202 J. II. Emerton, 



Cambride, Mass. Sept. 3. 1901, 8 a. m. in irregular net on marsh- 

 grass (PI. 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 tristriata 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 tristriata have the 

 tarsus and palpal organ longer and more slender than in brevis, 

 the bulb is narrower, and the tube and narrow end of the tarsus 

 are twice as long as they are in brevis. The tarsal hook of tri- 

 striata is straighter and more slender than in brevis. 

 Orono, Me., Salem, and Gloucester, Mass. 



Lycosa avara, Keys. Zool. bot. Ges. Wien, 1876. 

 L. rufiventris, Banks. (Plate VII, figures 2, 2 a.) 



This spider resembles very closely L. prateusis. 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 prateusis. The 

 front row of eyes, which in prateusis 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 prateusis, so that it appears slightly 

 longer than the first row, while in prateusis it is slightly shorter; 

 the difference is, however, too small to measure and cannot be 

 seen in all specimens of prateusis. The two specimens of avara 

 examined vary in size as does prateusis. 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. 



