1872.] NEW SPECIES OF ERIGONE. 753 



The form of the radial joint of the palpus in the male is very 

 strongly characteristic of this species, and affords an easy character 

 by which to determine it. An adult example of each sex were found 

 by myself under stones in the baths of Caracalla at Rome, in Feb- 

 ruary 1865. 



Erigone (Neriene, Bl.) sila, sp. n. (Plate LXV. fig. 7.) 



Male adult, length T 1 ^ of an inch. 



The colour of this very distinct species is yellow-brown, the legs 

 and palpi being pale yellow, tinged with dull orange. In its general 

 form and structure it is of the ordinary type ; but the strongest di- 

 stinct character is furnished by a prominent, somewhat oval, prow- 

 like projection of the upper part of the clypeus, just beneath the 

 eyes ; the profile line of the thorax behind the eyes is rather hollow ; 

 and the hind slope is abrupt. The eyes are in four pairs, just above 

 and behind the clypeal prominence, and do not differ greatly in size; 

 those of the fore central pair are smallest, and rather difficult to be 

 distinguished ; those of the hind central pair are rather nearer to each 

 other than each is to the hind lateral on its side ; those of each lateral 

 pair are placed obliquely, and are contiguous to each other. The 

 legs are rather short, moderately strong, and furnished sparingly 

 with hairs only. 



The palpi are short ; the radial and cubital joints are of about 

 equal length, the former being much the strongest, spreading outwards 

 in a somewhat obtusely angular form, and produced in a rather 

 curved, blunt-pointed form at the extremity on the upperside ; the 

 digital joint is rather large ; and the palpal organs are highly de- 

 veloped and tolerably complex ; a longish, black, curved, sharp- 

 pointed spine issuing from near their extremity on the outer side 

 forms a bold sweep round them ; there are also several other spiny 

 corneous projections in connexion with these organs. The abdomen 

 is oval, rather large, and of a somewhat flattened form ; and its upper 

 surface is covered by a coriaceous, finely punctured integument very 

 sparingly furnished with short fine hairs. 



An adult male of this Spider was received from Dr. L. Koch, by 

 whom it was found near Nuremberg, Bavaria. 



Erigone (Walckenaera) pallens, sp. n. (Plate LXV. fig. 8.) 



Male adult, length y 1 ^ of an inch. 



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

 palpi, are of a brightish but pale yellow-brown colour, the abdomen 

 being of a sooty drab, tinged with yellow-brown. 



The general form and structure is sufficiently ordinary, resembling 

 nearly that of E. scabricula, Westr. (TJ r .aggeris, Cambr.), and others ; 

 but it may be distinguished from others having a somewhat similar 

 conformation of the cephalothorax by its colour, as well as by the 

 structure of the palpi. 



The fore part of the caput has scarcely any distinct elevation, but 

 is rather bluff and rounded ; the height of the clypeus is scarcely 

 that of half the facial space : the eyes are in the ordinary position, 



Proc. Zool. Soc— 1872, No. XLVIII. 



