198 RHYNCHOPHORA. 
2. Xyleborus czlebs, sp. n. 
Mas. Oblongo-ovalis, sat nitens, breviter erecte pilosus, piceus, pedibus antennisque fuscis ; prothorace trans- 
verso, apice obtusiusculo, inermi, supra anterius depresso, posterius irregulariter punctato, margine basali 
medio acute elevato ; elytris prothorace sesquilongioribus, oblique declivibus et preter suturam excavatis, 
excavatione opaca rugulosa, margine utroque laterali callose elevato, et spina magna per longum compressa 
paullo post medium instructo. 
Long. 3°7 millim. 
Male. Oblong-oval, dull piceous. Front flattened, impressed over the mouth and foveolate below the vertex, 
the upper margin of the impression subelevated, shining, and connected with the fovea by an indistinct 
ridge; surface moderately shining, irregularly and strongly punctate, closely along the mouth : mandibles 
prominent; eyes small, deeply emarginate; antenne fuscous. Prothorax a little broader than long, 
bisinuate at the base, its margin elevated in the middle into a transverse carina, gradually sloped in 
front, hind angles obtuse but not rounded, the sides widest about the middle, thence strongly rounded 
inta the apical margin, which is obtuse and not tuberculate in the middle, and subsinuate on either side ; 
dorsum depressed along the middle from the hinder third to the apex, anteriorly with rather feebly 
scattered asperities, absent over the median line, which posteriorly is rather closely punctured and 
laterally subimpressed ; rest of the surface moderately shining and irregularly punctured, with a glossy 
impunctate patch before the basal carina, pubescence scanty, erect. Scutellum small, triangular. Elytra 
narrower than the prothorax and one-half longer, their bases subsinuate, the shoulders subrectangular, 
the sides gently rounded up to the posterior third, but not narrowed, thence obliquely rounded to the 
apical margin, which is slightly incurved in the middle ; surface longitudinally convex, impressed along the 
suture and obliquely retuse behind, very indistinctly punctured in rows, the interstices with fine confused 
setiferous punctures, the outer ones obsoletely tuberculate at their apex ; declivity oblong, rather narrow, 
continued in front into the sutural impression, dull, rugulose and granulate, its side-margins callose, 
elevated behind the middle into a large compressed process terminating in a blunt spine directed inwards 
and backwards; anterior margin of the process continued forwards to form the ridge of the lateral callus, 
posterior margin directed at first forwards from the apex of the spine and then nearly vertically ; 
lower border of the excavation not acute, with a single tubercle at the extremities of the subconcave 
hind-margin. Underside and legs fuscous, the abdomen subimpunctate, the tibie formed as in 
X. godmani. 
Hab. Panama, Volcan de Chiriqui (Champion). 
The single example is the male of a species closely allied to X. godmani, but the 
differently constructed elytral armature does not allow it to be referred to that species. 
The differentiation of this group of forms requires close attention to be paid to this 
armature. Whilst in XY. godmani the large lateral spine is situated towards the front 
of the excavation, at the anterior end of the lateral callus, in XX. celebs its position is 
much farther back, on the callus itself and rather behind its middle. 
8. Xyleborus sanguinicollis, sp.n. (Tab. VII. fig. 11, apex of elytra.) 
? Bostrichus ruficollis, Fabr. Syst. El. 11. p. 388. 
Fem. Oblongo-ovalis, sat nitida, parce erecte pilosella, rufo-testacea, elytris nigris; prothorace fere ut in 
X. godmani constructo; elytris prothorace sublongioribus, oblique excavatis retusis, declivitate ante 
medium incipiente, in utroque latere spicula parva superne prope suturam, et spinula acuta medio 
armata. 
Long. 3°7 millim. 
Female. Oblong-oval, rather shining, bright red-testaceous with black elytra, pubescence scanty, erect, confined 
to the sides and extremities. Front convex, reticulate and dull, with scattered punctures, close over the 
mouth, and with an indistinct fovea near the vertex; mouth black, fringed; eyes as in X. godmani ; 
antenne testaceous-brown. Prothorax a little broader than long, as in X. godmani, but relatively 
