Tue PseLAPHIDA OF NortTH AMERICA. 229 
eighth, tenth obconical, truncate at base, twice as wide as long, 
eleventh ovate, base truncate, wider than the tenth and a little 
wider than long. Prothorax equal in length to the width of 
the head with the eyes included, a little wider in the middle 
for about one-sixth of the length. At this point the sides 
are strongly arcuate, anteriorly and posteriorly becoming 
nearly straight, neck half as wide as the base. Disk coarsely 
and deeply punctured with two slightly marked circular 
impressions one-sixth of the distance from the neck, and a 
deeper fovea on each side near the base connected with its 
fellow by a straight conspicuous sulcus. Basal margin just 
perceptibly raised in a sharp ridge. /ytra coarsely punc- 
tured, rather depressed anteriorly, the width across the 
shoulders equal to the length of the suture, and one-eighth 
more than that of the prothorax. They are widest one-fourth 
of the length from the tip and here the width is one-third 
greater than at the shoulders, which are prominent as a 
rounded, elevated ridge. Disk not very convex, sutural lines 
straight, nearly parallel, suture depressed, discal lines rather 
sulciform at base, evanescent near the middle. <Addomen 
- very broadly margined, first dorsal as wide as the elytra, 
widening behind, length, one-fourth of the width, and with 
two entire longitudinal carine including about one - half 
of the segmental surface; posterior segments very convex, 
the margins converging. Ventral segments equal, the last, 
in the male with a small digital impression. Legs strong, 
anterior femora strongly tri-spinous. ‘Tarsi half as long as 
the tibiz the second joint just visibly longer than the third. 
Claws equally strong. 
Habitat. East and west of the Alleghenies, along the Ohio 
river to Missouri and Southern Iowa. 
C. sprnosus, Zec. Umber brown, punctate, pubescence 
short, appressed. Length, 1.9 mm. Plate VI., Fig. ro. 
Head broader than leng, tempora as long as the eye, which 
has coarse facets. Frontal tubercles more than twice as wide 
as long, separated by an ample sulcus, which is faintly pro- 
