THE CANADIAN ENTOMOLOGIST. 51 



manubrium ; body and antennte dilute purplish ; legs and furcula 

 white ; antennas a little longer than the head. This species is 

 paralleled in the European fauna by Isotoma sens ib His, Tullb. 



Habitat — Salineville, Ohio trispinata, n. sp. 



Second tooth of mucro as long as either the first or third i6. 



1 6. Inferior claw without a tooth on the inner margin 17. 



Inferior claw with a tooth on the inner margin, strongly dilated at 

 middle ; superior claw without teeth on the outer or inner 

 margins, the outer margin roundly interrupted at middle ; mucro 

 with three teeth, the first long, terminal, evenly curved, and of 

 the same length as the second, the second and third of the same 

 length, opposite, as long as the mucro is wide, and pointing in 

 the same direction as the first ; furcula long, reaching to near 

 the ventral tube \ dentes very slightly longer than the manu- 

 brium ; body yellowish ; furcula and legs white ; antennie 

 yellowish, apices of the segments purplish; apical segment semi- 

 circular. Habitat — Fredericksburg, Virginia (William D. Rich- 

 ardson tridentata, n. sp. 



17. Furcula reaching the ventral tube ; the dentes twice as long as the 



manubrium ; superior and inferior claws without teeth ; inferior 



^ claw with its inner margin roundly dilated towards the base ; 



mucro with three teeth, the first tooth distant from the second, 



making a prominent curve, and pointing dorso-caudad, the 



second and third vertical, subequal in length, if any difference 



the third the shortest ; body, legs, antennae, and furcula, white ; 



antenn;^ slightly longer than the head ; eye spots black. It is 



impossible to distinguish living specimens of this species from 



the smaller species of Lipura, except when they jump. 



*• Habitat — Maine, Massachusetts, and New York, .albella. Pack. 



Furcula not reaching the ventral tube ; the manubrium distinctly 



longer than the dentes ; superior and inferior claws without 



teeth ; the superior claw wide at base, a short distance from 



which it is suddenly and greatly constricted ; the inferior claw 



with the inner margin dilated at base, rounded out at apex ; 



mucro with three teeth, the first long, subvertical, distinctly 



hooked, the second and third of the same length, on opposite 



sides, and almost opposite ; body, legs, antennae, and furcula, 



blackish ; head elongate ; antennae about as long as the head, 



