CRYPTOBIUM. 523 
less deep and definite punctuation of the head and the less fine sculpture of the wing- 
cases will not allow it to be united with C. tenuicorne or its immediate allies. The 
only example before me is in a very decayed condition, but is no doubt a female, as it 
possesses no positive sexual marks. 
41. Cryptobium rugosipenne. 
Minus gracile, nigrum ; abdomine piceo, antennis rufis, pedibus testaceis ; capite subquadrato, densius subtiliter 
argute punctato, subnitido ; prothorace densius minus fortiter punctato, linea mediali levigata minus lata ; 
elytris quam prothorax paullo longioribus, densissime vix subtiliter punctatis, rugulosis. 
Long. 9 millim. 
Hab. Panama, Pefia Blanca 4000 feet (Champion). 
Antenne neither elongate nor slender. Head very closely punctate, but the fine 
interstices are distinctly shining, and the impunctate space behind the labrum is quite 
polished. Thorax less cylindric than in the allied species, the sides being a little 
dilated in front of the middle, its punctuation very close, its impunctate line disap- 
pearing in front, and encroached on behind by the punctuation so as to be compressed, 
and in this part rather deeply canaliculate. 
The unique example, which is in a very decayed condition, is apparently, judging 
from the absence of conspicuous sexual marks, a female. 
Banks of rapid streams in the forest (Champion). 
42. Cryptobium confine. 
Gracile, nigrum; antennis rufis, pedibus testaceis, coxis rufo-obscuris; capite breviter suboblongo, dense sub- 
tiliter argute punctato, subnitido; prothorace cylindrico, nitido, dense punctato, linea mediali angusta 
impunctata; elytris quam prothorax longioribus, densius vix subtiliter punctatis, subnitidis. 
Long. 83 millim. 
Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet (Champion). 
This species, though closely allied to C. rugosipenne, is a much more slender insect, 
with very much smaller head, which is even slightly narrowed behind the eyes, instead 
of being slightly dilated; the cephalic punctuation is dense and rather definite, but on 
the space between the antennal tubercles there are only a few punctures, these being of 
larger size. The thorax and elytra are less elongate than in C. tenuicorne, to which, on 
account of its stature and slender form, C. confine is very similar. ‘The only example is 
a female, and has lost the greater part of its antenne. 
43. Cryptobium arduum. 
Gracile, nigrum; antennis coxisque rufis, pedibus testaceis; capite oblongo-subquadrato, densius subtiliter 
argute punctato, subnitido; prothorace cylindrico sed anterius magis evidenter angustato, dense punctato, 
linea mediali arguta impunctata; elytris quam prothorax longioribus, densius minus fortiter punctatis, 
subrugulosis. 
Long. 83 millim. 
Hab. Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 
3 XX 2 
