fod 
TRICOLUS. 287 
The two species here referred to Tricolus are perhaps not closely related. At the 
same time they do not adapt themselves readily to any existing genus and must be 
provisionally separated, although, in the absence of adequate material, their generic 
characters have been but imperfectly studied. 
1. Tricolus ovicollis, sp. n. (Tab. IX. fige. 8, ¢; 34a, apex of elytra.) 
Mas. Subcylindricus, subnitens, piceus, antennis et pedibus fuscis ; prothorace anterius subconstricto, dorso a 
basi subeequaliter convexo; elytris postice subangustatis, subtiliter lineato-punctatis, ad apicem oblique 
excavatis, fundo fere plano, punctato, ambitu subacute elevato et in singulo elytro tridentato, dentibus 1°, 
2° parvis, 3° majore, subacuto intus curvato. 
Long. 3°2 millim. 
Male. Subcylindrical, rather shining, deep pitchy, the antenne and legs piceous-brown. Front subconvex, 
moderately shining, obsoletely punctured towards the sides, with a transverse cribriform patch over the 
thinly fringed mouth ; funiculus distinctly 3-jointed, the club moderately large, oval, flat, shortly pilose, 
with curved sutures. Prothorax about as broad as long, somewhat constricted in front and rounded in a 
sharp ellipse to the middle of the sides, thence slightly curved to the truncate, immarginate base; surface 
gradually rounded from base to apex, its anterior third asperate, behind subopaque and obsoletely 
punctured, the basal limb with fine transverse subasperate wrinkles. Scutellum subtriangular, piceous. 
Elytra as wide as, and nearly one-half longer than, the prothorax, truncate at base, humeral angles 
oblique, sides feebly rounded, gradually convergent behind, apical angles broadly rounded, the apex 
bordered, with a narrow median emargination, its outer angles somewhat distinct; surface cylindrico- 
convex, finely punctured, its posterior third obliquely excavate, the excavation oblong, narrowed in front, 
nearly flat from side to side, with the suture narrowly margined, shining, punctured, glabrous, its side- 
margins elevated, each with three teeth, the first small, close to the suture, the second larger, acute, 
before the middle, the third median, longer and stouter, incurved and bluntly pointed, the margin acute 
behind the third tooth. Underside piceous; anterior border of the prosternum everted and prominent. 
Anterior tibiz narrow, slightly curved, feebly spined, and scabrous externally ; tarsi short. 
Hab. GuaTEMALA, Cerro Zunil (Champion). 
One specimen. Save for the shape of the prothorax, the appearance of this insect 
is altogether that of a Pterocyclon. 
2. Tricolus nodifer, sp. n. (Tab. IX. fig. 4, apex of elytra.) 
Sexus? Oblongus, subnitidus, subglaber, piceus, elytris dilutioribus; prothorace semielliptico, ad apicem fortiter 
convexe declivi, margine subreplicato, dorso rugulis transversis, antice fortius, postice subtilius scabrato ; 
elytris distincte punctatis, ad apicem oblique excavatis, ambitu subcalloso, utrinque unidentato et ad 
apicem in nodum inflexum a sutura sat remotum producto. 
Long. 3 millim. 
Sex? Oblong, not cylindrical, nearly glabrous, piceous, the elytra ferruginous, with the sides and apex fusco- 
piceous. Head concealed in the type; antenne ferruginous, the scape short, club broad-oval, subconcave 
internally, with curved sutures, pubescent and thinly fringed at the apex. Prothorax longer than broad, 
the sides subparallel from the base to the middle, thence elliptically rounded to the apex, margin of the 
latter somewhat reflexed in the middle, hind angles rectangular, base transverse, laterally subimpressed ; 
surface a little lighter behind, convex from base to apex, more strongly in front, the anterior opening 
being nearly horizontal at its apex, anteriorly with rather coarse asperities, posteriorly with transverse 
subasperate ruge, finer and closer towards the base, their interspaces reticulate. Scutellum triangular, 
shining, fuscous. Elytra scarcely as wide as the prothorax and less than a third longer, subtruncate at 
base, the shoulders rounded, sides slightly rounded throughout and convergent behind, outer apical angles 
