76 SILPHIDA. 
magno, integro, flavo, ore testaceo; oculis modicis, vix prominentibus ; pronoto sat magno, validissime 
convexo, quam caput longiore, vix duplo latiore quam longo, nigro, lateribus atque basi continuo rotundatis; 
leviter marginatis, angulis anterioribus rotundatis, parum prominentibus; elytris brevibus, semiorbicula- 
ribus, quam caput atque pronotum multum brevioribus, mediis latissimis, stria suturali ab apice fere ad 
media extensa, lateribus marginatis, angulis subhumeralibus obsoletis, apice circulariter rotundato ; 
pedibus robustis, rufo-piceis; antennis brevibus, articulis quinque basalibus rufis, ceteris obscurioribus. 
Long. corp. 154 lin. =2°12 millim. 
Body perfectly contractile, orbicular, black, very smooth and shining, indistinctly marked with minute remote 
punctures. Head large and broad, rather more distinctly punctured; clypeus broad, with the margin 
rounded and reflexed, emarginate in front, the epistoma rather large, entire, and yellow; mouth 
testaceous ; eyes moderate, scarcely prominent; antennae short, with the basal five joints rufous and the 
remainder dusky. Thoraw rather large, exceedingly convex, longer than the head, scarcely twice as broad 
as long, black ; sides and base continuously rounded, slightly margined ; anterior angles rounded, moderately 
prominent. lytra short, semiorbicular, much shorter than the head and thorax, widest at the middle; 
sutural stria reaching from the apex nearly to the middle sides; margined, with the subhumeral angles 
obsolete ; apex circularly rounded. Legs robust, rufo-piceous. Underparts rufo-testaceous ; mesosternum 
carinated anteriorly ; metasternum alutaceous. 
Hab. Nortu America, Pennsylvania !, Colorado 2,—GuvaTEMALA, Cerro Zunil 4000 to 
5000 feet, Capetillo (Champion). 
This species may be known by its more evidently punctured head, and very short and 
circularly rounded elytra; it is distinguished from A. difficile by its much larger head 
and thorax. 
4. Agathidium difficile, sp. n. 
Omnino contractibile, fere orbiculare, nigrum, nitidissimum, punctis minutis, remotis, vix conspicuis impressum ; 
capite sat parvo, clypeo antice lato, haud emarginato, epistomate fere rudimentario ; oculis modicis, promi- 
nentibus ; pronoto validissime convexo, brevissimo, punctis exiguis remotis indistinctis impresso, inter- 
stitiis levissime alutaceis, quam caput parum longiore, duplo latiore quam longo, nigro, lateribus atque basi 
continuo rotundatis, leviter marginatis, angulis anterioribus rotundatis, valde prominentibus ; elytris semi- 
orbicularibus, quam caput atque pronotum nec longioribus neque latioribus, mediis latissimis, nitidissimis, in- 
distincte alutaceis, linea tenui suturali per tota extensa atque alia magis profunda ab apice usque ad media 
impressis, lateribus marginatis, angulis subhumeralibus obsoletis, apice haud acuminato ; pedibus modicis, 
rufo-piceis ; antennis sat gracilibus, rufescentibus, clavis obscurioribus. Long. corp. 1, lin.=2-12 millim. 
Body perfectly contractile, almost orbicular, black, very shining, marked with minute, remote, indistinct punc- 
tures. Head rather small; clypeus broad and not emarginate in front; epistoma almost rudimentary ; eyes 
moderate, rather prominent ; antenne rather slender, rufescent, with the club dusky. Z'horax very short 
and very convex, indistinctly marked with very minute remote punctures, with the interstices faintly 
alutaceous, a little longer than the head and twice as broad as long, black; sides and base continuously 
rounded and lightly margined ; anterior angles rounded and very prominent. Scutellum large, triangular, 
smooth, and shining. lytra semiorbicular, not longer nor broader than the head and thorax, widest at 
the middle, very shining, indistinctly alutaceous, with a fine line on each side of the suture, extending 
from the base to the apex, and a shorter and more deeply impressed line from the apex to the middle; 
sides margined, with the subhumeral angles obsolete; apex circularly rounded. Legs moderate, rufo- 
piceous. Underparts rufo-piceous. 
Hab. Mexico, Cerro de Plumas (/ége). 
This species differs from the others here described in its small size, comparatively 
smaller head, and shorter thorax; and also by the circularly rounded elytra, and the 
line on each side of the suture, in addition to the usual sutural stria. 
