OP PHILADELPHIA. 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. Greorgia and East Florida. [ 71 ] 



Genus GAM ASUS Latr. 



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

 form ; pulvilli at the apex of the tarsi. 



1. G. ANTENN^PES. — Body ovate, rufous, somewhat nar- 

 rowed before, hairy and coriaceous; edge of the abdomen 

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

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

 equal, posterior thighs tridentate near the inferior tip ; 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 Passalus cornufus. The fore feet 

 are, as their slender appearance indicates, used as antennae to feel 

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



2. G . SPINIPES. — Body suboval, hirsute, rufous ; feet 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 second pair of feet. 



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

 numerous each side ; feet 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 Mus, which inhabits East Florida. 



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

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

 1821.] 2 



