the Kamily Ciniflonide, 451 
Amaurobius sylvestris, new sp. 
Pu. X, FIGURES 1 TO lg. 
This is the common Amaurobius all over New England. The 
female is 10"" long with the cephalothorax 5™™ long, The head is 
nearly as wide as the thorax. It is low in front and rises to its high- 
est point half way to the dorsal groove. The cephalothorax is dark 
brown, darkest on the front of the head. The legs are dark brown, 
usually lighter than the thorax. In the young the colors are all 
much paler. 
The abdomen is oval, widest behind. It is dark greenish gray 
with a double row of oblique yellow or white markings on the hinder 
half, and two curved markings of the same color on the front. These 
markings run together, forming a figure which varies greatly in form 
and size in different individuals, Pl. x, fig. 1. 
The males differ but little from the females. The male palpi are 
large. The tibia is short and wide and has three long processes, the 
inner of which is slender and pointed and nearly twice as long as the 
tibia (Pl. x, figs. 1a, 10.) but not.so much curved as in figures of 
the European A. claustrarius. 
The epigynum is small, the middle lobe is small and the side lobes 
meet behind so as to completely surround it (PI. x, fig. 1¢) which is 
very different from the epigynum of A. claustrarius as figured by 
Koch. 
This species lives under stones, under leaves, and in the hollows 
of rotton trees and stumps. Fig. ly is part of a web, showing the 
arrangement of the curled threads. 
All over New England. In the White Mountains up to the high- 
est trees. 
Three specimens of this species in the museum of Comp. Zodlogy, 
Cambridge, are named by Keyserling A. claustrarius, which this 
species closely resembles. I have only young claustrarius for com- 
parison, but judging by descriptions and figures, especially those of 
L. Koch in Abh. Nat. Gesellsch. of Nuremburg, 1868, I do not be- 
lieve them the same species. 
Amaurobius ferox (Walck.) Koch., Ciniflo ferox Blk. 
PL. X, FIGURES 3 TO 3c. 
This is our largest. species. It is found only about houses and cel- 
lars, and is probably imported, as it is a common spider in Europe. 
The female is 12™™ long. Cephalothorax 6™" long, 4°" wide. 
The head is 3™™ wide and highest half way between the eyes and the 
dorsal groove, 
