548 The Ohio Naturalist. [Vol. VI, No. 8, 



LL: Fourth abdominal segment 

 4-0 times as long as third. 

 M : Fourth abdominal seg- 

 ment, 5 times as 

 long as third, (i 

 ocelli on either side 

 Gen: 15(26) 

 Trichocorypha. 

 MM: Fourth abdominal seg- 

 ment 4 times as 

 long as third. 

 N : 8 Ocelli on either 

 side. 



Gen: 16(27) 

 Seira. 

 NN : 4 Ocelli on either 

 side. 



Gen: 17(28) 

 Paronella. 

 II: Pronotum extending over head and par- 

 tially concealing it. 

 J: 8 Ocelli on either side. 



Gen: 18 (29) Lepidocyrtus. 

 JJ: 6 Ocelli on either side. 



Gen: 19 (30) Calistella. 

 FF: Antennae of 5 segments. 



G: Eye-spot with 1 ocellus, terminal segment of anten- 

 nae annulate. 



Gen: 20 (31) Templetonia. 

 GG: Eye-spot with 8 ocelli, terminal segment of antennae 

 simple. Gen: 21(32 Strongylonotus. 



CO: Saltatorial appandege attached to antipenultimate abdominal segment. 



Fam: 7. PODURIDAE. 

 D: Mouth-parts extending cone-like from front of head. 



Gen: 1 (33) Gnathocephalus. 

 DD: Mouth-parts not appearing cone-like from front of head. 



E: Antennae of 5 segments. Gen: 2 (34) Deuterolubbockia. 



EE: Antennae of 4 segments. 

 Tarsus with 2 claws. 



G: Abdomen without terminal spur. 



Gen: 3 (So) Achorutes. 

 GG: Abdomen with terminal spurs. 



H : Abdomen with 2 terminal spurs. 



Gen: 4 (36) Schoturus. 

 HH: Abdomen with 4 terminal spurs. 



Gen: 5 (37) Tetracanthella. 

 FF: Tarsus with 1 claw. 



G: Ocelli, 14-15 on either side. 



Gen: 6 (3S) Podurhippus. 

 GG: Less than 14-15 ocelli on either side. 

 H: Terminal spur absent. 



I: Saltatorial organ long, curved, extending 

 from posterior end of body. 



Gen: 7 (39) Podura. 

 II: Saltatorial organ short, simple, not reach- 

 ing the posterior end of body. 

 J: Legs long, distinctly visible from 

 above. 



Gen: 8 (40) Pseudachorutes. 



