42 Mr. J. Blackwall on new species of 
of two very prominent glossy lobes with a small process between - 
them. Plates of the spiracles reddish brown. 3 
I dedicate this interesting spider to John Joseph Bennett, Esq., 
F.R.S., British Museum, in acknowledgment of the obligation 
I am under for his valuable classical assistance in characterizing 
undescribed species of Araneidea for publication. 
Genus Ercarts, Blackw. 
17. Ergatis annulipes. 
Length of the female 3th of an inch; length of the cephalo- 
thorax ;1,; breadth 24, ; breadth of the abdomen 74; length of 
an anterior leg +; length of a leg of the third pair 4. 
First pair of legs the longest, then the second, third pair the 
shortest ; these organs and the palpi are pale brown with darker 
brown annuli. The metatarsus of each posterior leg is provided 
with a calamistrum. Cephalo-thorax compressed before, with 
furrows on the sides diverging towards the margins, and a de- 
pression in the medial line of the posterior region: it is of a dark 
brown colour, and the anterior part, which is very convex, is 
provided with several longitudinal Imes of white hairs. The 
four intermediate eyes form a square ; the other four are disposed 
laterally in pairs, each pair being seated obliquely on a projection 
of the cephalo-thorax. Mandibles powerful, somewhat conical, 
vertical, and armed with a few minute teeth on the inner surface : 
maxille strong, convex underneath, at the base, with the extre- 
mities more abruptly curved on the inner than on the outer 
side, and inclined towards the lip, which is large and somewhat 
triangular: sternum heart-shaped, thinly covered with white 
hairs: these parts are dark brown, the sternum being the darkest. 
Abdomen oviform, thickly covered with short hairs, convex above, 
projecting over the base of the cephalo-thorax ; along the middle 
of the upper part a broad, dentated, brownish black band ex- 
tends, which is generally bisected, or nearly so, by an irregular, 
transverse, yellowish white lme, between which and the spinners 
is a series of obscure lines of the same hue, forming obtuse an- 
gles whose vertices are directed forwards; a deep border of yel- 
lowish white encompasses the brownish black band; the sides 
are brownish black mottled with yellowish white, and the under 
part is yellowish white, with a brown band in the medial line. 
Spinners eight, the inferior pair being united to the extremity. 
Plates of the spiracles brown. 
The male, though smaller than the female, resembles her in 
colour and in the relative length of its legs; but the mandibles, 
which are longer, and curved boldly forwards at the end, have a 
large prominence on the under side and a minute one in front, 
