Casey — A Revision of the American Paederini. 29 



the most remarkable Paederids that I have observed. It is 

 very large in size, stout in form, deep black in color through- 

 out the body, legs and antennae, the head and pronotum 

 opaque and with minute sparse punctulation, the elytra one- 

 half wider than the prothorax and equal to the latter in 

 length, equal in width to the head, parallel, with distinctly 

 angulate and broadly exposed humeri, polished surface and 

 coarse deep and rather close-set, irregularly disposed punc- 

 tures; they are shorter than wide, broadly, feebly impressed 

 toward the suture, with the sutural bead distinctly elevated. 

 The abdomen is remarkable in form and size, as may be in- 

 ferred from the generic diagnosis. This species — which was 

 named Crypt, ynaxillosum by Gueriu, — measures 15.0 by 

 3.5 mm. in size. The type was given to me by Dr. Geo. W. 

 Bock, of St. Louis, and was collected by him near Guate- 

 mala City. Pyciiocrypta will include also several other large 

 Central and South American forms with broad and inflated 

 abdomen, though differing in great degree from 7naxillosa 

 in sculpture of the anterior parts,- — such as the Amazonian 

 gigas and plagijjennis and the Mexican and Central American 

 ducalis, grandis and planata, of Sharp. 



Cryptobiella n. gen.* — This is one of the small slender 



* I would include In this genus, until its status can be more accurately 

 determined, a species named Cryptobium pusillum, by LeConte. This is not 

 before me at present, but some notes and a manuscript drawing taken from 

 the original type many years ago, show that it is narrow, slender, of paral- 

 lel, compact build, dark rufo-piceous in color, with the pronotum and abdo- 

 men less dark, the head not quite as wide as the elytra and but little longer 

 than wide, rather abruptly and strongly narrowed before the eyes which are 

 moderate in size and somewhat prominent, the sides parallel behind them 

 for a short distance, then broadly rounded to the neck, which is rather less 

 than half as wide as the head, — according to the drawing, — the punctures 

 very coarse, deep and close-set throughout, almost mutually contiguous. 

 The prothorax is longer than wide, narrower than the head, with the ante- 

 rior angles distinct, the sides feebly converging and nearly straight thence 

 to the base, rather closely, coarsely punctate, with a wide, impunctate area 

 bounded by series. The elytra are scarcely as long as wide, parallel, dis- 

 tinctly shorter and much broader than the prothorax, more finely and closely 

 punctate, the punctures subserial toward the suture. Antennal scape as long 

 as the next four joints combined. Male with a small canaliculate impres- 

 sion at the middle of the apex of the fifth ventral, the sixth with a deep 

 parallel cleft three times as deep as wide. Length 5.0 mm. ; width 0.8 ram. 



