180 ARACHN1DES. 



their legs are elevated when at rest; sometimes the two first and two 

 last are the longest, and at others those of the two anterior pairs, 

 or the fourth and the third. The general arrangement of the eyes 

 does not form the segment of a circle or a crescent. 



They may be divided into three sections: the first, or that of the 

 Tubitelas, has cylindrical fusi approximated into a fasciculus di- 

 rected backwards; the legs are robust, the two first or the two last, 

 and vice versa, longest in some, and the whole eight nearly equal 

 in others. 



We will commence with two subgenera, which, with respect to 

 the jaws that describe a circle round the ligula, approach the 

 Filistatae, and are removed from those that follow. 



Clotho, Walck. Uroctea, Dufour. 



A singular subgenus. The chelicerae are very small, can sepa- 

 rate but little thereby approximating this subgenus to the last 

 and are not indented; very small hooks; the shortness of the body 

 and length of the legs produce a resemblance to the Crab-Spiders or 

 Thomisi. The relative length of these organs differs but little; the 

 fourth pair, and then the preceding one are merely somewhat longer 

 than the first; the tarsi, only, are furnished with spines. The eyes 

 are further from the anterior margin of the thorax than in the fol- 

 lowing subgenus, and are approximated and arranged as in the 

 genus Mygale of Walckenaer; three on each side form a reversed 

 triangle; the two others form a transverse line in the space comprised 

 between the two triangles. The jaws and the ligula are proportiona- 

 bly smaller than those of the same subgenus; a short projection or 

 slight dilatation on the external side of the jaws, gives insertion to 

 the palpi; the jaws terminate in a pebnt; the ligula is triangular and 

 not nearly oval as in Drassus. The two superior or most lateral 

 fusi are long, but what, according to Dufour, particularly charac- 

 terizes his Urocteae or our Clothos, is, that there are two pecti- 

 niform valves which open and shut at the will of the animal(l), in 

 place of the two intermediate fusi. 



But a single species is known, the Uroctea 5-maculata^ Du- 

 four, Ann. des Sc. Phys., V, lxxvi, 1; Clotho Durandii, Lat. 



(1) I have seen, in a well preserved specimen, six fusi, of which the two 

 superior were much the longest and terminated by an elongated joint, forming an 

 elliptical lamina, and the other four small, the inferior ones particularly, and ar- 

 ranged in a square. The anus, placed under a little membranous projection 

 resembling a clypeus, was furnished on each side with a pencil of retractile hairs. 

 These pencils are the parts named by Dufour pectiniform valves, and are distinct 

 from the two intermediate fusi, which are concealed by the two inferior ones. 



