OF PIIILADELPniA. 17 



lated, a rounded tubercle on each of the middle above ; feet paler 

 than the body, yellowish, with scattered hairs. 



Less than one-twentieth of an inch. 



Under bark of trees, &c. Georgia and P]ast Florida. [71 ] 



Genus GAMASUS Latr. 



Mouth with mandibles; palpi prominent, very distinct, fili- 

 form ; pulvilli at the apex of the tarsi. 



1. G. antenNjBPES. — Body ovate, rufous, somewhat nar- 

 rowed before, hairy and coriaceous; edge of the abdomen 

 membranaceous, white ; feet, anterior pair filiform, antcniiaeforra, 

 longer than the body, remaining pairs much more robust, sub- 

 equal, posterior thighs tridentate near the inferior tip j origin of 

 of the palpi with five or six acute spines above. 



Cabinet of the Academy. 



I have frequently observed this species, inhabiting, in con- 

 siderable numbers, the body of Paifsalus comuhis. The fore feet 

 are, as their slender appearance indicates, used as antenna; to feel 

 the way, and not as feet to support the body. 



2. G. SPINIPES. — Body suboval, hirsute, rufous; feot with 

 rather longer distant hairs, second pair very robust, third joint 

 armed beneath with a large, prominent, acute, spine, which is 

 nearly as long as the transverse diameter of the joint, compressed, 

 slightly serrated on its anterior edge, and with an accessory 

 tooth or two at its base : fourth joint with an obtuse tooth be- 

 neath, sixth joint with a robust spine before its inferior middle, 

 first and third pairs unarmed, fourth pair dentate beneath the 

 third and fourth joints. 



Cabinet of the Academy. 



Inhabits . [72] 



Remarkable by the prominent spine of the sccoml pair of feet. 



3. G. MUSCULUS. — Body pale, oval, with scattoied hairs more 

 numerous each side; feot paler, with a few hairs above, two an- 

 terior pairs distant from the others, anterior pair longest, second 

 pair rather more robust. 



An active little animal, found in great numbers on an anony- 

 mous species of Mks, which inhabits East Florida. 



5. G. NIDULARIUS. — Body oblong-oval, somewhat depressed, 

 with a slightly elevated margin, and with scattered hairs, whitish 

 1821.] 2 



