AMPHICRANUS. 297 
Elongate, cylindrical, rather shining, glabrous. Head testaceous, front subconvex, dull, with an oval elevated 
area over the mouth, the latter blackish, fringed; eyes broad oval, not deeply emarginate; antenne 
testaceous-yellow, scape slender, funiculus triarticulate, club obovate, not large, infuscate at apex, shortly 
pilose, the sutures curved, subangulate in the middle. Prothorax about twice as long as broad, slightly 
rounded at base, the hind angles broadly rounded, the sides subampliated behind, thence parallel, the 
apex produced beyond the head into an acuminate declivous peak, its side-margins nearly straight with 
the border reflexed, its apex with a strong tooth on the under surface ; above slightly curved from base 
to apex, obliquely declivous in front, testaceous, the apical process subinfuscate and roughened with fine 
imbricate asperities, behind rather dull, finely and irregularly punctured with traces of a subelevated 
smooth median line. Scutellum moderate, triangular, subimpressed, testaceous-brown. Elytra scarcely 
as wide as the prothorax and one-fourth longer, truncate at base, the humeral angles rounded, oblique, 
the sides at first parallel, somewhat convergent behind, the apices strongly produced, obliquely rounded at 
the tip, separated by a deep interspace with divaricate sides, very narrow at the base, and more than 
twice as long as its width at the apex; surface yellow-testaceous, becoming piceous at the margins of 
the excavation, finely punctured in remote rows ; excavation very oblique, beginning before the middle 
of the elytra and preceded by an impression along the suture, its surface flat in the middle, shining, 
rather feebly punctured, the margins acute, very oblique, each with three small spines above and a 
larger spine in the middle, and angulate at the junction with the apical border of the process, the angle 
somewhat inflexed; inner face of the process shining and punctured at the tip. Underside light 
testaceous; anterior opening of the prothorax embracing the head above and not extending along the 
apical process. Legs testaceous, the knees infuscate. 
Hab. Guatemaa, Cerro Zunil (Champion). 
One specimen. This singular-looking insect ought, on the structure of its prothorax, 
to be referred to Eichhoff’s genus Steganocranus; the form of the prothorax is 
reproduced to some extent in the following species, A. propugnatus. The antenna of 
Steganocranus, as figured by Eichhoff, is, however, very different from anything observed 
in the present genus, possessing a broadly triangular fimbriate club something like 
that of Pterocyclon fimbriaticorne. Whether its structure, or that of the prothorax, 
differs sexually, is unknown. 
11. Amphicranus propugnatus, sp. n. (Lab. IX. figg. 15; 154, apex of 
elytra.) 
Linearis, sat nitidus, nigro-piceus, elytris fusco-testaceis, lateribus et apice nigricantibus ; antennis pedibusque 
ferrugineis ; prothorace antice oblique convexe declivi, supra caput producto, margine apicali replicato 
medio tuberculato ; elytris distincte lineato-punctatis, ad apicem anguste productis et late separatis, 
excavatione ipsa fortiter declivi, ambitu utrinque 4-dentato, dentibus 1°, 2° parvis, acutis, 3° magno, 
subtruncato, 4° triangulari. - 
Long. 3°8 millim. ; lat. ‘9 millim. 
Linear, cylindrical, rather shining. Head black, the front convex, rather dull, glabrous, closely and finely 
punctate, impressed over the mouth, the latter fringed ; antenn ferruginous, the funiculus triarticulate, 
club rather broad obovate, pubescent, its sutures scarcely curved. Prothorax two-fifths longer than 
broad, cylindrical and parallel-sided, obliquely narrowed and produced downwards and forwards beyond 
the head but not sharply acuminate, the apical margin reflexed, rounded and quadrituberculate in the 
middle, the hind angles rounded, the base sub-bisinuate ; surface piceous-black, in front obliquely and 
convexly declivous, asperate with coarse tubercles, and finely pubescent, behind shining, with fine scattered 
punctures, not subasperate over the base. Scutellum moderately large, rounded triangular, black, shining. 
Elytra as wide as the prothorax and one-third longer, truncate at base, with the humeral angles rounded, 
the sides parallel, the apices produced into two remote slightly converging processes ; surface cylindrical, 
testaceous-brown, the sides and apex piceous-black, with distinct rows of punctures; excavation beginning 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 6, June 1905. 2 QQ . 
