1878.] 393 [LeConte. 
Massachusetts and Lake Superior, two females. Differs 
from C. pallipes by the head being longer and more parallel, 
and the antenne yellow instead of brown. The elytra are 
more finely punctured, while those of the prothorax are quite 
pereeptibly coarser. 
41. [12.] Cryptobium tumidum, n. sp.—Slender, blackish- 
brown, pubescence fine. Head sub-ovate, gradually a little wider behind 
the eyes, which are rather smaller than in the two preceding species ; 
densely punctured, front less shining, nearlysmooth. Prothorax elongate- 
oblong, slightly but perceptibly narrower behind, smooth dorsal stripe 
broad, ill-defined, sides sparsely and finely punctured. Elytra not longer 
than the prothorax, densely rather finely punctured. Abdomen finely 
punctured. Antenne, palpi and legs dull ferruginous. Length 9.5 mm.; 
.379 inch, 
3 6th ventral segment deeply emarginate for one-half of its length. 
San Jose, California; found by me in March, 1850. 
42. [15.] Cryptobium prospiciens, n. sp.—Brown, less shining ; 
pubescence fine. Head finely not densely punctured, semi-circularly rounded 
behind the eyes, which are large and prominent; front produced into a 
broad muzzle with high antennal ridges, so as to make a broad frontal 
concavity, which is nearly smooth, marked only by a few large punctures. 
Prothorax elongate, slightly rounded on the sides, narrower than the head ; 
smooth dorsal stripe wide, not distinctly defined ; sides very sparsely and 
finely punctured. Elytra not longer than prothorax, finely punctured. 
Abdomen not shining, scarcely perceptibly punctulate. Antenne, palpi 
and legs paler brown. Length 8 mm.; .32 inch. 
3 3d ventral segment with a long triangular lobe nearly acute at tip, 
setose at the sides and end; there is a small transverse fovea at the 
middle ; 6th ventral segment triangularly emarginate for nearly half its 
length. @ 3d ventral with a round flat sliglitly elevated tubercle. 
Bosque Co., Texas, Mr. G. W. Belfrage; Arizona, Dr. 
Horn. This species is an excellent example of what is not 
unfrequently seen in other families ; the union of characters 
which define two or more separate groups of species, with 
some peculiar character. In this instance the sexual charac- 
ters of the o'o% of the two groups of § A are united, but the 
form of head is quite different from that seen in either of 
them. 
43. [17.] C. Lugubre, n. sp.—Slender cylindrical, shining black ; legs, 
palpi and antenne yellow, the latter darker at the base. Head as long as 
the prothorax and very little wider, sparsely strongly punctured, punctures 
PROC. AMER. PHILOS. soc. xvi. 101. 2W. PRINTED APRIL 20, 1878. 
