TEGENARIA. 339 
The two genera, of which representatives have been found in Central America, are 
scarcely separable, their habits and general appearance being also very similar. ‘They 
may, however, be roughly separated by the eye-formula. 
GENERA. 
A. Both rows of eyes only slightly procurved . . . . . . . . . . TrGenarta, Latr. 
B. Both rows of eyes strongly procurved. . . . . . . . . . « . AGELENOpsrIs, Giebel. 
TEGENARIA. 
Tegenaria, Latreille, Nouv. Dict. xxiv. p. 184, column 1, line 49 (1804). 
Type Tegenaria civilis (Walck.)= TZ. derhamti, Scop. Europe. 
The three species, one of which is well-known in the European and North-American 
fauna, may be recognized as follows :— 
Males. 
A. Abdomen dull white, with numerous obscure dusky spots. Tibia of palpus 
somewhat incrassate, with a short blunt spur at the outer apical angle. 
Palpal spine short, very stout, very strongly curved, its apex terminating 
on the anterior portion of the membranous sheath, itself short and incon- 
spicuous . 2 ee 1 ww ee ee ee we ew ww ew we) derhami, Scop. 
B. Abdomen rich brown, with a central anterior pale yellow band, becoming 
very slender and tridentate behind. Tibia of palpus not incrassate, with a 
short, but sharp, apical spur, its apex slightly curved. Palpal spine very 
long, slender, encircling the whole tarsus beneath, its apex resting on the 
posterior cusp of the long conspicuous membranous sheath. . . . . . flexuosa, sp. n. 
Females. 
A. Size much larger, 12 millim. Vulva consisting of a narrow, transverse, brown, 
chitinous piece, flanked on each side by a small sinuous cusp, on the poste- 
rior margin of the area . . oe woe ee ew we wee) erhami. 
B. Size much smaller, 6°5 millim. Vulva consisting of a transverse-oval cavity 
nearly filled by a transverse-oval plate (fide Banks) . . . . . . . . obscura, Banks. 
Norr.—Adult females of the first-mentioned species alone occur in our collection. 
1. Tegenaria derhami. (Tab. XXXI. figg. 32, ¢; 33, 2.) 
Aranea derhamii, Scopoli, Entom. Carn. p. 400 (1763)". 
Tegenaria derhami, Banks, Proc. Calif. Acad. Sci. (3) i. p. 280 (1898)*; Emerton, Trans. Conn. 
Acad. Sci. viii. p. 193, t. 7. figg. 6, 6a-c*, and ix. p. 411%. 
Hab. Nort America, Canada 4, New England 3, California 2.—Costa Rica (Rogers & 
Tristan).— EUROPE }. 
