CRYPTOBIUM. 513 
coarsely, and regularly punctate, a rather narrow distinct space along the middle 
smooth. LElytra flat, a little longer and much broader than the thorax, coarsely and 
very densely punctured, a little shining. Hind body finely and moderately closely 
punctate, slightly shining. 
The unique example is no doubt a female, as there are no positive sexual marks. 
14. Cryptobium rubeculum. 
Parum latum, ferrugineum ; pedibus testaceis; capite suboblongo, opaco, dense subobsolete punctato ; prothorace 
elongato, crebrius punctato, medio longitudinaliter sat late levigato; elytris quam prothorax paullo longi- 
oribus, dense, minus fortiter et profunde punctatis, subrugosis, haud nitidis. 
Long. 11 millim. 
Hab. Mexico, Pinos Altos in Chihuahua (Buchan-Hepburn). 
This is a more slender insect than C. lwridum, with a narrower head, which, moreover, 
is not so dull in colour; in shape it comes much nearer to C. terminatum, from which 
it is readily distinguished by the unicolorous hind body. The antenne are elongate ; the 
punctuation of the head, though coarse, is indefinite and not deep, but on the middle 
between the eyes it is distant and finer, and the surface there is not quite dull. The 
thorax is not greatly narrower than the head and elytra, and only a little shorter than 
the latter; the punctuation of the hind body is scanty and indistinct. The male has a 
short setigerous space on the third ventral plate, and a small circular fovea on the 
following segment; this segment, moreover, is produced behind to form an extremely 
broad, rather short, lobe. The female is without positive sexual marks. 
Three examples are before me. 
15. Cryptobium zquale. (Tab. XIII. fig. 15.) 
Angustulum, subcylindricum, nitidum, rufulum; abdomine elytrisque plaga magna discoidali nigricantibus, 
antennis pedibusque testaceis ; elytris haud elongatis, fortiter subseriatim punctatis. 
Long. 9 millim. 
Hab. Guaremaa (Sailé), near the city, San Gerdénimo, Tocoy (Champion). 
Head elongate and narrow, dull, sparingly and rather coarsely punctate. Thorax a 
little narrower than the elytra, very shining, pale red, coarsely and moderately closely 
Fanictate, with a rather broad regular space along the middle impunctate. LHlytra a 
little longer than the thorax, coarsely and closely punctate. Hind body quite sparingly 
punctate. Legs yellow. 
The male has a broad, rather short lobe, subattenuate behind, on the fourth segment 
beneath, and a small, rather indistinct setigerous space on the same segment, there 
being on the preceding one a small transverse setigerous space; the lobe varies greatly 
in its development, and may be entirely absent. The female has no positive sexual 
characters. 
An example of the male sex from Tocoy is figured. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, October 1885. 3U0U 
