DYSDERINA.—THERIDION. 143 
DYSDERINA, Simon. 
Dysderina plena, sp. n. 
Adult female, length 1} lines. 
Cephalothorax longer than broad, the portion behind the ocular area almost circular, gradually rising in a 
depressed subconical form to its highest point at the thoracic junction; no impression or indentation; 
however,.indicates this point, nor are any of the normal grooves or indentations visible. It is covered, 
most thickly on the sides and hinder part, with minute granulosities, and is of a bright yellow-brown 
colour, with a blackish marginal line. | 
Eyes 6, large, closely grouped together ; the posterior row straight, consisting of four eyes, contiguous to each 
other and scarcely differing in size; the hind-central pair are of a short oblong-oval form. Each of the 
anterior pair is almost contiguous to the hind-lateral and hind-central eye on its side. The interval 
between the anterior pair of eyes (which are distinctly the largest of the six) is less than half a diameter. 
The height of the clypeus is less than the diameter of one of the anterior eyes, which form a shorter 
row than the four posterior eyes. 
Legs moderate in length and strength. The femora strongest, increasing gradually above from the anterior to 
the posterior extremity, those of the first and second pairs strongest. Spines on these latter only—five 
pairs (long and strong) beneath the tibie, and three pairs beneath the metatarsi, in two parallel rows; 
also beneath the femora of the first and second pairs is a row of three spines on the outer side and two 
on the inner side. The colour of the legs is dull orange-yellow. 
Falces, maxille, labium, and sternum similar in colour to the cephalothorax. 
Abdomen of a pale luteous colour, connected with the cephalothorax by a short sheathed rugose pedicle. The 
anterior two-thirds of the upperside of the abdomen covered with a coriaceous plate similar to the 
cephalothorax in colour and of a short broad-oval form; a similar plate underneath includes the 
pedicle, the spiracular openings, and the genital aperture, and reaches rather more than halfway from the 
genital aperture towards the spinners. The genital aperture is of a transverse-oval form. 
Hab. Mexico (H. H. Smith). 
THERIDION, Walckenaer. 
Theridion facetum, sp. n. 
‘Adult male, length scarcely 1 line. 
Cephalothorax as broad behind as long, and much broader behind than in front; lateral marginal impressions 
very slight. Colour yellow, the sides marked with darker suffused converging rays; a broad black- 
- brown central longitudinal band includes the ocular area and becomes narrower gradually to the posterior 
extremity. 
Eyes of moderate size, subequal. They are rather closely grouped; the ocular area occupies the whole width of 
the fore part of the caput, and is a little prominent. The four central eyes form a trapezoid if anything 
slightly longer than broad, and whose anterior side is longer than the posterior. The hinder row forms 
very nearly a straight line, if anything the very slight curve of it has its convexity directed forwards 
when looked at from above and behind. The interval between the hind-central pair is little, if any, more 
than half a diameter, while that which separates each from the hind lateral on its side is very nearly a 
diameter. The fore-centrals are much wider apart than each is from the fore-lateral eye on its side, the 
interval between each fore-central and the fore-lateral next to it being less than half a diameter, 
The laterals are contiguous on a slight tubercle, and appeared to be rather the largest of the eight. The 
fore-centrals are on a strongish prominence, and the clypeus, which is strongly impressed just below the 
fore-centrals, considerably exceeds half the facial space in height. 
Legs 1, 4, 2, 3, moderately long, slender, furnished with longish hairs only. They are of a yellowish hue 
suffused with deep brown, the lower part of the femora yellow, into which the brown hue gradually 
merges. a 
Palpi short, yellow, furnished with a few longish bristly hairs only. The humeral joint is somewhat tumid 
in form, and the cubital joint rather nodiform ; the radial joint is very short, and has its fore extremity 
