330 ARANEIDEA. 
1. Pirata felix. (Tab. XXXL. fig. 23, ?.) 
Pirata feliz, O. P.-Cambridge, Biol. Centr.-Amer., Arachn. Aran. i. p. 248, t. 33. figg. 6, 6 a-d ( 9)’. 
Type, 2, in coll. Godman & Salvin, Total length 3°5 millim. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith 1); GUATEMALA (Sarg). 
ARCTOSA. 
Arctosa, C. L. Koch, Die Arachn. xiv. p. 123 (1848). 
Type A. cinerea (Fabricius). Europe. 
The spiders here included under Arctosa are congeneric with Aranea cinerea, Fabr. 
These, too, are species which are found close to the water-side, amongst the rocks and 
boulders of partially dried river-beds. 
They may be distinguished from the other genera here referred to (except Sosippus) 
by the absence of the stout spine at the base of tibiz iii. and iv. 
The species known to me may be recognized as follows :-— 
' Males. 
i. Sternum yellow-brown. Carapace equal in length to or shorter than protarsus iv. 
Characteristic lamina of palpal bulb much more slender and forming three 
branches. 
a. Size larger: length 14 millim. Legs more densely clothed with sie sine 
hairs . .. . . oe trifida, sp. n. 
b. Size smaller: length - millim. Legs less “densely clothed with water- --proof 
hairs . . . « . . . . soe » « « minutia, sp. 0. 
. Sternum suffused with black, Carapace equal i in length to the ssrotakans and 
half of tarsus iv. Characteristic lamina of palpal bulb much stouter, with a 
conspicuous, oblique, transverse carina terminating on the inner side ina blunt 
hook-like point. 2. 6 6. 6 8 6 ee ee ew ew ee we. Cinerea, Fabr. 
Females. 
i. Vulva with a decided J-shaped central process, with the lateral cavities much 
smaller. 
a. Size larger: length 15 millim. Stem of the central ]-shaped process of 
vulva longer and narrower in proportion to the cross-piece . . . . trifida. 
b. Size smaller: length 7 millim. Stem of the central |-shaped process of 
vulva shorter and broader in proportion to the cross-piece. . . minuta 
ii. Vulva without a decided [.-shaped central process, but with two broad lateral 
cavities obliquely directed forward, separated by a very narrow septum . . cinerea. 
Norr.—Trochosa mexicana and 7. parva, Banks, are unknown to me, and cannot be included in the Table 
They are left for the present under Arctosa. 7 
1. Arctosa trifida, sp.n. (Tab. XXXI. figg. 24, ¢; 25, 25a, 9.) 
Type d, gynetype Q, in coll. Godman & Salvin. Total length, ¢ 14, 2 15 millim, 
Colour and pattern similar in both sexes. Carapace and legs olive-brown, mottled and annulated with grey 
