DELTOSTETHUS— CRYPTOPLEURUM. 115 
very dull, being entirely covered with a peculiar excessively minute sculpture, amongst 
which can be detected a few larger punctures; the lateral grooves on the wing- . 
cases are broader than those near the suture, and their sculpture therefore more 
conspicuous. The broad pentagonal (or nearly hexagonal) space on the middle of 
the metasternum is shining and coarsely punctate, the lateral parts being dull. 
The species is apparently rare, one specimen only coming from each locality. The 
individuals show minute differences, but none that could with propriety, on such 
evidence, be considered specific. The individual from Panama has on the very black 
elytra a transverse fascia of minute yellow marks behind the middle. 
2. Deltostethus palpalis. 
Rotundato-ovalis, latissimus, posterius acuminatus, niger, nitidus ; antennarum basi, palpis pedibusque testaceis ; 
capite dense punctato, opaco; protherace in medio sparsim subtiliter, versus latera fortius punctato ; 
elytris late profundeque sulcatis, sulcis crenatis, interstitiis impunctatis. 
Long. 14, lat. fere 1 lin. 
Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 
Basal joint and club of antenne very elongate, the middle joint of the club being 
but little transverse. Maxillary palpi also elongate and slender, the second joint 
comparatively little dilated. The pentagonal space on the metasternum is densely 
and coarsely punctate. 
This species, although bearing a great resemblance to J. sulcatus, differs so much 
in the details of structure, that it may perhaps prove to be generically different. 
The palpi are elongate and slender, the anterior coxe more widely separated, and the 
angles of the mesosternal tablet are so much effaced that it is almost circular in 
form: this latter character is sufficient to distinguish the insect from all other species 
of the Cercyon group of genera. 
CRYPTOPLEURUM. 
Cryptopleurum, Mulsant, Col. Fr. Palp. p. 188. 
This genus at present comprises five species, viz. two European and one North- 
American, the others being from Ceylon and the Cape of Good Hope. Whether these 
will ultimately all prove congeneric, however, is quite doubtful. The Mexican species 
here described differs, indeed, structurally from the European species, the middle pieces 
of the pro- and mesosternum being much smaller, and the mentum very short, with its 
base but little protuberant. It would, however, be unadvisable to separate the insect as 
a distinct genus on these accounts from its allies. 
1. Cryptopleurum impressum. 
Rotundato-ovale, convexum, nigrum, nitidum, omnino tenuissime pubescens, supra sat crebre et fortiter 
: punctatum ; elytris ad basin leviter, ad apicem profunde striatis ; antennis, pedibus elytrorumque apice 
rufis, palpis testaceis ; subtus metasterno fortiter punctato, nitido, in medio late impresso. 
Long. 4, lat. 3 lin. 
QQ 2 
