186 J. H. Emerton, 
The epigynum is simple, with a middle lobe a little longer than 
wide. 
The male palpi have the patella long and widened at the end, 
with a large tooth on the under sider. The tibia is very short and 
has a tooth on the upper side as long as that on the patella but 
more slender. The palpal organ has a slender pointed process at 
the end, and a short and flat basal hook, Pl. Il, fig. 6. 
Three-mile Island and Jaffrey, N. H., Mt. Tom, Mass., Simsbury, 
Conn., Balsam, North Carolina. 
Caseola, new genus. 
General appearance like Ceratinella, but without any hard plate 
on the abdomen. The cephalothorax is as wide as long, in the male 
aluceps, elevated in front. The two rows of eyes are of equal 
length the upper middle pair as far from the front middle pair as 
they are from each other. The abdomen is oval, not much larger 
than the cephalothorax and covered with scattered hairs. The 
legs are short and differ little in length. The mandibles have 
three very small teeth on the inner side of the claw groove and 
two or three larger ones on the front. The maxilla are longer 
than wide and a little pointed at the inner corners. The sternum 
is as wide as long, widest between the first and second legs and 
extends backward between the fourth legs, where it is as wide as 
the coxe. The male palpi have the patella and tibia both short 
and the palpal organ simple with a slender curved tube, at the base 
of which is a flat process widened and oval at the end directed 
outward. 
Caseola herbicola, new. (Plate H, figures 1 to 1d.) 
1.5 mm. long and resembling Ceratinella, but without any hard 
spots on the abdomen, which is covered with scattered stiff hairs. 
The color is pale and whitish, without the orange which is usual 
in Ceratinella. The cephalothorax is darkened a little toward the 
head, and in the male is browner than in the female. The cephalo- 
thorax is nearly as wide as long, very little narrowed or raised 
toward the head in either sex. There is nothing peculiar in the 
arrangement of the eyes. The front middle pair are as usual smallest 
and about two-thirds the diameter of the upper middle eyes, with 
which they make a quadrangle slightly higher than wide. The 
front row of eyes is almost as long as the upper row, with the 
lateral eyes a little raised above the head. The mandibles have 
four or five very small teeth each side of the claw. The sternum 
