252 ARANEIDEA. 
usually with a single spine beneath, and iii. with four, iv. with three, apical spines beneath. Sternum 
elongate-oval, narrowed between the anterior cox, but not dilated behind. 
Vulva with a deep, short, semicircular notch in the centre of the posterior margin, with two chitinous grooves 
situated about their own length from the posterior margin, a little over their own length apart, slightly 
convergent posteriorly, both being embraced in a broad, transverse oval, brown area. 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
This species differs from the typical Marpissa muscosa in the absence of the lateral 
inner spine on tibia i. and the non-dilated sternum. 
METACYRBA, gen. nov. 
Type Metacyrba teniola (Hentz). North America. 
©. Leg i. much incrassate ; femur i. much compressed, without spines, or with only a very minute one besides 
the two long dorsal spines; tibia i. without any spines, or at most with three on the outer side only; 
protarsus i. with 2—2 spines beneath; tibie iii. and iv. with 1 or 1—1 spines beneath; patelle of all 
four pairs without spines. Sternum much attenuate in front between the anterior coxe, dilate behind. 
Cephalic quadrangle much broader than long; carapace rugulose, without any decided central depression 
behind the posterior eyes. 
1. Metacyrba teniola. (Tab. XXII. figg. 9, ¢; 10, 10a, 5, 2.) 
Atius teniola, Hentz, Journ. Bost. Soc. Nat. Hist. v. p. 353 (1845)’; Spid. U.S. ed. by Burgess, 
p- 56, t. 8. fig. 5”. 
Cyrba teniola, Peckh. Trans. Wisc. Acad. Sci. vii. p. 75, t. 5. figg. 56,565 (4), t. 6. fig. 56a(?)*. 
Total length, g 4 millim. (sec. Peckham), ? 9 millim. (Mexican examples). 
This fine species may be recognized at once by its black carapace and abdomen, the latter with a pair of thin 
white dorsal longitudinal lines, sometimes more or less interrupted, enclosing a paler brown band, extending 
from the anterior margin tothe spinners. Legs i. and ii. mahogany-black ; protarsus and tarsus i. orange ; 
tibia, protarsus, and tarsus ii. dull orange; patella, tibia, and tarsi iii. and iv. orange, the vent black- 
brown. Sternum, coxe of legs, and ventral area dark mahogany-black. The vulva presents a conspicuous 
wedge-shaped groove, its apex directed backward, with a central convex wedge-shaped piece. 
Hab. Nortu America! ? 3.—Mexico, Amula in Guerrero (H. H. Smith). 
I cannot find that this species is congeneric with Simon’s type of Cyrba, and therefore 
a new genus is required for it. One may not, however, have correctly identified 
Peckham’s C. teniola (Hentz). 
PARAMARPISSA, gen. nov. 
Type Paramarpissa tibialis, sp.n. Mexico. 
Similar in general characters to Marpissa, but with only one or two, or sometimes without any, spines beneath 
tibia i. Carapace very distinctly narrower in front, thus differing from that of Marpissa and Metacyrba. 
1. Paramarpissa tibialis, sp.n. (Tab. XXII. figg. 11, 11 ad, ¢.) 
Type, d, in coll. Godman & Salvin. Total length 7 millim. 
Carapace black, with a broad central band of white hairs and a narrow white marginal band. Abdomen with 
