UNITED STATES. 7# 



genus 0R1B1TA. Lat. 



Body coriaceous, capitate or rostrated before, palpi 

 and mandibles concealed within the mouth ; feet ter- 

 minated generally by three nails, w ithout pulvillus. 



Species. — t. 0. *concent<ica. Black, opake; ter- 

 gum concentrically lineated ; venter plaiu. 



Inhabits Pennsylvania. 



Cabinet of the Academy. 



Body spheroidal, black, opake, rounded before 

 and carinated behind, invested with a brown epi- 

 dermis; disk with about four elevated concentric cir- 

 cles, connected by numerous interstitial elevated 

 lines ; posterior carina crenate in compliance with 

 the concentric lines ; head subtriangular, rugose ; 

 oral aperture oval, closed by a valvular mentum 5 

 eyes two, minute, brownish, elevated on an elongated, 

 slender filiform peduncle ; orbits elevated, . rather 

 large, placed near the base of the head above ; feet 

 rather short, deep black, minutely granulated, ter- 

 minated by three incurved nails ; venter plain, gra- 

 nulated, valves of the cloaca somewhat lineated. 



" A rather common insect, it moves very slowly, and 

 inhabits beneath the bark of trees. I have found it, 

 most frequently, beneath the bark of the common 

 Carya (Nuttall) tomentosa. 



2- O. *glabraia. Body glabrous, polished, globu- 

 lar-oval black. 



Inhabits Georgia and East Florida. 



id 



