194 J. H. Emerton, 
All the appendages of the palpal organ are long and slender. The 
tube itself starts at the base under the tarsal hook and extends 
more than half around the tarsus, and is supported through nearly 
its whole length by a stouter process with a long hook at the end, 
usually dark-colored and having a short tooth near its base on the 
inner side of its curve. At the base of this stout process is another 
about half as long; which is soft and white and ends in a blunt 
point near the tip of the tube. 
Hammond’s Pond woods, Brookline, Carlisle Pines. 
Tmeticus corticarius, new. (Plate VI, figures 4, 4a, 4b.) 
This species had only been found singly in Cambridge and in 
New Haven, Conn., until trees around Boston and Providence were 
banded with cloths to trap the Gypsy moth caterpillars in 1905. 
It then appeared in considerable numbers under these cloths in both 
places from July until October. 
The length is 2.5 mm., the males and females being of the same 
size, the males having only slightly longer legs and smaller abdomen. 
The color is dull gray, the legs and cephalothorax yellowish, and 
the abdomen almost black. The front of the head is narrow and 
rounded, and the eyes not far apart. The epigynum is three-lobed, 
the outer lobes forming part of a semicircular plate a third as wide 
as the abdomen. The male palpus has the tibia very short and 
extended upward and downward. The upper process is very cons- 
picuous when the palpus is seen from the side. It is half as long 
as the tarsus, and curves slightly forward so as to fit the tarsus 
if both are brought together. 
Tmeticus brunneus, Em. Trans. Conn. Acad. 1882. (Plate IV, 
figures 7, 7a, 7b.) 
This has been found again on Mt. Washington by Mrs. Slosson, 
and is in Mr. Banks’s collection. It is closely related to T. tarsalis 
and 7. maximus, especially the latter; the upper projection of the 
tibia, however, is distinctly more pointed and larger than in maximus, 
and the tarsal hook is longer. The epigynum is also longer and 
projects more from the surface of the abdomen than in maximus. 
Erigone brevidentatus, new. (Plate II, figures 10b, 10c.) 
A small species not much over 1 mm. in length. The colors are 
the usual brown and gray, rather pale in all three specimens. The 
cephalothorax is only a little elevated behind the eyes, and there 
are no spines around the edge. The mandibles have one long 
