THE CINIFL(3NID/E, OR CRIBELLATA 



21 



at the base as long as the tibia itself and pointing upward at a 

 right angle with it (fig. 485) ; in muraria the corresponding pro- 

 cess is short and turned forward, and the tibia seems propor- 

 tionally longer (fig. 486). The cribellum in both these species 

 is large and can easily 

 be seen in front of the 

 other spinnerets. The 

 calamistrum extends 

 over half the length of 

 the fourth metatarsus, 

 which in volncripes is 

 slightly curved. 



Amaurobius sylvestris. 

 — This is the common 

 Amaurobius all over 

 the northern part of 

 the country. It resem- 

 bles our species of Tegenaria (figs. 

 228, 233) and may easily be mistaken 

 for them. It does not have long 

 upper spinnerets like Tegenaria, and 

 the eyes are lower on the front of the 

 head. The females (fig. 489) are 

 two-fifths of an inch long, and the 

 males a third of an inch, but with 



much longer legs. The head of the Figs. 489,490. Amaurobius sylves- 

 . . 1 • 1 *"^- — 4^9' female enlarged four 



female is almost as wide as the mid- times. 490, male palpus without 

 die of the thorax, and the eyes cover *^^ terminal joint to show the 



■' processes of the tibia. 



half its width. The front row of eyes 



are within their diameter of the front of the head. The head 

 is low in front and higher halfway between the eyes and the 

 dorsal groove. The mandibles are much swelled at the base in 

 front, as they are in Tegenaria medicinalis. The abdomen is 



