626 
13. 
Mr. BIAckwalles Descriptions of new Species of Spiders. 
Family THERIDIIDÆ. 
Genus THERIDION, Walck. 
Theridion fuscum. Saturatè rufescenti-brunneum, abdomine maculis ob- 
scuris saturatioribus ; oculis in seriebus 2 transversis, intermediis trape- 
zoidem anticé multo breviorem referentibus, seriei posterioris omnium 
maximis, anterioris minimis ; pedibus robustis, pari Imo longissimo, dein 
4to, 3tio brevissimo; labio semicirculari. 
Length of the female 44th of an inch; length of the cephalo-thorax 35; 
breadth 4; ; breadth of abdomen 3; ; length of an anterior leg 7g; length 
of a leg of the third pair ,. 
'This spider is of a dark reddish brown colour, the abdomen being marked 
with obscure spots of a deeper shade. Cephalo-thorax glossy, compressed 
before, very convex immediately behind the eyes, depressed in the poste- 
rior region, with a large indentation in the medial line, and furrows on . 
the sides. Eyes disposed on the fore-part of the cephalo-thorax in two 
transverse rows; the intermediate ones form a trapezoid whose anterior 
side is much the shortest, and those of each lateral pair are contiguous 
and placed obliquely; the posterior eyes of the trapezoid are the largest, 
and the anterior ones much the smallest of the eight. Mandibles small, 
conical, armed with a few teeth on the inner surface, and inclined towards 
the sternum, which is broad and heart-shaped. Maxillæ obliquely trun- 
cated at the extremity on the outer side, and inclined towards the lip, 
which is semicircular. Legs robust; first pair the longest, then the 
fourth, third pair the shortest. Tarsi terminated by three claws; the 
two superior ones are curved and pectinated, and the inferior one is 
inflected near its base. The palpi have a slender, curved claw at their 
extremity. Abdomen subglobose, somewhat depressed, thinly covered. 
with hairs, glossy, projecting greatly over the base of the cephalo- 
thorax. 
Females of this species were captured in November and December 1837, on 
rails and under stones in pastures near Llanrwst. 
