APOLLOPHANES.—MERMESSUS. 291 
from end to end, mottled with yellow-brownish and whitish, with a clear central longitudinal lanceolate 
marking at its fore end, followed by a black spot and a darker brown line to the spinners ; on each side 
of the broad band is a narrower well-defined black-brown band or stripe; the sides are longitudinally 
marked with broken black-brown and white strie. The underside is white, with a longitudinal central 
stripe of more or less amalgamated black dots. 
Hab. Mexico, Amula in Guerrero (//. H. Smith). 
PHILODROMUS, Walckenaer. 
Philodromus decolor, sp. n. 
Adult female, length rather less than 14 lines (3 millim.). 
The general form of this small species is normal. The cephalothorax is of a whitish-yellow colour, clothed 
with pale hairs, and with a broadish well-defined deep blackish marginal border, and two longitudinal 
stripes (formed by deep brown specks) on each side of the median line near the upper part of the thorax, 
continued forwards along the oblique junctional line of the caput to beneath the lateral eyes; the clypeus, 
whose height is half that of the facial space, is also speckled with black, and there are a few specks of 
the same on the hinder part of the caput, likewise between the hind-central pair of eyes are two opposed, 
short, curved, yellow-brown, longitudinal lines. 
Eyes small, subequal, seated on whitish tubercles; posterior row much less curved than the anterior row ; the 
interval between those of the hind-central pair is double or rather more than that between each and 
the hind-lateral on its side. The central quadrangle is much wider than long, but its anterior side is 
much shorter than the posterior side, and the fore-centrals are further from each other than from the 
fore-laterals. 
Legs moderately long, rather slender, 2, 1, 4, 3, not greatly different in length, furnished with hairs and 
spines. Colour pale yellow, the femora marked with two well-defined, black, longitudinal, narrow stripes. 
Falces pale yellowish, speckled with black, and furnished in front with coarse bristly hairs. 
Palpi moderately long, yellowish, furnished with hairs and a few spines. 
Maxille and labiwm normal ; colour pale yellowish. 
Sternum rather elongate heart-shaped, its posterior extremity a little, and obtusely, drawn out. It is whitish 
in colour, covered with coarse pale bristly hairs. 
Abdomen oval, whitish above, minutely and thinly marked with black specks, and covered with pale and 
yellowish hairs; an obscure, longitudinal, central, narrow, lanceolate, brown marking occupies the 
fore part of the upperside, and on each side of the middle of this marking is a small black dot; on each 
side of this, and converging to near the spinners, is an irregular obscure brown stripe; the sides are 
yellow-brown, with an obscure yellowish oblique patch ; the underside is whitish. The genital aperture 
is small but of a characteristic form. Spinners short, compact, dull yellowish, suffused with blackish on 
the outer sides. ; 
Hab. Costa Rica (Sarg). 
MERMESSUS*, gen. nov. (fam. Theridiide ; subfam. Erigonine). 
Cephalothorax broad-oval ; broadly truncate before, with the fore-corners well rounded ; caput moderately 
and gradually raised ; ocular area broad and a little prominent; clypeus impressed close to the ocular 
area, and a little prominent at the lower margin, its height about, or nearly, half that of the facial space. 
Eyes rather large, subequal, the fore-centrals smallest, the rest scarcely different in size from each other, the 
fore-laterals perhaps slightly largest. The posterior row is straight or very slightly curved, the convexity 
directed backwards ; the anterior row not greatly shorter than the posterior, and the convexity of its 
much stronger curve directed forwards. The hind-centrals are distinctly but not greatly nearer to each 
* Nom. propr. 
2 Pf 2 
