30 Trans. Acad. Sci. of St. Louis. 
types allied to Cryptobium in its bidentate labrum, obsolete 
pleural fold and other structural characters, but is much more 
strongly and compactly built than either that genus or 
Ababactus. It is founded upon a species sent to me from 
Colon, in Panama, by Mr. Beaumont, of parallel and moder- 
ately slender form, deep black color, with a fine apical border 
of the elytra and apices of the fifth and sixth abdominal 
segments testaceous, the antennae pale, the legs extremely 
pale flavo-testaceous throughout. The head is equal in width 
to the apical part of the prothorax, and, together with the lat- 
ter, rather coarsely, deeply and moderately closely punctured ; 
the elytra are rather longer than wide, parallel, much wider 
than the prothorax and of equal length, less coarsely and still 
more closely punctured than the anterior parts and distinctly 
impressed along the strong sutural beading. The abdomen is 
finely, not densely punctulate and shining like the rest of the 
surface. Its dimensions are 5.3 by 0.88 mm., and it may be 
named colonica n. sp. It is allied closely to the Central 
American Crypt. rostratum, of Sharp, differing in its rather 
smaller size, polished abdomen and other minor points and 
the genus will include also the Amazonian triste, of Sharp. 
Cryprospium Mann. — The two or three European species 
constituting this genus are of small size and more or less slen- 
der form, with the head notably narrow and elongate, differ- 
ing from Ababactus, to which it is most closely allied, in that 
respect, as well as in its broader prothorax andsmaller elytra, 
more elongate tarsi, less approximate gular sutures and many 
other characters of more or less importance. The surface is 
polished and devoid of minute sculpture, the punctures not 
very coarse and notably sparse, except on the elytra, where they 
are close-set and arranged without order. The surface of the 
elytra is impressed along the rather fine but distinctly elevated 
sutural bead. The basal joint of the antennae is about as 
long as the next three joints combined. The prosternum is 
circularly emarginate throughout the width at apex, with an 
exposure of whitish membrane — more or less evident through- 
out the subtribe. ? 
Monocrypta n. gen. — The completely united gular sutures, 
