Mr. Blackwall on undescribed Species of Araneide. 483 
eyes. Its palpi also differ a little in organizaticn : the third joint is clavate ; 
the fourth is short, terminating in three apophyses, the largest of which 
curves outwards before the fifth joint; exterior to this occurs the next in 
size, having a small, pointed prominence at its base, in front; and the 
smallest is situated underneath: the fifth joint is somewhat oval, convex 
and hairy externally, concave within, comprising the palpal organs; they 
are highly developed, complicated in structure, with a strong spine on the 
outer side curved into a circular form, and are of a brownish black colour 
tinged with red. 
Length, from the anterior part of the cephalothorax to the extremity of 
the abdomen, +th of an inch; length of the cephalothorax +, ; breadth 
z'y; breadth of the abdomen +',; length of an anterior leg #,; length of 
a leg of the third pair 2. 
I found males of this species under stones at Oakland in February 1835, 
but I have not been so fortunate as to discover the female. 
Tribe, INEQUITEL”, Latreille. 
Genus, Theridion, Walckenaer. 
Theridion angulatum. 
Cephalothorax inversely heart-shaped, inclining to oval, convex, slightly 
hairy, prominent before, where the eyes are situated, with an inden- 
tation in the medial line of the postericr region ; its colour is pale yellow- 
brown, with a longitudinal band ef red-brown on each side, and a broader 
one of the same hue extending along the middle ; the margins are yellowish 
white. Eyes placed on black spots; four, which are intermediate, form 
a square nearly, the two in front being seated on a protuberance ; the 
other four are disposed in pairs on the sides of the square; the eyes con- 
stituting each pair are placed obliquely on an eminence, and are near 
together but not contiguous. Mandibles moderately strong, conical, and 
perpendicular; they are red-brown, with a spot of a darker hue in front, 
near the base of each. Maxillze enlarged externally, where the palpi are 
inserted, obliquely truncated on the outer side, at the extremity, and in- 
clined towards the lip, which is almost semicircular, being a little pointed 
at the apex. These organs, and the palpi, which are short, and are armed 
with a curved, pectinated claw at the extremity, are of a red-brown colour. 
Pectus of an oblong heart-shape and a dark red-brown hue. Legs yel- 
lowish-brown banded with red-brown; the first pair is the longest, then 
the fourth, the third pair being the shortest; the second and third pairs 
are disproportionally short. Each tarsus is terminated by three claws; 
the two superior ones are curved, and are slightly pectinated near the base, 
and the inferior one is inflected near its insertion. The abdomen, which 
is deeply notched in front, and projects over the base of the cephalotho- 
rax, has an angular appearance, occasioned by two, bold, lateral promi- 
nences, situated on the upper side, nearer to the posterior than the an- 
terior extremity; the superior surface, from the fore part to the lateral 
prominences, is of a deep red-brown colour, the margins being the darkest ; 
on each side of the medial line are two minute, yellowish white spots, 
forming a long narrow quadrangle; the posterior part is pale red-brown, 
a yellow transverse line connecting the two lateral prominences, from 
which proceed two obscure, angular bands that 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 of the abdo- 
men are dark red-brown, with streaks and minute spots of a lighter shade. 
Plates of the spiracles yellow. 
Length, from the anterior part of the cephalothorax to the extremity of 
3C2 
