WALCKENAERA. 
289 
Monmouthshire, in the summer of 1853, and was forwarded to Oakland by Mr. R. H. Meade. 
This species, which has much resemblance to the Theridia in external structure, is placed 
provisionally in the genus Neriene till the female shall be discovered, as the sexes of the 
same spider frequently differ in the relative length of the legs and in the form of the maxillae. 
Genus — Walckenaera, Blackw. 
Eyes distributed on the anterior part of the cephalo-thorax, which sometimes in the 
females, and usually in the males, is remarkably elevated; the four intermediate eyes describe 
either a trapezoid whose shortest side is before or a small square, and those of each lateral 
pair are contiguous, or nearly so. 
Maxilla strong, dilated at the base, where the palpi are inserted, and curved or inclined 
towards the lip. 
Lip semicircular and prominent at the apex. 
Legs moderately long and robust; the anterior and posterior pairs, which are the 
longest, are equal in length, or nearly so, and the third pair is the shortest. 
Walckenaera acuminata. PI. XX, fig. 203. 
Walckenaera acuminata, Blackw., Lond. and Edinb. Phil. Mag., third series, vol. iii, 
p. 106. 
_ — Blackw., Research, in Zool., p. 315, pi. 2, figs. 3 6. 
_ __ Blackw., Annals and Mag. of Nat. Hist., second series, vol. 
ix, p. 272. 
Micryphantes camelinus, Koch, Die Arachn., Band iii, p. 11, tab. 76, figs. 168, 169. 
Length of the female, ®ths of an inch; length of the cephalo-thorax, Ab, breadth, -Ah , 
breadth of the abdomen, Ah ; length of an anterior leg, 3 th; length of a leg of the third 
pair, ith. 
The cephalo-thorax is oval, very convex, with a minute indentation in the medial line, 
and an acute, conical prominence in front; the falces are moderately strong, vertical, convex 
in front, and armed with teeth on the inner surface; and the sternum is oblong, heart- 
shaped. These parts, with the maxillae and lip, are glossy, and of a dark, brownish-black 
colour. The legs are hairy, but destitute of spines ; each tarsus is terminated by three 
claws ; the two superior ones are curved and pectinated, and the inferior one is inflected neai 
its base; the palpi are robust and without claws ; the cubital joint is remarkably short, and 
the radial and digital joints are somewhat dilated. These organs have a bright-rufous tint. 
The abdomen is oviform, convex above, projecting a little over the base of the cephalo- 
