24 Mr. J. Blackwall on newly discovered species of Araneidea. 

 Neriene vigilax. 



Length of the male Jyth of an inch ; length of the cephalo- 

 thorax ^'^ ; breadth ^-^ ; breadth of the abdomen Jf ; length of a 

 posterior leg ^ ; length of a leg of the third pair y'y. 



Legs haiiy and of a red colour tinged with brown ; the fourth 

 pair is the longest, then the first, and the third pair is the 

 shortest ; each tarsus is terminated by three claws ; the two su- 

 perior ones are curved and pectinated, and the inferior one is 

 inflected near its base. Cephalo-thorax oval, convex, glossy, with 

 a slight indentation in the medial hne; it has a dark brown 

 tint, the lateral margins being the darkest. Falces conical, armed 

 with fine teeth on the inner surface, and slightly inclined to- 

 wards the sternum, which is broad, somewhat convex, glossy, 

 and heart-shaped. Maxillae enlarged at the base, where the palpi 

 are inserted, and inclined towards the lip, which is semicircular. 

 The colour of the falces and maxillae is pale brown tinged with 

 red, and that of the sternum and lip dark brown. The four in- 

 termediate eyes describe a trapezoid whose anterior side is the 

 shortest, and those constituting each lateral pair are seated ob- 

 liquely on a small tubercle and are contiguous ; the anterior eyes 

 of the trapezoid are the smallest of the eight. The palpi have a 

 yellowish brown hue ; the cubital and radial joints are short, and 

 the latter projects two apophyses from its extremity ; the larger 

 one cui-ves outward in front of the digital joint, and the smaller 

 one, which is acute, is situated underneath ; the digital joint is 

 oval, convex and hairy externally, concave within, comprising 

 the palpal organs ; these organs are highly developed, prominent, 

 complicated in structure, with a black, filiform spine at their ex- 

 tremity, on the outer side, which is enveloped in delicate mem- 

 brane and curved in a circular form ; their colour is reddish 

 brown. The abdomen is oviform, black, thinly clothed with 

 hairs, convex above, projecting a little over the base of the 

 cephalo-thorax ; and the branchial opercula have a yellowish 

 brown hue. 



An adult male of this species was found running on a gravel 

 walk at Oakland in July 1863. 



Genus Walckena'era, Blackw. 

 Walckena'era exilis. 



Length of the male g'oth of an inch ; length of the cephalo- 

 thorax 2V '> breadth ^L ; breadth of the abdomen -^-^ ; length of 

 an anterior leg -^^ ; length of a leg of the third pair g'^. 



Cephalo-thorax oval, convex, glossy, elevated before, depressed 

 behind, with a narrow indentation directed backwards from each 



