the 
second interstice. 
18. Xyleborus princeps, sp. n. (Tab. VII. fig. 20.) 
Fem. Sat elongata, nitida, ferruginea vel picea, parcissime pubescens ; prothorace subquadrato, transverse 
gibboso, posterius disperse punctato; elytris punctato-striatis, striis post medium obsoletis, interstitiis 
subconvexis, parce irregulariter punctatis ; declivitate oblique rotundata, subopaca, interstitiis 1°, 3°, 5° 
sat fortiter, ceteris subtiliter tuberculatis. 
Long. 6°3 millim. 
Female. Rather elongate, deep ferruginous, with the elytra darker behind, or entirely piceous, with very 
scanty erect hairs. Front moderately convex, strongly and deeply punctured, subimpressed over the 
mouth on either side, with a median carina extending midway to the vertex; mouth and sides. 
fringed with long hairs; eyes large, coarsely granular, approximate to the oral border ; antenne normal,. 
testaceous-brown. Prothorax quadrate, a little broader than long, bisinuate at the base, the hind angles 
obtuse but marked, the sides straight to the middle, thence rounded into the transverse apical border ; 
surface transversely gibbous in the middle, its anterior half rather strongly declivous, asperate, its. 
posterior half shining, with moderately deep sparse punctuation, and no distinct median line. Scutellum 
small, triangular. Elytra as wide at base as the prothorax and more than one-half longer, their basal 
borders separately rounded, humeral angles obtuse, sides straight to the middle and very slightly 
divergent, thence gradually rounded, the apical border obliquely rounded and sharply margined ; surface 
convex from base to apex, obliquely declivous from the middle, with rows of strong punctures, which are 
deeply striate from behind the base to the posterior third, interstices shining, subconvex, transversely 
rugose, with fine scattered irregular punctures tending to form single rows; declivity duller, with the 
strie nearly obsolete, their punctures weaker, the Ist, 3rd, and 5th interstices with three to six well- 
marked remote tubercles, the remainder more finely and closely tuberculate. Underside and legs 
brownish-testaceous; tibiae with close comb-like teeth, upper border of the anterior pair angulated. 
Hab. Nicaragua, Chontales (Janson); Panama, Volcan de Chiriqui (Champion). 
Three specimens were taken by Mr. Champion, and one by Mr. Janson. With the 
exception of Xyleborus colossus, Blandf., from New Guinea, this is the largest described 
Xyleborus. It is very like X. grandis, Kichh., but is larger and relatively wider, and 
the very distinct difference in size of the apical tubercles on the alternate interstices. 
of its elytra is wanting in that species. 
19. Xyleborus commixtus, sp. n. 
Fem. Subcylindrica, sat nitida, ferruginea vel picea, parce fusco-pilosa ; fronte fortiter punctata; prothorace 
fere quadrato, dorso umbonato, posterius vage subtiliter punctato; elytris striato-punctatis, interstitiis 
singulis serie punctorum vix perspicuenda et posterius tuberculis parvis setiferis notatis, apice sat convexe 
declivi, infra acute carinato. 
Long. 4 millim. 
Female. Subcylindric, deep ferruginous or piceous, shining. Front scarcely convex, impressed on either side 
over the mouth, covered with large deep punctures, mostly longitudinal, and with a narrow irregular 
subcarinate line from the epistoma to the vertex, pubescence confined to the sides, the mouth thinly 
