202 
TIIERIDIIDiE. 
M. Koch was immature, the measurement of an adult female, discovered under a stone in a 
wood at Oakland, on the 14th of August, 1855, is subjoined. Length, : | d ths of an inch; 
length of the cephalo-thorax, T ' B th, breadth, ^th; breadth of the abdomen, T ' 5 th; length of a 
posterior leg, T 3 5 ths ; length of a leg of the third pair, # 6 ths. The length of M. Koch’s specimen 
was only one line. 
Theridion angulatum. PL XIV, fig. 133. 
Theridion angulatum,, Blackw., Lond. and Edinb. Phil. Mag., third series, vol. viii, 
p. 483. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. viii, 
p. 445. 
Length of the female, jth of an inch; length of the cephalo-thorax, A-th, breadth, And; 
breadth of the abdomen, Ath; length of an anterior leg, 1th; length of a leg of the third 
pair, 1th. 
The abdomen, which is deeply notched in front, and projects over the base of the 
cephalo-thorax, has an angular appearance, occasioned by two bold, lateral prominences, 
situated on its upper part, nearer to the posterior than to the anterior extremity; the space 
before the lateral prominences is of a deep, red-brown colour, the margins being the darkest, 
and on each side of the medial line there are two minute, yellowish-white spots, forming a 
long, narrow, quadrilateral figure; the posterior part has a pale, red-brown tint, and a trans¬ 
verse, yellow line connects the lateral prominences, from which two obscure, angular bands 
converge to the spinners; the whole of the upper part has an irregular border of yellowish- 
white, minutely freckled with red-brown; the sides and under part arc of a dark, red-brown 
colour, with streaks and small spots of a lighter shade; and the branchial opercula have a 
yellow tint. The cephalo-thorax is convex, slightly hairy, compressed and prominent before, 
rounded on the sides, and has an indentation in the medial line; its colour is pale, yellowish- 
brown ; on each side there is a longitudinal, red-brown band, another of the same hue 
extends along the middle, and the margins have a yellowish-white tint. The eyes are seated 
on black spots ; the four intermediate ones nearly form a square, the two anterior ones being 
placed on a protuberance; those constituting each lateral pair are seated obliquely on a 
tubercle, and are almost contiguous. The falces are moderately strong, conical, vertical, and 
of a red-brown colour, with a spot of a darker hue near the base, in front. The maxillae are 
enlarged where the palpi are inserted, obliquely truncated at the extremity, on the outer side, 
and inclined towards the lip, which is nearly semicircular, being soinewdiat pointed at the 
apex. These organs, with the palpi, which are short, and have a pectinated, curved claw at 
their extremity, are of a red-brown hue. The sternum, which is oblong heart-shaped, has a 
dark, red-brown tint. The legs are of a yellowish-brown colour, with red-brown annuli; the 
first pair is the longest, then the fourth, and the third pair is the shortest; the legs of the 
second and third pairs are shorter, as compared with those of the first and fourth pairs, than 
