282 HETEROMERA. 
triangularly flattened; epistoma short, truncate in front, and limited behind by a rather deep transverse 
groove; antenne moderately long, joints 1-7 slender, 8 distinctly wider than 7 and triangular, 9-11 
somewhat flattened, about equal in width, much wider than 8 (9 about as long as wide, 10 subtransverse, 
both widening outwardly), and together forming a distinct club, piceous, the outer joints black ; prothorax 
broad, very strongly transverse, not very convex, finely margined, the margins shallowly grooved within, 
the sides a little rounded at the middle, thence very slightly and obliquely narrowing to the base, more 
rapidly converging and very feebly sinuate anteriorly, the apex deeply emarginate, the anterior angles 
broadly and subtriangularly produced, the base strongly bisinuate, very obsoletely margined, and with 
the central portion somewhat produced and rounded in the middle, the basal foveze almost obsolete, the 
hind angles subrectangular, the surface closely and comparatively coarsely punctured (the disc similarly 
though more sparingly punctured than the head), the outer third on each side much more coarsely so and 
the punctures here longitudinally confluent, a broad, shallow, longitudinal impression on each side just 
behind the eyes; scutellum large, scutiform, smooth, cupreous in tint; elytra broad, short, subparallel in 
their basal third, widest beyond the middle, together broadly rounded at the apex, the humeri rounded 
and not prominent in front, deeply striate, the strie finely and closely punctured on the disc and more 
coarsely so at the sides, the interstices feebly convex, flatter on the disc, and very minutely and 
sparingly punctured; legs slender, the tibia coarsely roughened and punctured and distinctly pubescent ; 
beneath bronze-black, shining, slightly pubescent, the metasternum somewhat coarsely punctured at the 
sides, smoother in the middle, the ventral segments 1-3 more finely and sparingly punctured and also 
longitudinally wrinkled, and in the male very finely and closely punctured in the middle, the flanks of the 
prothorax with exceedingly coarse confluent impressions ; prosternum subhorizontal, closely punctured, 
-subacuminately produced, the apex with a small projecting point; mesosternum V-shaped, moderately 
deeply excavate, the raised sides gradually rounded off in front. Body winged. 
Length 54-53 millim.; breadth 37-33 millim. (<¢.) 
Hab. Panama, Volcan de Chiriqui (Champion). 
Two examples. This insect will be known at once from its nearest allies, V. varians, 
&c., by the structure of the antenne, ¢. g. joints 9-11 broad and somewhat flattened 
(forming a 3-jointed club) and the others comparatively slender; the short thorax and 
elytra, the former rather flat, with prominent anterior angles, and the disc longitu- 
dinally impressed on each side in front; the slender legs, broad ovate form, &c. 
NV. antennatus may possibly have to be separated from Nautes eventually; it is, how- 
ever, connected with the more typical species by intermediate forms *. 
8. Nautes breviceps. (Tab. XII. fig. 12.) 
Ovate or broad ovate, short, strongly convex, greenish- or golden-bronze, shining. Head very short, very 
coarsely, rather closely, and subequally punctured, the punctures more or less transverse in shape; epis- 
toma short, truncate in front, and not defined posteriorly ; antenne rather short, in the male reaching to 
about one third of the length of the elytra, slender, distinctly widening outwards, joints 8-10 subtri- 
angular, the apical joint half as long again as the tenth in the male, piceous; prothorax short, nearly 
twice as broad as long, convex, strongly margined, the margins very narrowly grooved within, the sides 
rather rapidly converging from the base and a little rounded before the middle, the apex broadly but not 
deeply emarginate, the anterior angles broad and somewhat rounded, the base very strongly bisinuate, 
finely but distinctly margined, and with its central portion broadly rounded and a little produced, the 
basal fovex obsolete, the surface somewhat finely and sparingly punctured on the disc and much more 
coarsely and closely so towards the sides, the punctures more or less longitudinal in form and here and there 
longitudinally confluent at the sides; scutellum broad, scutiform, smooth ; elytra short, strongly convex, 
* The fragmentary remains of an insect from Yzabal, Guatemala, in the Sallé collection, apparently represent 
a species allied to NV. antennatus. 
