PULMONARI^. 291 



Dysdera, Lat. 



But six eyes arranged in the figure of a horse-shoe, the opening in 

 front ; the chelicerse very stout and projecting ; jaws straight and 

 dilated at the insertion of the palpi *. 



FiLISTATA, Lat. 



Eight eyes grouped on a little eminence at the anterior extremity 

 of the thorax ; the chelicerae small ; the jaws arcuated on the outer 

 side, and surrounding the ligula f. 



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

 and as many stigmata. 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, ti'iangular or semicircular, and six fusi at the anus. The 

 last joint of the palpi, in the males, is more or less ovoid, and usually 

 encloses, in an excavation, a complicated and varied organ of copu- 

 lation : it is rarely — Segestria — exposed. 



"With the exception of a few species, Avhich enter into the genus 

 Mygale, they compose that of 



Aranea, Lin, Araneus, of some authors. 



A first division will comprehend the Arane^ Sedentari^, or seden- 

 tary 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 anteriorly 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 for- 

 Avards,we term the RectigradjE, weave webs and are stationary ;their 

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

 are tlie longest, and at others those of the Irwo 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 

 Tubitelae, has cylindrical 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. 



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

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

 tatse, and are removed from those that follow. 



Clotho, Walck. — Uroctea, Dufour. 



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

 but little — thereby approximating this subgenus to the last — and 



* Dysdera erythrina, Lat. ; Walck., Tab. des Aran., V, 49, 50 ; Dufour, Ann. 

 des Sc. Phys. V. Ixxiii, 7 ; Aranea rufipes, Fab. ; Dysdera parvula, Dufour, lb. 



f Filistata hicolor, Lat. ; Walck., Faun. Frang., Arach., VI, 1 — 3, A moder- 

 ate size species is founded at Guadaloupe, the male of which has long and slender 

 legs, curved palpi, with the genital organs situated at the extremity of the last joint, 

 aad terminated by a slender and arcuated, or falciform hook. 



u 2 



