298 RHYNCHOPHORA. 
at the hinder fourth (measured along the suture), strongly declivous, concave from side to side, shining, 
closely and moderately strongly punctured, its margins very oblique, pilose with long hairs, armed on 
each side with four teeth, the first and second small, at the apices of the first and third interstices 
respectively, the third, a large oblong lobe, directed backwards, flattened laterally, and subtruncate, 
separated by a deep notch from the fourth, which is smaller, triangular, subacute, and situated on the 
upper border of the apical process, the latter narrow, somewhat clubbed, slightly incurved, separated 
from its fellow by a wide interspace, not quite so deep as broad. Underside fusco-piceous ; prosternum 
wide before the anterior coxa, its precoxal border straight. Legs ferruginous. 
Hab. GtaTEMALA, Cerro Zunil (Champion). 
One specimen. This insect differs from the common type of Amphicranus in having 
the prothorax shaped somewhat as in A. fastigatus, except that it is not acutely 
produced, and in the distinct character of the elytral processes. 
12. Amphicranus hybridus, sp. n. (Tab. IX. figg. 16; 16 @, apex of elytra.) 
Cylindricus, sat nitidus, testaceus, prothoracis apice infuscato, elytris sordide stramineis, ad latera et ad apicem 
nigricantibus ; antennarum funiculo 2-articulato, clava ovali, ciliata; prothoracis apice verticaliter 
declivi, obtuso, margine everso ; elytris ad apicem oblique retusis, subexcavatis, vix productis, ad summam 
suturam emarginatis, ambitu retusionis ovali, supra bispinato, fundo ad apicem preter suturam in singulo 
elytro spinato. 
Long. 3 millim. ; lat. -8 millim. 
Cylindrical, linear, rather shining. Head fusco-testaceous, the front rather flat, dull, glabrous, subtuberculate 
over the fringed mouth ; antenne testaceous, scape slender, the funiculus apparently 2-jointed, the second 
joint short, club oval, oblique, its lower border more conyex and subangulate, the sutures curved, ciliate 
with long hairs arising from the inner face, chiefly from the basal joint, and upper border. Prothorax 
about one-half broader than long, obtusely rounded in front, with the margin explicate, the sides 
subparallel, the hind angles obtuse, the base sub-bisinuate; surface testaceous, infuscate at the apex, 
strongly convex and vertically declivous in front, rather finely asperate and shortly pubescent, behind 
moderately shining, sparsely and finely punctured, the punctures closer and subasperate over the middle 
of the base. Scutellum oblong, rounded, impressed, piceous-black. Elytra as wide as the prothorax, 
and rather more than one-third longer, separately subconvex at base, the shoulders obliquely rounded, 
sides subparallel, slightly incurved at the apices, which are shortly produced in the plane of the declivity ; 
surface sordid stramineous, with the extreme basal border, side-margins, and apex blackish, with scattered 
longish hairs near the suture, finely punctured in rows; declivity very oblique, beginning at the hinder 
third, scarcely excavate, subconvex near the suture, subconcave towards the hind angles, with thin long 
pubescence, not very shining, punctured, and bearing a truncate spine on each side near the apex of the 
suture, its margins oval, narrowly elevated, above with a short spine on each side of the suture, and 
pilose with long hairs towards the apex; the apical processes somewhat convergent, separated by an 
emargination about equal to their width and not quite so deep. Underside behind the prothorax 
infuscate ; the legs testaceous. 
Hab. GUATEMALA, near the city (Champion). 
One example. This insect has the antenne of a Pierocyclon and is probably a 
female, as the club is fringed ; I cannot see the slightest trace of a third joint to the 
funiculus. The prothorax is, however, as strongly declivous in front as in any 
Amphicranus, and the prosternum is that of the present genus. The apical processes 
of the elytra, though less prominent than in its congeners and lying in the plane of 
the declivity, are nevertheless better developed and separated by a much deeper 
intervening space than is found in any Pterocyclon. The species must at present be 
regarded as a form intermediate between that and the present genus, 
