CRYPTOBIUM. 509 
3. Cryptobium salvini. 
Elongatum, nigrum, nitidum; antennis tarsisque rufis, illarum articulo basali piceo; capite dense fortiter 
punctato, anterius nitido et impunctato; prothorace crebrius fortiter punctato, medio longitudinaliter 
levigato; elytris quam thorax longioribus crebrius fortiusque punctatis ; abdomine parce punctato. 
Long. 13 millim. 
Hab. GuateMata, Chinautla 4100 feet (Salvin). 
So far as I can judge from a single female, this is a species allied to C. wmbratum and 
C. collare, but with numerous points of distinction. The black colour, the narrower 
form, the more coarsely punctate head, shining in front, cannot fail to distinguish it 
from C. collare; while from C. umbratum the sparse punctuation of the hind body 
renders it quite distinct. The example is destitute of positive sexual marks. 
4, Oryptobium grandiceps. 
Latum, subdepressum, nigrum ; antennis pedibusque rufis ; capite majore, dense fortiter punctato, opaco ; thorace 
parum elongato, cylindrico, crebrius fortiter punctato, medio longitudinaliter levigato ; elytris quam thorax 
evidenter longioribus, dense fortiter subrugulose punctatis, parum nitidis ; abdomine lato, dense punctato. 
Long. 16 millim. 
Hab. Guatemata, Tamahu (Champion). 
Of this species, an ally of C. collare, a single example only of doubtful sex has been 
found. It has a large head, with elongate mandibles, and will be readily recognized by 
its more densely punctate surface; the fourth ventral plate has on the middle a nearly 
circular setigerous impression, and the preceding segment a long transverse line, with 
elongate, erect sete: springing from it. 
5. Cryptobium cephalotes. 
Cryptobium cephalotes, Solsky, Hor. Soc. Ross. v. p. 141°. 
Hab. Mxxico1, Oaxaca (Hoge). 
I have seen only a single example that agrees at all well with Solsky’s description, and 
am not quite sure that the determination is correct even in this case. Two other 
examples differ in that the under surface and hind body are in one picescent, in the 
other nearly black. But I am of opinion that all are examples of one species variable 
in colour. Solsky has only defined the sexual characters imperfectly; the male has, in 
addition to the lobe of the fourth segment, a large patch of very fine punctuation and 
pubescence, and a rather large transverse setigerous impression on the preceding 
segment. The female has a rather small curved depression, open behind, on the 
third segment. 
6. Cryptobium stipes. 
Subdepressum, parum latum, nigrum ; antennis rufo-obscuris, pedibus testaceis ; capite elongato, oblongo, opaco, 
densius fortiterque punctato ; prothorace cylindrico, nitido, dense fortiterque punctato, medio linea haud 
