186 HETEROMERA. 
pubescence on the prothorax and on the base and apex of the elytra (the scutellar region excepted) whiter, 
that of the under surface silvery-white, the prothorax opaque, the head and elytra (when denuded of 
pubescence) shining. Head large, closely and finely punctured; eyes (¢) finely pubescent, very large, 
occupying the whole of the side of the head (the head not extended behind them), narrowly separated, 
rather coarsely granulated, moderately emarginate; palpi fusco-testaceous; antenne ( ¢) long and stout, 
very pubescent, black, the two basal joints fusco-testaceous, joints 1-3 rather slender, 2 very short, not 
half the length of 3, 3 and 4 about equal in length, 4-10 much wider than 3, flattened and subtriangular, 
longer than broad, 11 stouter and about one third longer than 10, obliquely truncate at the apex; pro- 
thorax convex, much narrower than the head, nearly as long as broad, rounded and narrowed at the sides 
in front and a little narrowed behind, the disc with an oblique depression on each side a little before the 
middle and a shorter and shallower one on either side near the base (the basal depressions nearer 
together than the others), the surface closely and finely punctured ; elytra convex, at the base about one 
half broader than the prothorax, a little rounded at the sides, widest at the middle, very shallowly trans- 
versely depressed below the base, the surface closely and finely punctured; legs ( ¢ ) comparatively short, 
black, the tarsi flavo-testaceous, the base of the tibize testaceous, the four anterior femora slender, the hind 
femora exceedingly broad and stout, the anterior tibiz slightly hooked at the inner apical angle. 
Length 13 millim. (¢.) 
Hab. Guatemata, Zapote (Champion). 
One male example. This insect may be known at once from the other unicolorous 
black species here described by the short appressed silky pubescence and more opaque 
surface. The antenne have their joints 4-10 subtriangular, broad, and somewhat 
flattened. The thorax has four depressions, two on each side of the disc. The hind 
femora ( 3 ) are exceedingly stout and broad, and have on the inner side at the middle 
an indistinct tooth. The anterior tibie are scarcely more curved than the intermediate 
pair. 
31. Xylophilus argentatus. (Tab. VIII. fig. 23, ¢.) 
Elongate, rather narrow, parallel, black, opaque, very densely clothed with fine,-scale-like, closely appressed, 
bluish-white, submetallic pubescence; the labrum and oral organs piceous-brown ; the elytra each with a 
very sharply defined, large, subtriangular, lateral patch a little below the middle, this patch deeply 
triangularly excised behind, occupying about two-thirds of the width of each elytron as seen from above, 
. and densely clothed with dark coppery-brown appressed pubescence. Head moderately large, closely and 
minutely punctured; eyes (¢) comparatively small, very widely separated, finely granulated, feebly 
emarginate, distant from the base of the head, the sides of the latter obliquely converging behind them ; 
antenne ( ¢) slender, moderately long, subfiliform, piceous-brown, joint 2 short, rather more than half 
the length of 3, 3-10 very gradually decreasing in length, 10 about as broad as long, 11 stouter and 
considerably longer than 10, ovate, acuminate; prothorax about as long as broad, narrower than the head, 
somewhat flattened on the disc, feebly dilated at the sides anteriorly (about as wide here as at the base), 
and the sides behind this slightly compressed, the surface closely and minutely punctured ; elytra compa- 
ratively very elongate, parallel, much wider than the prothorax, broadly and shallowly depressed below the 
base, closely and finely punctured; beneath black, densely pubescent; legs (¢) long and quite slender 
(the femora included), blackish-brown, the tarsi lighter, the hind femora simple, the tibize almost straight. 
Length 24 millim. (¢.) 
Hab. GuatEMALA, Quiche Mountains 8000 feet (Champion). 
One male example. This remarkable insect is not closely allied to any other species 
of the genus. The very dense, scale-like, bluish-white, almost silvery, pubescence 
resembles that of certain Curculionide; the general shape is elongate and Anthiciform ; 
