UNITE!) STATES. 7* 



genus GAMASUS. Latr. 



Mouth with mandibles 5 palpi prominent, very dis- 

 tinct, filiform ; pulvilli at the apex of the tarsi.. 



Species. 1. G. *antmnwpes. Body ovate, ru- 

 fous, somewhat narrowed before, hairy and coria- 

 ceous ; 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 the palpi with five or six acute spines above. 



Cabinet of the Academy. 



1 have frequently observed this species, inhabiting, 

 in considerable numbers, the body of Passalus cor- 

 nidus. The fore feet are, as their slender appear- 

 ance indicates, used as antennae to feel the w T ay, 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, pro- 

 minent, acute spine, which is nearly as long as the 

 transverse diameter of the joint, compressed, slightly 

 serrated on its anterior edge, and with an accessary 

 tooth or two at its base, fourth joint with an obtuse 

 tooth beneath, 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 , 



