Mr. Blackwall on undescribed Species of Araneide. 485 
legs have induced me to class it with the Theridia. It occurs under stones 
in the woods at Oakland, where I captured specimens in March 1835. 
The first individual I examined under the microscope was a female, and 
it presented an anomaly in organization which I never before witnessed 
in this class of animals ; it had a supernumerary eye, situated between the 
two small ones constituting the anterior pair of the trapezoid. An in- 
stance of a deficiency of eyes in a female Thomisus cristatus has since 
fallen under my observation. This spider had the two lateral pairs only ; 
the two intermediate, or smaller pairs, were altogether wanting, not even 
the slightest rudiments being visible. 
Genus, Neriene, oT 
‘ : mihi. 
Neriene rubripes, 
Cephalothorax oval, convex, glossy, with furrows on the sides diverging 
from the upper part to the margins, and an indentation in the medial line 
of the posterior region. Mandibles powerful, conical, convex in front, 
divergent at the lower extremities, armed with two rows of teeth on the 
inner surface, and slightly inclined towards the pectus, which is heart- 
shaped. Maxilla strong, and inclined towards the lip, which is semicir- 
cular and prominent at the apex. These parts are of a red-brown colour, 
the mandibles, lip, and margins of the pectus being the darkest. Legs mo- 
derately robust, provided with hairs and a few fine spines; the first pair is 
rather the longest, then the fourth, the third pair being the shortest. 
These organs and the palpi are of a red colour. Each tarsus has three 
claws at its extremity; the two superior ones are pectinated about two 
thirds of their length from the base, and the inferior one is inflected near 
its insertion, Eyes placed on black spots, and disposed as in the Neriene 
generally. Abdomen oval, convex above, projecting over the base of the 
cephalothorax ; it is thinly covered with hair, glossy, and brownish black. 
Plates of the spiracles pale yellow. A curved process of a red-brown 
colour is connected with the sexual organs. Some individuals have the 
abdomen of a yellowish-brown hue, and the other parts, generally, lighter- 
coloured. 
Length, from the anterior part of the cephalothorax to the extremity of 
the abdomen, .%,ths of an inch; length of the cephalothorax ~, ; breadth 
a's breadth of the abdomen ;',; length of an anterior leg +; length of 
aleg of the third pair ~,. 
The male is somewhat smaller and darker-coloured than the female, 
but its legs are longer, an anterior one measuring ~%ths of an inch. The 
maxille are remarkably convex externally immediately before the insertion 
of the palpi. The second joint of the palpi is curved towards the cepha- 
lothorax; the third and fourth joints are short, the latter being rather the 
larger: the fifth is oval, convex and hairy externally, concave within, com- 
prising the palpal organs, which are prominent, highly developed, complex 
in structure, and are of a dark red-brown colour. ‘The fifth or terminal 
joints of the palpi have their convex sides directed towards each other. 
This species was found at Oakland, under stones, in the autumn of 1834, 
by Mr. T. Blackwall. 
Neriene tibialis. 
This spider has the cephalothorax of an oval form; it is convex, glossy, 
prominent but obtuse before, where the eyes are situated, with an indenta- 
tion in the medial line of the posterior region. Mandibles moderately 
owerful, conical, armed with teeth on the inner surface, and somewhat 
inclined towards the pectus, which is heart-shaped. ‘These parts, with 
