CRYPTOBIUM. 527 
Hab. Mexico, near the city (Flohr, coll. Sharp), Cordova, Playa Vicente (Sallé), 
Jalapa, Oaxaca (Hoge) ; GuaTEMALA (Sallé), near the city, and San Gerénimo (Champion). 
Head rather narrow, not much more than half as broad as the elytra, sparingly 
but coarsely punctate, somewhat shining, with large convex eyes. Thorax slightly 
narrower than the head, the sides a good deal rounded in front, very slightly narrowed 
behind, coarsely but sparingly punctate, there being a broad impunctate space along 
the middle, and on either side of this an irregular double series of punctures imper- 
fectly separated from the lateral punctuation; the surface dull, minutely coriaceous. 
Elytra very distinctly longer than the thorax, with remarkably deep coarse punc- 
tuation. 
In the male the terminal ventral plate is broadly and rather deeply emarginate ; but 
the base of the emargination in the middle is armed with a slight angular projection ; 
the lateral lobe of the armature is much broader than in the female, the under margin 
is rounded, the upper margin nearly straight, but with a small upward curvature at 
the apex, causing it to be minutely acuminate; there is also an obscure setigerous 
impression on the third ventral plate, and a transverse pubescent line on the next 
segment. 
This is one of a group of species characterized by the peculiar construction of the 
external genital armature. It varies much in colour; very red examples were labelled 
““ C. nigriventre, Chey.,” in Sallé’s collection. A very dark example of the male sex 
from Guatemala city is figured. 
51. Cryptobium cognatum. 
Minus depressum, nigricans ; capite prothoraceque dilute rufo-castaneis, elytris piceis, margine summo apicali 
angustissime pallido, abdominisque segmentis duobus ultimis posterius flavo-marginatis ; antennis rufis, 
pedibus pallide flavis ; prothorace minus nitido, utrinque crebre punctato ; elytris densissime, profunde, vix 
fortiter punctatis, subrugosis. 
Long. 9 millim. 
Hab. Panama, Tolé, San Feliz (Champion). 
This species is very closely allied in all respects to C. nigriventre, except that the 
punctuation of the elytra is much denser and finer, and the head and thorax generally 
more slender. The male has a small setigerous impression on the third ventral plate, 
and an elongate transverse pubescent line on the next plate; the terminal segment is 
broadly but slightly emarginate behind, and with a very slight angular projection in 
the middle of the emargination. 
Seven examples, agreeing closely with one another, were met with. Sandy banks of 
rivers (Champion). 
52. Cryptobium perforatum. 
Minus depressum, nigricans ; capite rufo, antennis pedibusque testaceis, elytrorum margine summo abdominisque 
