202 ARACHNIDES. 



FAMILY II. 



PEDIPALPI. 



In the second family of the ArachnidesPiilmonarisB, we find 

 very large palpi, resembling projecting arms, terminated by a 

 forceps or a claw ; didactyle chelicerse, one finger of which 

 is movable ; an abdomen composed of very distinct segments, 

 without fusi at the extremity ; and the sexual organs placed 

 at the base of the abdomen. The whole body is invested with 

 a firm tegument ; the thorax consists of a single piece, and 

 exhibits three or two simple eyes, approximated or grouped, 

 near the anterior angles ; and near the middle of its anterior 

 extremity, or posteriorly, but in the median line, two others 

 equally simple and approximated. There are four or eight 

 pulmonary sacs. Those which form the genus 



Tarantula, Fab., 



Have their abdomen attached to their thorax by a pedicle, or por- 

 tion of their transverse diameter; it has no pectinated laminae at its 

 base, nor sting at its extremity. Their stigmata, four in number, 

 are situated near the origin of the venter, and are covered with a 

 plate. Their chelicerae (mandibles) are simply terminated by a 

 movable hook. Their ligula is elongated, very narrow^, and con- 

 cealed. They have but two jaws, which are formed by the first 

 joint of their palpi. 



They all have eight eyes, of which three, on each side and near the 

 anterior angles, form a triangle; and two near the middle at the 

 anterior margin are placed on a common tubercle or little elevation, 

 one on each side. The palpi are spinous. The tarsi of the two 

 anterior legs differ from the others, being formed of numerous seta- 

 ceous or filiform joints, and without a terlTiinal nail. 



They are confined to the hottest portions of Asia and America. 

 Their habits are unknown to us. They now constitute two subge- 

 nera. 



Phkynus, Oliv. 



Palpi terminating in a claw; the body much flattened; thorax 

 broad, and almost in the form of a crescent; abdomen ecaudate, and 



