256 DESCRIPTIONS OF LITHOBIID^ AND SCUTIGERID^. 



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

 D. Howe. It is related to Lithoblus pullus, but is distinguished bj' its 

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

 about the claw of tiie female genitalia. 



3. Lithobius bilabiatus Wood. 



Lithoblus hUahiatits Wood, rroc. Acad. Nat. Sci., Phil., 130, 1867. {Bocl< 

 Island, JU.) 



Brown, head darkest, feet and ventral lamin?e paler, the tip of an- 

 teuniiB rufous. 



Somewhat robust, smooth, a little roughened posteriorly ; sparsely 

 hirsute, vontriil larain;e sometimes almost densely hirsute posteriorly. 

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

 smooth, sparsely pilose. 



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



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



Prosternal teeth 4-8, moderately large and stout. 



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

 shallow and the porps indistinct. 



Spines of the first pair of feet 2, 2, 2-2, 3, 2 ; penultimate 1, 3, 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'"'" ; last pair of legs o-e™'^^ 



Habitat. — Illinois (Rock Island), Indiana (Bloomingtou), Michigan 

 (Ludington, X. B. Pierce). 



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

 Bloomingtou, Ind., and one from Ludington, Michigan. 



4. Lithobius tuber, sp. nov. 



Lithobius bilabiatus Wood, Proc. Acad. Nat. Sci. Phila.,130, 18(37. (Bock 

 Island, Illinois, in part; not type.) 



Brown, head andantenu?e darkest, tip oflatter rufous, feet and ventral 

 plates pale. 



Robust, moderately smooth; dorsal plates sparsely pilose; ventral 

 more densely pilose posteriorly. 



Head large, obcordate, wider than long (3, 5 : 3), moderately smooth, 

 sparsely pilose. 



Antennfe moderate, joints 20, mostly long and stout, moderately pilose. 



Ocelli 11-13, arranged in !j or 6 series. 



Prosternal teeth 4-G, small. 



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



Spines of the first pair of feet 2, 3, 2 ; penultimate S 1, 3, 3, 1, 9 1, 3,- 

 3, 2 ; last pair $ 1, 3, 2, 0, 2 1, 3 (4), 2, 0. 



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

 l)eculiar knobs in both male and female; male, the end of the third 



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