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. maxillosum by Guérin, — 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. Pycnocrypta will include also several other large 
Central and South American forms with broad and inflated 
abdomen, though differing in great degree from mazillosa 
in sculpture of the anterior parts, — such as the Amazonian 
gigas and plagipennis and the Mexican and Central American 
ducalis, grandis and planata, of Sharp. 
CRYPTOBIELLA n. gen.* — This is one of the small slender 
* T 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 thesuture. 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 mm, 
