30 Trans. Acad. Sci. of St. Louis. 



types allied to Cryptohium in its bidentate labrum, obsolete 

 pleural fold and other structural characters, but is much more 

 strongly and compactly built than either that genus or 

 Ahabactus. 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 theprothorax, 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, rostrafum, of Sharp, differing in its rather 

 smaller size, polished abdomen and other minor points and 

 the senus will include also the Amazonian triste, of Sharp. 



Cryptobium 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 alhed, in that 

 respect, as well as in its broader prothorax and smaller 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 

 lono- 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, 



