770 REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. [June 21, 



In the absence of spines on the legs there is a close approach to 

 Theridion, Walck., while in their relative length they are like Liny- 

 phia, Latr. Although the development of the caput is so strong, 

 yet in the adult it would be probably found to be of a still stronger 

 and more extraordinary nature. 



Gen. Ariamnes, Thor. {Ariadne, Dol.). 



Ariamnes attenuata, sp.n. (Plate LXVI. fig. 3.) 



Adult male, length 8 lines ; length of cephalothorax | line ; length 

 of spinners If line ; length of abdomen 6i lines. 



The whole of the fore part of this Spider, including the legs and 

 palpi, is of a dull yellow-brown colour. The abdomen is of a still 

 duller hue, thinly mottled (chiefly on the sides) with small yellowish 

 silvery spots. 



The cephalothorax is of a rather flattened oblong form, the caput 

 being a little drawn out and elevated at its fore extremity, ending 

 in a short, somewhat conical point in the middle of the ocular area, 

 which is furnished with strong hairs ; some of these form a some- 

 what horn-like tuft and are curved forwards, meeting others curved 

 in an opposite direction. 



Tlie eyes are unequal in size ; those of the fore and hind central 

 pairs (the Krst being the largest) form a large square surrounding 

 the conical eminence of the caput ; the lateral pairs are rather close 

 to the others on either side ; those of each lateral pair being con- 

 tiguous to each other. 



The legs are long, very unequal in length, 1, 4, 2, 3, slender, 

 furnished with very short fine hairs only. 



The palpi are long ; the cubital joint curved, clavate, and longer 

 than the radial, which is also curved, and enlarged gradually to its 

 fore extremity ; the digital joint is large, of an oblong-oval form, 

 somewhat split or bifid at its fore extremity. The palpal organs are 

 complex, composed of variously formed corneous processes, but all 

 tolerably compact. 



Th^falces are rather small and weak, straight, and nearly vertical. 



The tiiaxillce are strong, especially at their base, inclined towards 

 the labium, and obliquely truncated at the extremity on their outer 

 sides. 



Labium short, of a somewhat subtriangular form, and its junc- 

 tion with the sternum scarcely perceptible. 



Sternum large, of an elongate triangular shape, strongly hollowed 

 or indented between the insertions of the legs. 



Abdomen narrow, and drawn out at its hinder extremity in an 

 exceedingly long tapering cylindrical form, terminating gradually in a 

 fine sharp point. The spinners are compact, and placed beneath the 

 abdomen at a distance from the cephalothorax rather exceeding the 

 length of the latter ; the produced portion of the abdomen is more 

 than seven times the length of the rest, i. e. from the spinners lo the 

 cephalothorax. The abdomen is furnished with hairs, which become 

 longer, coarser, and more abundant towards the hinder extremity. 



