XYLEBORUS. 209 
ciliate; eyes small, deeply emarginate; antenne testaceous-brown. Prothorax as long as broad, 
subquadrate, truncate at base, the hind angles obtusely rounded, the sides very slightly curved, widest 
behind the middle and narrowed towards the rounded anterior angles, apical border subtruncate ; surface 
obtusely elevated in the middle, with erect pubescence round the sides and apex, asperate in front, its 
posterior half with fine scattered punctures, an indistinct median line and a shallow oblique fold 
extending inwards from each posterior angle, which is slightly thickened. Scutellum rounded triangular. 
Elytra one-half longer than the prothorax, their basal border a little wider and truncate; shoulders 
rounded, with no prominent callosity, sides feebly rounded and not narrowed towards the subcircular, 
carinate, apical margin; surface convex from base to apex, obliquely declivous behind, with scarcely 
impressed rows of shallow punctures, the sutural stria not deeper, the inner rows very slightly sinuate 
near the base, interstices flat, transversely subrugose, with irregular single rows of minute punctures, and 
behind the middle with small setigerous tubercles; declivity not very oblique, slightly flattened and 
impressed round the margin, the sutural strie subimpressed, the punctures of the striz dilated, the 
interstices subconvex. Underside ferrugineous or piceous, nearly glabrous, the last abdominal segment 
rather closely punctured ; legs fusco-testaceous, the anterior tibiee not very finely serrate. 
Hab. Panama, Bugaba (Champion). 
Two examples. This species resembles X. princeps in shape, but is much smaller, 
and the tubercles on the alternate interstices do not vary in size as in that species. It 
is also smaller than XY. grandis, Kichh., with the prothorax less transverse, more 
distinctly narrowed in front, and much more finely punctured; the elytral declivity is 
much less oblique, and its strie are finer and not distinctly impressed. 
20. Xyleborus quadratus, sp. n. 
Fem. Subelongata, cylindrica, ferruginea, parce pilosa; capite subtiliter punctato; prothorace quadrato, apice 
truncato, post medium nitido parce subtiliter punctulato; elytris versus apicem gradatim angustatis, 
striato-punctatis, interstitiis parce uniseriatim punctatis et in declivitate obliqua subtiliter tuberculatis. 
Long. 3°6 millim. 
Female. Rather elongate, cylindric, ferruginous, or somewhat testaceous. Front convex, very closely 
reticulate, with a median shining area bearing a few deep but fine punctures at the sides; pubescence 
rather long, scanty except round the mouth. Prothorax quadrate with rounded angles, the sides very 
obtusely rounded, the apex transverse in the middle; disc thinly pubescent, transversely and rather 
strongly elevated in the middle, its anterior half asperate, the posterior half very finely and sparsely 
punctate. Elytra a little more than half as long again as the prothorax, the sides nearly parallel to the 
middle, thence gradually and obliquely incurved to the apex; surface longitudinally convex, obliquely 
declivous from the middle, with weakly impressed rows of close strong punctures, the sutural stria not 
deeper ; interstices flat, with single series of very fine punctures bearing scattered short erect bristles ; 
declivity convex, not strongly margined below, with the rows of punctures impressed, but becoming 
confused and subrugose towards the tip, and with the interstices furnished with rows of small piliferous 
tubercles. Underside and legs testaceous or reddish; the tibie finely serrate. 
Hab. Panama, Bugaba (Champion). 
Two examples. This species is nearly allied to X. adelographus, Kichh., but, apart 
from the difference of colour (and it is impossible to tell whether these light-coloured 
Xylebori, if examined in a short series, may not really be immature), the elytra are 
relatively shorter and not parallel-sided for so great a portion of their length; seen 
from the side they present a distinct longitudinal curvature throughout; the teeth of 
the anterior tibie and the tubercles of the interstices are much finer. It is smaller 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 6, January 1898. 2 EE 
