THE MYRIAPODA OF NORTH AMERICA. 29 



Subgenus NeoUtholriux Stuxberg. 



14. Lithobius mordax Koch. 



LithobiiiH monlar Koch., Die Myriapodengattung Lithobius, 34, 1862. 



Brown, ventral lamina?, feet and tip of antennae light; prehensorial 

 feet bright chestnut. 



Kobust, not smooth, more so posteriorly. 



Head subcordate, slightly longer than wide; punctate. 



Antennae long, joints 31-38, mostly small; densely pilose. 



Ocelli numerous, 34-50, in 7-10 series. 



Prostemal teeth 12-14, stout, conic, not crowded much together. 



Coxal pores 7, 7, 6, 5-10, 10, 10, 9, large, nearly all transverse. 



First pair of feet armed with 2, 2, 1-3, 3, 2 spines; penultimate 1, 3, 3, 

 2 ; last pair 1, 3, 3, 1, or 1, 3, 3, 2. 



Posterior feet rather long, scarcely inflated. 



Claw of the female genitalia large, trilobed, the middle one by far the 

 largest; spines rather long and slender, the inner shortest. 



Length of body 20-20'""'; last pair of legs 10-11 1 " 1 ". 



Habitat. Indiana, Kansas, Louisiana, Mississippi, and Florida. 



1 have examined specimens of this species from Blooinington, Ind., 

 and Pensacola, Fla. Those from the latter locality have the coxal pores 

 more numerous, the spines of the first pair of feet less, and a lighter 

 coloration. One specimen 18 mm long, from the same place, has the ocelli 

 25 in number. 



15. Lithobius clarus McXeill. 



Lithobius clarwa McNeill (MSS.). 



Yellowish-brown; edges of scuta darker, antennre dark, tip rufous; 

 ventral lamina/ and feet somewhat paler. 



Bather slender, scarcely robust, smooth. 



Head obcordate, length and breadth equal; a little rough. 



Antennae moderately long, joints 20-30, becoming shorter towards 

 the end, not densely pilose. 



Ocelli moderate, 20-27, in 5-7 series. 



Prosternal teeth S, short, evenly separated. 



Coxal pores few, 4, 4, 5, 3-4, 5, 5, 4, round. 



Spines of first pair of feet 1,3,2-2,3,2; penultimate 1,3,3,2; last 

 pair 1, 3, 3, 1-1, 3, 3, 2. 



Last pair of feet long, not inflated. 



Claw of female genitalia broad, trilobed, the middle loin- about U as 

 long again as the others; spines moderately long and slender, the inner 

 shortest. 



Length of body 15"""; last pair of feet <""". 



11 i(hi tut. Pensacola, Fla. 



The above description is taken from part of the type specimens. The 

 following is a description of a young specimen: 



