50 THE CANADIAN ENTOMOLOGIST. 



inferior claws without teeth ; the inferior claw dilated on the 

 inner margin; antennge not twice as long as the head. 

 Habitat — Nova Zembla, Northern Siberia, and 



Greenland '^bidendiculata, TuUb. 



Teeth of mucro distinct, prominent, two first slightly longer than the 

 second, both pointing caudad ; superior and inferior claws 

 without teeth ; inferior claw of inner margin roundly dilated at 

 middle ; furcula reaching the ventral tube ; dentes twice as long 

 as the manubrium ; body and antennpe blackish ; legs and 

 furcula white ; antennte a little longer than the head, the second 

 and third segments dilated at apex. Habitat — Salineville, 

 Ohio parva, n. sp. 



13. Mucro with three teeth 14. 



, Mucro with four teeth — the first short, hooked ; the second, lone, 



vertical, and about as long as the mucro is wide ; the third and 

 fourth subequal to the second, vertical and opposite ; superior 

 claw without teeth ; the inferior claw without teeth, but with 

 the inner margin broadly, roundly, dilated; furcula not attaining 

 the ventral tube ; the dentes and manubrium subequal in 

 length i body and antennse yellowish, mottled with gray ; legs 

 and furcula white ; antennte not longer than the head. 

 Habitat — Dover; Massachusetts (A. P. Morse) . . . .unica, n. sp. 



14. Superior claw with a tooth on the outer margin, inner margin with- 



out teeth ; inferior claw without teeth, and the inner margin 

 broadly, roundly, dilated ; mucro with three teeth, the first and 

 second of the same length, pointing in the same direction, and 

 in the same line, the third shorter, vertical ; furcula attaining 

 the ventral tube ; dentes twice the length of the manubrium 

 body and antennae brownish-black ; legs and furcula white 

 antenna? a little longer than the head. Habitat — Salem, 



Ohio conwitma, n. sp 



Superior claw without a tooth on the outer margin 15 



15. Second tooth of mucro shorter than either the first or third, the third 



as long or longer than the first, all pointing dorso-caudad ; 

 superior and inferior claws without teeth ; inferior claw some- 

 what dilated on the inner margin towards the base ; furcula 

 reaching the ventral tube ; dentes twice the length of the 



* Species not seen. 



