STUDIES IN AUSTRALIAN ARANEID^. 



No. 4. 



By W. J. Rainbow, F.L.S., F.E.S., Entomologist. 



(Plate iii. and text fig. 1). 



Familij DICTYNID^. 



(rf'.fms Amaurobius, C. Koch. 



A.MAUROBIUS SOCIALIS/ .y}. aov. 



$ Cepholathorax, 5-5 mm. long, 3-5 mm. broad ; abdomen, 61 

 mm. long, 4*2 mm. broad. 



Cephalothorax. — Obovate, dark brown, hairy. Pars cephalica 

 large, sti'ongly arched. Pars thoracica broad, sloping posteriorly, 

 arched, median depression and normal grooves distinct. 



Eyes. — Eight, disposed in two transverse, nearly parallel rows, 

 and occupying almost the entire space in front ; front row almost 

 straight, rear- row gently recurved. Of the front row the median 

 pair ai'e very slightly the largest, and are placed closely together, 

 nearly touching one another ; each lateral eye is sepai'ated from 

 its median neighbour by a space equal to once its own diameter ; 

 those compi'ising tlie rear row are slightly smaller than their 

 anterior neighbours ; the median pair are separated from each 

 othei" by a space equal t(i aliout twice their individual diameter, 

 and from their lateral neighbours by about two and a half 

 diameters. 



Lexis. — Robust, yellow-brown, clothed with long hairs, and 

 armed with strong spines. Measurements (in millimetres): — 



1 SocirilLs — Social, sociable. 



