THE CANADIAN ENTOMOLOGIST. . 49 



8. Mucro with the first tooth horizontal, without any tendency towards 



forming a vertical or subvertical hook 9. 



Mucro with the first tooth vertical or subvertical, at least somewhat 

 hooked 1 1 • 



9. Mucro with two teeth ' 10. 



Mucro with three teeth — the first very short, horizontal, appearing 



somewhat as when the first tooth is at the base of the second ; 

 the second and third, long, vertical, subequal. There is a 

 round knot-like prominence at the base of the mucro, but it is 

 not tooth-like ; superior claw without teeth on the outer and 

 inner margins ; inferior claw scarcely dilated on the inner 

 margin, with a tooth at middle ; dentes twice the length of the 

 manubrium ; the furcula reaching the ventral tube ; body, legs 

 and furcula, yellowish ; eye spot black ; antenm^ a little longer 

 than the head, purplish at apex. Habitat — Salem, 

 Ohio aequalis, n. sp. 



10. Manubrium longer than the dentes ; furcula not reaching the ventral 



tube ; superior claw without teeth on the outer and inner 

 margins ; inferior claw with the inner margin not at all dilated, 

 and without teeth ; tibisw with two tenant hairs ; body mottled 

 grayish, paler at the apices of the segments ; antennae and legs 

 white ; antennas but little longer than the head ; body long and 

 slender. Habitat — Fort Collins, Colorado (Carl 



F. Baker) elongata, n. sp. 



Manubrium shorter than the dentes, not extending beyond the apex 

 of the abdomen ; furcula not reaching the ventral tube ; 

 superior and inferior claws without teeth ; inner margin of the 

 inferior claw greatly and roundly dilated ; mucro with two 

 teeth — the first horizontal and pointedly rounded, the second 

 vertical, of the same length as the first, pointed at apex ; body, 

 legs, antennfe, and furcula, white ; antennas not longer than the 

 head. Collected on water drawn from a well. Habitat — Baton 

 Rouge, Louisiana (H. A. Morgan) manubriata, n. sp. 



1 1 . Mucro with two teeth 12. 



Mucro with three or more 13, 



12. Teeth of mucro indistinct ; mucro shaped like a portion of the rim of 



a wagon wheel, the cut end transversely emarginate, the dorsal 

 and ventral corners forming the teeth ; the superior and 



