Arachnida. 8593 



horizontal line- The eyes also of the side and hinder pairs differ in 

 their relative size and position from the corresponding ones in the 

 present species. 



Walckenaera altifrons. 



Male, adult. Length 1 -fifteenth of an inch. Length of cephalo- 



thorax 1-thirty-second. Relative length of legs, 4 — 1, 2, 3. 

 Cephalothorax blackish brown, tinged with greenish. Ocular region 

 much elevated; face of the elevation flattish, and nearly perpen- 

 dicular at the upper part. The hinder part is convex, and 

 arched into a kind of hood shape. On each side of the base of 

 the upper part of this elevation is a strong horizontal indenta- 

 tion : the lower part of the elevation forms a kind of second 

 segment, projecting slightly beyond the upper segment, and 

 divided from it by a transverse groove ; this lower segment 

 joins imperceptibly into the rest of the cephalothorax. The 

 face of the upper segment is thickly clothed with short bristly 

 palish-coloured hairs, directed forwards and downwards ; the 

 frontal margin below the lower eyes is rather prominent. 



Eyes in four pairs — one on the fore part of the summit of the upper 

 segment, wide apart and the largest of the eight : another pair 

 on the line of division from the lower segment ; these are near 

 together, but not contiguous : the eyes of the side pairs are 

 very nearly equal in size ; they are placed obliquely and are 

 contiguous ; they are also slightly below the line of the pair on 

 the lower segment. 



Legs moderate in length and strength, of a bright orange-yellow 

 colour, sparingly clothed with fine hairs. There is but little 

 difference in the length of the first, second and fourth pairs. 



Maxillae short, broad, convex, and much inclined towards the 

 labium, and of a greenish brown colour. 



Labium short, convex, semicircular, and of a black colour. 



Falces short, strong. Colour greenish brown. 



Sternum heart-shaped, very convex, and sparingly clothed with yel- 

 lowish hairs. 



Abdomen longer than the cephalothorax, very convex above. Co- 

 lour black. Sparingly clothed with hairs. 



Palpi moderately long, and of a yellowish colour. Cubital joint 

 slightly clavate, and about double the length of the radial joint, 

 which is stout, hairy, and produced in front into a projection, 

 VOL. XXI. 2 o 



