LISSOBARIS.—CYLINDROCERUS. 237 
Fully developed ¢. Prosternum produced and somewhat raised posteriorly, armed with a small tubercle 
behind each anterior coxa; prosternal sulcus dilated anteriorly into a very broad, laterally-rounded, 
pilose depression ; metasternum and first two ventral segments very broadly excavate down the middle, 
sparsely punctate, and also set with a few erect hairs, the fifth segment with a transverse, punctate, 
sparsely pilose depression at the apex; femora sulcate and ochreo-ciliate along their lower face ; tibie 
shallowly sulcate, carinate, and ochreo-ciliate within, the anterior and intermediate pairs somewhat. 
bowed at the apex. 
Undeveloped ¢. Prosternum less produced and unarmed behind the coxe; prosternal sulcus parallel-sided, 
bare; first ventral segment broadly excavate, bare ; femora not sulcate beneath, glabrous; tibie sparsely 
ciliate within. 
Length 63-84, breadth 3-4,), millim. (¢ 2.) 
Hab. Costa Rica, Carrillo (Underwood: 3); Panama, Volcan de Chiriqui 2500- 
4000 feet (Champion: ¢ @). 
Three specimens, evidently belonging to one species, the great difference in the two 
males notwithstanding. The Chiriqui pair are much alike, except that the male 
has the first ventral segment broadly excavate and the anterior tibize are curved at 
the apex. 
CYLINDROCERUS. 
Cylindrocerus, Schéuherr, Cure. Disp. Meth. p. 810 (1826); Gen. Cure. iii. p. 789; viii. 1, p. 260 
(part.) ; Lacordaire, Gen. Col. vil. p. 235. 
The species of this Tropical-American genus, nine of which are now recorded from 
within our limits, may be known by the following characters : 
Rostrum elongate, strongly arcuate, becoming gradually or abruptly thinner and smoother in its apical half, 
especially in the 9, the antenne usually inserted at (2) or at a little beyond (3) the middle, the 
antennal club stout, elongate or oblong-ovate, at least as long as joints 3-7 of the funiculus united, the 
sutures often obsolete ; mandibles rather long, straight on their inner edge, dehiscent at the tip; eyes 
large; prothorax more or less conical; scutellum free, small, subquadrate ; elytra triangular; pygidium 
not visible; prosternum more or less hollowed or excavate in the middle before the anterior cox, 
bifoveate or with a deep transverse pit in front (to receive the apex of the scape in repose), in the fully- 
developed ¢ armed with two spines or tubercles, and with a deep circular cavity between them ; 
mesosternum depressed ; femora clavate, unarmed ; tibie in the typical forms feebly unguiculate, the 
anterior pair in the ¢ often ciliate within ; anterior tarsi sometimes hairy in the ¢; tarsal claws long, 
divergent ; body more or less rhomboidal, flattened above, polished, usually with squamose spots or lines, 
above and beneath. 
As thus defined, and as restricted by Lacordaire, Cylindrocerus includes Schénherr’s 
first section only of the genus, all these species having the general facies of the 
‘‘Madarides.” ‘The male-characters are well-marked, though varying in development, 
but there is no appreciable difference in the length of the antennal club in the two 
sexes. 
a. Third elytral interstice with a line of ochreous scales reaching to near the 
apex * ; pro-, meso-, and metapleura, and the sides of the abdomen, 
with an interrupted series of ochreous spots. 
* The fifth interstice is similarly marked in some of the S.-American forms, 
