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COLYDOBIUS. 437 
COLYDOBIUS, gen. nov. 
Corpus gracile, subcylindricum. Oculi liberi, a prothorace distantes. Prosternum anterius truncatum, angulis 
anterioribus nullo modo productis, processu post coxas crasso. 
The little insects for which I establish this genus have a different structure of the 
prosternum from Tenebroides, and can, in addition to this, be distinguished at a glance 
by the fact that the eyes are placed far in advance of the front margin of the thorax. 
The mandibles are thick, toothed internally before the apex. The eyes are not emar- 
ginate, and are placed close to the base of the antenne. The antennary grooves are 
short and strongly convergent. ‘The mentum is not visible, being directed to the interior 
of the mouth. The submentum consists of an elongate quadridentate margin. ‘The 
palpi and antenne are the same as they are in Tenebroides, and the epistome also is 
formed as in that genus. The prothorax is elongate, with a very fine lateral margin ; 
the flanks of the prosternum are not in the least prolonged in front, the prosternum 
extending in a quite straight line from side to side; the cox are placed very near to 
the side margins; and the prosternal process is protuberant behind. ‘The process of 
the abdomen behind the hind coxe is rather protuberant. The epipleure are extremely 
slender. The general facies is rather that of Rhizophagus or some of the Colydiide 
than of Trogositide. 
1. Colydobius divisus, sp.n. (Tab. XII. fig. 25.) 
Angustus, parallelus, subcylindricus, rufus, supra piceus, elytrorum dimidio posteriore rufo-testaceo. 
Long. 4 millim. 
Hab. Panama, Bugaba (Champion). 
Head and thorax rather finely punctate ; the latter elongate, slightly narrowed behind, 
all the angles a little rounded, the lateral and basal margins fine, the lateral margin in 
front placed low down and quite obsolete. Elytra slender, with very regular series of 
fine punctures, and a very fine seriate, interstitial punctuation. ‘Two specimens. 
2. Colydobius signatus, sp. n. 
Gracilis, subcylindricus, piceus, supra nigricans, elytris plagis quatuor rufo-testaceis ; antennis pedibusque 
piceo-rufis. 
Long. 4 millim. 
Hab. Guatemana, Volcan de Atitlan (Champion). 
Antenne rather long, red, with elongate, somewhat laxly articulated, picescent club. 
Head elongate, broadly, but slightly, depressed on the middle in front, rather closely 
and finely punctate. Thorax elongate, very convex transversely, the lateral margin 
excessively fine, scarcely visible from above; the surface black, shining. Elytra with 
fine series of punctures, which become effaced behind, and with a fine interstitial punc- 
tuation; each with a large reddish-yellow mark at the shoulder, and a smaller one 
behind the middle. A single specimen. 
