328 ARACHNIDES. 



We now pass to Araneides with but one pair of pulmonary sacs, and as 

 many stigroata. They all have palpi formed of five joints, inserted into 

 the external side of the jaws near their base, and most frequently in a sinus; 

 a ligula extending between them either nearly square, triangular or semi- 

 circular and six fusi at the extremity. 



With the exception of a few species, which enter into the genus Mygale, 

 they compose that of 



Aranea, Lin. 

 A first division will comprehend the ARANEiE Sedentahi^, or sedentary 

 spiders. They make webs, or throw out threads to ensnare their prey, 

 and always remain in these traps, or their vicinity, as well as near their eggs. 

 Their eyes are approximated antei'iorly and are sometimes eight in number, 

 of which four or two are in the middle and two or three on each side, and 

 sometimes six. 



Some, which, from the circumstance of their always moving forwards, we 

 term the Rectigradjb, weave webs and are stationary; their legs are eleva- 

 ted 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 Tubite- 

 \x, has cyhndrical fusi approximated into a fasciculus directed 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. 



Clotho, Walck. 



A singular subgenus. The chelicerae are very small, can separate but 

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

 length of the legs produce a resemblance to the Ci-ab-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 fui-nished with spines. The eyes are further from the anterior margin 

 of the thorax than in the following 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 com- 

 prised between the two triangles. The jaws and the ligula are proportion- 

 ably smaller than those of the same subgenus; a short projection or slight di- 

 latation on the external side of the jaws, gives insertion to the palpi; the jaws 

 terminate in a point; the ligula is triangular and not nearly oval as in Drassus. 

 The two superior or most lateral fusi are long, but what, according to Du- 

 four, particularly characterises the Clothos, is, that there are two pectini- 

 form valves which open and shut at the will of the animal, in place of the 

 two intermediate fusi. 



But u single species is known, the Clotho Durandit, Lat. M. Dufour 



