28 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



12. Lithobius xanti Wood. 



Lithobius xanti Wood, Journ., Acad. Nat. Sci., Phila., 15, 1863. 



Fulvous, feet, antennae and ventral plates pale, head dark. 



Robust, not smooth ; sparsely pilose above, the ventral plate densely 

 pilose posteriorly. 



Head moderate, obcordate, not much wider than long (5.3 : 5) ; smooth, 

 sparsely pilose. 



Antennae long, joints 20, all long. 



Ocelli 12-15, arranged in 6 or 7 series. 



Prosternal teeth 15-20, small, not coadnate on the inner side. 



Coxal pores numerous, arranged in 3-5 series. 



Spines of the iirst pair of feet 2, 3, 1; penultimate (1), 1, 3, 3, 2; last 

 pair (1), 1,3, 2,0, or (1), 1,3,2,1. 



Last pair of feet long, slender, not swollen. 



Claw of the female genitalia long, wide, tripartite, the middle lobe 

 long, the inner very small; spines, 3 on each side, long, slender, and 

 wavy. 



Length of body 20-25 mra ; last pair of legs 9-11 mm . 



Habitat. — California and Oregon. 



I have examined a number of specimens of this species from Ukiah, 

 Cal., collected by Mr. J. H. Burke. 



13. Lithobius politus McNeill. 



Lithobius politus McNeill (MSS.). 



Brown ; head, antennae and edges of dorsal plates dark ; feet and ven- 

 tral plates paler. 



Robust, smooth pilose. 



Head moderate, obcordate, of about equal length and breadth; sparsely 

 pilose. 



Antennae short, joints 20, mostly long. 



Ocelli 15-18, arranged in 6 or 7 series. 



Prosternal teeth 4, small. 



Coxal pores 3, 4, 4, 3-5, 6, 6, 6, round. 



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

 1,3,2,1. 



Last pair of feet moderate, scarcely swollen. 



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

 much longer; spines short and thick, subequal, the outer sometimes in- 

 distinct, notched on the inner side. 



Length of body 8-1 l mm ; last pair of legs 3-4 mm . 



Habitat. — Dublin and Bioomington, Ind., and Ludington, Mich. 



I have examined the types of this species from Dublin, Ind., besides 

 a number of specimens from Ludington, Mich., and one female from 

 Bioomington, Ind. The one from the latter place is larger; the coxal 

 pores are also more numerous and of a larger size. 



