354 ARANEIDEA. 
The generic characters are given under those of the family and do not need repetition 
here. 
The species known to me may be recognized as follows :— 
Males. 
A. Size much larger. Tibia of palpus twice as long as broad. Central 
process of bulb slender, falciform, with a small barb on the inner 
WAPEIN yo, ee chin daeenirngitly ho ea 
B. Size much smaller. Tibia of palpus scarcely longer than broad. Central 
process of bulb not falciform, bibranchiate . . . . . «. . «. . ‘mistus, O. P.-Cambr. 
Jfuscus, E. Simon. 
Females. 
A. Size much larger. Vulval area much broader than long, with a broad, 
anterior, triangular, chitinous plate having a central semicircular 
concavity 2... ww ee ee ee ee ee ee ew. fuscus. 
B. Size much smaller. Vulval area slightly longer than broad, with, an- 
teriorly, a narrow, semicircular, chitinous margin enclosing a shallow 
concavity 2... 1 we ee ee ee ee ee ee we mists. 
1. Zorocrates fuscus. (Tab. XXXIII. figg. 8, 8a, ¢; 9, 9 a-d, 2.) 
Zorocrates fusca, E. Simon, Ann. Soc. Ent. Fr. 1888, p. 212°. 
Satricum gnaphosoides, O. P.-Cambr. Biol. Centr.-Amer., Arachn. Aran. i. p. 99, t. 18. figg. 4, 
4a-e(3),5,5a(2)?. 
Lycodrassus robustus, L. Koch, in litt.* 
Type of 2%. fusca 3, gynetype 2, in coll. E. Simon; that of S. gnaphosoides, ¢ & 2, in coll. Godman & 
Salvin ; that of LZ. robustus, 2, in Mus. Brit. Total length, ¢ 20, 9 24 millim. 
Hab. Mexico, Cordova (coll. Keyserling *), Amula, Omilteme, Chilpancingo, Chiapas 
(H. Ll, Smith); Guatemaua, Tactic (Sarg 2); Panama, Bugaba (Champion). 
2. Zorocrates mistus. (Tab. XXXIII. figg. 10, 10a, 3; 11, 2.) 
Zorocrates mistus, O. P.-Cambr. Biol. Centr.-Amer., Arachn. Aran. i. p. 176, t. 21. figg. 9, 
9a-g (3), 10, 10a(¢)*. 
Rubrius mordax, O. P.-Cambr. Joe. cit. p. 279, t. 87. figg. 1, 1 a-e (¢)*. 
Type of Z. mistus 3, gynetype 9, total length, ¢ 9, 2 10 millim.; that of R. mordax, 2, total length 
10 millim.: in coll, Godman & Salvin. 
Hab. Muxico, Omilteme in Guerrero (H. H. Smith} 2), 
Fam. ACANTHOCTENIDA. 
Tarsal claws two in number ; claw-tuft present. Calamistrum and cribellum present. Eyes in three rows, 
2,4, 2,as in the fam. Ctenide. Carapace compressed, abruptly precipitous posteriorly, often deeply 
impressed behind the cephalic region, hence often gibbous in the region of the central stria. Labium 
half the length of the maxille, Mavxille long, straight, emarginate on the outer side, dilate and obliquely 
