1818.] OF THE UNITED STATES. 383 



edge or palm, the nail or thumb curved, acute, and at- 

 taining the third tooth; eighth, ninth and tenth segments 

 of ihe body serrated, the last more conspicuously so. 



Length two fifths of an inch. 



Remarkable by its large eyes, short, stout antennae, 

 and serrated appearance of the hind part of the back, oc- 

 casioned by the elevation of the tip of each of those seg- 

 ments above the base of the succeeding one. 



2. A. dentata*. Posterior edge of the dilated thighs 

 strongly serrated; eyes distant above; clypeus obtuse. 



Inhabits South Carolina. 



Cabinet of the Academy. 



Antennae moderate, not remarkably robust; clypeus 

 not projecting beyond the frontal curve; eyes small, sub- 

 triangular, distant above; hand trimcate at tip, destitute 

 of prominent teeth, but furnished with a few rigid hairs, 

 nail closing on the tip and not on the inferior edge; feet, 

 posterior edge of the dilated thighs conspicuously serrat- 

 ed with from eight to twelve teeth; terminal segments of 

 the body not remarkably serrated. 



Length nearly three tenths of an inch. 



A very common inhabitant of the fresh water marshes 

 of South Carolina. 



3. A. punctata^. Antennae elongated, inferiores long- 

 er; hands oval, not dentated; body with numerous black 

 points. 



Inhabits Great Egg- harbour. 



Cabinet of the Academy. 



Eyes ovate, acute and distant above; clypeus not pro- 

 jectiu'^ into an angle; antennce elongated, superiores two 

 thirds as long as the inferiores, inferiores nearly equal to 



