THE MYRIAPODA OF NORTH AMERICA. 25 



Rather robust, smooth; sparsely hirsute, more densely beneath. 



Head obcordate, longer than wide (7:6); moderately smooth; sparsely 

 pilose. 



Antennae short, joints 20, not as short as in the preceding'; the last 

 joint long and sharp. 



Ocelli moderate, 10-12, in o series. 



Prosternal teeth 4, small and indistinct. 



Coxal pores 2, 2, 2, 2-3, 4, 3, 3, moderately large and round. 



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

 3, 3, 2; last pair 1, 3, 3, 0-1, 3, 3, 1. 



Posterior pair of feet rather short, not swollen. 



Claw of the female genitalia tripartite, the middle lobe by far longer 

 than the others, which are small and indistinct ; spines short and ro- 

 bust, the iuner shortest. 



Leugth of body 9-ll mm ; last pair of legs 3 mm . 



Habitat. — Bloomington, Ind. 



I have over a dozen specimens of this species. 



7. Lithobius trilobus, sp. uov. 



Brown; head and the last 3-4 segments darkest; feet and ventral 

 lamina? gray-brown; tip of antennae and preheusorial feet chestnut. 



Rather slender, but wide and thin, moderately smooth; sparsely 

 pilose, the ventral laminae more densely. 



Head obcordate, a little longer than wide (6. 5 : G. 2) ; nearly smooth ; 

 sparsely pilose. • 



Antennae short, joints 20, mostly short, the last moderately long and 

 blunt; densely pilose. 



Ocelli 18-25, arranged in 7-8 series. 



Prosternal teeth 4, small and iudistinct. 



Coxal pores 3, 4, 4, 3-4, o, 5, 4, large and round. 



First pair of feet armed with 1, 3, 1 spines; penultimate 1, 3, 1, 0-1, 

 3, 2, 1 ; last pair 1, 3, 1, 0. 



Posterior pair of feet moderately long, not swollen ; in the male the 

 fifth joint is produced into a short lobe on the inner side. 



Claw of the female genitalia wide, tripartite, the middle lobe not 

 much longer than the others; spines rather short and stout. 



Length of body 10-12 mm ; last pair of legs 3. 5 m "\ 



Habitat. — Bloomington, Ind. 



Tbis species is described from a number of specimens. 



It is easily distinguished from the preceding by the claw of the 

 female genitalia and by the greater number of ocelli. 



8. Lithobius cardinalis, 6p. now 



Brown; head, tip of antennas and last pair of legs chestnut; ventral 

 laminae and feet light. 



Slender, smooth; sparsely pilose. 



Head large, subcircular, wider than long (7: 6); sparsely pilose. 



