THE MYRIAPODA OF NORTH AMERICA. 23 



This species is described from one specimen collected by Mr. Walter 

 D. Howe. It is related to Lithob'nix pullus, but is distinguished by its 

 larger size, the joints of the antenna', the coxal pores, and a few points 

 about the claw of the female genitalia. 



3. Lithobius bilabiatus Wood. 



LUhol'nis bilalriatus Wood, Proc. Acad. Nat. Sci. Phil., 130, 1867. (Hock- 

 Island, III.) 



Brown, head darkest, feet and ventral lamina- paler, the tip of an- 

 teunre rufous. 



Somewhat robust, smooth, a little roughened posteriorly; sparsely 

 hirsute, ventral laminae sometimes almost densely hirsute posteriorly. 

 Head large, obcordate, of nearly equal length and breadth, nearly 

 smooth, sparsely pilose. 



Antennae short, joints 20-23, mostly long, densely hirsute. 



Ocelli distinct, 11-20, arranged in 5-7 series. 



Prosternal teeth 4-S, moderately large and stout. 



Coxal pores 3, 4, 4, 3-4, 5, 5, 4, round; sometimes the depression is 

 shallow and the pores indistinct. 



Spines of the first pair of feet 2, 2, 2-2, :!. 2; penultimate 1, ;j, 3, 1- 

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



Posterior feet rather short, moderately swollen. 



Claw of the female genitalia large and stout, whole; spines short and 

 strong, the inner shortest. 



Length of body 12-18 mm ; last pair of legs 5-0""". 



Habitat. Illinois (Rock Island), Indiana (Bloomington), Michigan 

 (Ludington, .N". B. Pierce). 



I have examined a large number of specimens of this species from 

 Bloomington, Ind., and one from Ludington, Mich. 



4. Lithobius tuber, sp. nov. 



Litliobiitx hilabiatusWood., Proc. Acad. Nat. Sci. 1'hila., l:io, 1SH7. (Rock Inland, 

 Illinois, In part ; not ti/pe.) 



Brown, head and antenna- darkest, tip of latter rufous, feet and ven- 

 tral plates pale. 



Robust, moderately smooth; dorsal plates sparsely pilose; ventral 

 more densely pilose posteriorly. 



Head large, obcordate, wider than long (3. ~>: .'>), moderately smooth, 

 sparsely pilose. 



Antennai moderate, joints 20, mostly long and stout, moderately 

 pilose. 



Ocelli, 11-13, arranged in ."> or < series.. 



Prosternal teeth 4-0, small. 



Coxal pores 4, 4, 5, 5-4, .">, .", 4, large and -oiind. 



Spines of the first pair of feet, 2, :;, 2; penultimate, t l, ."., ."., 1. 91, 3, 

 3, 2; last pair, <5 1, 3, 2, 0, 9 1, 3 (4), 2, 0. 



The last pair of legs moderate, swollen ; the inner side provided with 



