202 Jj. H. Emerton, 
Cambride, Mass. Sept. 3. 1901, 8 a. m. in irregular net on marsh- 
grass (Pl. V, fig. 5.) Position of mandibles while pairing (fig. 5a.). 
Pachygnatha tristriata, Keysl. 1882. (Plate V, figures 6 to 6d.) 
This species is not the same as brevis. The size is about the 
same as brevis, but both the cephalothorax and abdomen are slightly 
longer and narrower. The cephalothorax has three stripes in both 
species, but the abdomen of ¢ristriafa has the dorsal marking with 
straight black edges instead of scolloped as in brevis. The four 
middle eyes are raised above the head with the upper pair higher 
than the top of the cephalothorax, while in brevis the eyes are 
lower than the highest part of the cephalothorax. The cluster of 
middle eyes is as far above the mandibles as it is high. In au- 
tumnalis the upper middle eyes are larger than the others and 
farther apart, and the cluster of middle eyes is much higher than 
it is distant from the mandibles. In males the differences are more 
distinct than in females. The male palpi of tvvstriata have the 
tarsus and palpal organ longer and more slender than in 6revts, 
the bulb is narrower, and the tube and narrow end of the tarsus 
are twice as long as they are in drvevis. The tarsal hook of ¢ri- 
striata is straighter and more slender than in dvevis. 
Orono, Me., Salem, and Gloucester, Mass. 
Lycosa avara, Keys. Zool. bot. Ges. Wien, 1876. 
L. rufiventris, Banks. (Plate VU, figures 2, 2a.) 
This spider resembles very closely L. pratensis. The light stripe 
on the cephalothorax widens behind the eyes, and has a middle dark 
line and a broken dark line each side of it as in pratensis. The 
front row of eyes, which in pratensis is straight, has in avara the lateral 
eyes a little lower than the middle pair. The eyes of the second 
row are a little larger than in pratensis, so that it appears slightly 
longer than the first row, while in pratensis it is slightly shorter ; 
the difference is, however, too small to measure and cannot be 
seen in all specimens of pratensis. The two specimens of avara 
examined vary in size as does pratensis. The most distinctive 
character of avara is the form of the epigynum as shown in fig. 2. 
At first sight it shows a pair of round holes, and it is only by 
rubbing away the hairs that the shape of the middle lobe can be 
seen. This is anchor-shaped with the pointed ends curved around 
so that they point directly forward. There is a slight projection in 
the middle. At the front end the middle lobe widens, and its edges 
are continuous with the anterior borders of the two large holes. 
