AGATHIDIUM.—AGLYPTUS. 77 
5. Agathidium cognatum, sp.n. (Tab. III. fig. 2.) 
Late ovatum, haud contractibile, validissime convexum, castaneum, fortiter et irregulariter punctatum, nitidis- 
simum; capite sat parvo, prominente, sat profunde et remote punctato, clypeo antice sat profunde exca- 
vato, epistomate magno, convexo, corneo, margine anteriore rotundata, integra et leviter reflexa, ore valde 
prominente; oculis magnis, prominentibus ; pronoto brevissimo, quam caput haud longiore, triplo latiore quam 
longo, ad basin latissimo, minutissime et indistincte punctato, interstitiis glabris, nitidissimis, lateribus 
marginatis et leviter rotundatis, angulis anterioribus vix prominentibus, margine basali fere recta angulis 
fere rectis ; elytris permagnis, validissime convexis, quam caput atque pronotum latioribus et plus quam 
duplo longioribus, prope humeros latissimis, fortiter et irregulariter punctatis, interstitiis glabris, niti- 
dissimis, stria suturali leviter impressa, ab apice usque ad media extensa, lateribus rotundatis et marginatis, 
angulis subhumeralibus prominentibus, apice acuminato ; pedibus elongatis, gracilibus, tarsis gracilibus ; 
antennis articulis sex basalibus rufis, ceteris obscuris, tertio elongato, septimo atque octavo brevissimis, 
dilatatis, tribus ultimis valde incrassatis clava subfoliata formantibus. Long. corp. 1,4 lin. = 2°50 millim. 
Body broadly ovate, not contractile, exceedingly convex, strongly and irregularly punctured, castaneous, and 
very shining. Head rather small, prominent, rather deeply and remotely punctured, clypeus somewhat 
deeply hollowed in front, with the epistoma corneous, large, and convex, with its anterior margin entire, 
rounded, and slightly reflexed ; mouth very prominent; antenne with the third joint elongate, the seventh 
and eighth joints very short and much dilated internally, the last three very much incrassated, forming 
a subfoliate club, the basal six joints rufous, the remainder dusky. Thoraa very short, not longer than 
the head, three times broader than long, widest at the base, minutely and indistinctly punctured, with 
the interstices smooth and very shining; sides margined and faintly rounded ; anterior angles slightly 
prominent ; basal margin almost straight, with the angles subrectangular. Scutellum moderate, triangular, 
alutaceous. Elytra very large and broad, exceedingly convex, broader and more than twice as long as the 
head and thorax, widest near the shoulders, strongly and irregularly punctured, with the interstices smooth 
and very shining; sutural stria moderate, extending from the apex to the middle, sides rounded and 
margined, with the subhumeral angles prominent; apex acuminate. Legs long and slender ; tarsi slender, 
5-,4-,4-jointed. Underparts pale castaneous. 
Hab. Guatemata, Totonicapam 10,500 feet (Champion). One specimen. 
‘This remarkable species appears to belong to Dr. Horn’s division “ B ” of the genus 
Agathidium (ef. “Synopsis of the North-American Silphide,” Trans. Am. Ent. Soc. viii. 
pp. 219-321), and to be allied to A. estriatum. A. cognatwm may possibly be identical 
with A. estriatum; but I hesitate to identify it with that species on account of the non- 
contractile form of the body, the length of the legs, the peculiar proportions of the 
joints of the antennz, and the convexity and sculptural difference of the head. 
AGLYPTUS. 
Aglyptus, Leconte, Proc. Ac. Phil. 1866, p. 369; Horn, Trans. Am. Ent. Soc. viii. p. 307 (1880). 
Body hemispheric, not perfectly contractile. Head sessile, flat; clypeus faintly marked; antennal grooves 
distinct. Thoraw very short, transverse ; front deeply excised at the anterior angles, and rounded between 
them. Scutellum triangular. Elytra large, entire ; epipleural folds very broad. Wingsample. Antenne 
slender, 11-jointed, 1 and 2 moderately large, 3 very slender, longer than 2, 4—6 each shorter than 3, 
nearly equal to each other, 7 very large, much incrassated, 8 very small, 9 and 10 rather larger than 7, 
pedunculated, 11 much longer than 10, suboval. Palpt: mavillary long and slender, 4-jointed, 1 very 
small, 2 much longer and broader, pyriform, with the apex hollowed, 3 longer than 2, cylindrical, 4 long 
and slender, sharply pointed ; labial short and robust, 3-jointed, 1 and 2 subquadrate, nearly equal, 3 
rather longer, obtusely oval. Zabrwm large and broad, emarginate in front, with each extremity circularly 
rounded and broadly translucent, with a very long seta on each side, and several shorter sete towards the 
