44 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Ib. Coxal pores iii a single series, transverse. 



c. Penultimate pair 'of legs armed with a single claw; antenna; 30 to 38, jointed; 

 prosternal teetli 6 + 6 or 7 + 7; last two tarsal joints of until legs dis- 

 tinctly or not sulcate mordar KOCH. 



cc. Penultimate pair of legs armed with a double claw. 



(I. Lasttwotarsaljoint8ofan.il legs sulcate on inner side, likewise the penul- 

 timate pair ; antenna' 31 to 36, jointed ; prosternal teeth 6 -}- 6 to 8 +8 ; 



length of body 18 to 26""" iyrannicus BOLLMAN. 



dd. Last two tarsal joints of anal and penultimate pairs of legs not sulcate; 

 antenna? 40 to 49, jointed ; prosterual teeth 6 + 6 to 11 + 11; length of 



body 20 to 37 mm vorax MEIXKHT. 



libh. Coxal pores in several series ; claws of penultimate pair of feet two ; joints of 

 antenme 40 to 47; ocelli 13-4 to 26-5; prosterual teeth 8 + 8 to 10 + 10; 



claw of female geuitalia not divided terrain FEDRIZZI. 



aa. Anal and penultimate pairs of legs each armed with two claws; coxal pores in a 

 single series, round; coxa not armed beneath; antenna; 31 or 32, 

 jointed; prosternal teeth 2 + 2; spines of first pair of feet 1, 1, 1. 



jin-entits BOLLMAN. 



Iii the above key I have introduced the European species, Lithoblus 

 ten-eus Fedrizzi; I can not find any true specific characters to separate 

 Lithobius leptopns Latzel from it. 



Concerning- the geographical distribution of these species I may say 

 that transmarinm has been found in Louisiana, Arkansas, and Indian 

 Territory; darns in Florida; latzeli in Virginia and North Carolina; 

 mordax from Florida to Indian Territory, then north to Minnesota ; tyr- 

 annicus in Indiana; rorax from Mississippi to Indian Territory; and 

 juventns in Indiana and Tennessee. 



INDIANA UNIVERSITY, January 20, 1888. 



