264 DESCRIPTIONS OF LITHOBIlD.E AND SCUTIGERIDiE. 



Claw of the female genitalia wide, tripartite ; spines moderately long 

 and stout, subequal, point of tbe inner sometimes curved inwards. 



Length of body 25""" ; posterior legs 10""". 



Habitat. — Eastern United States. 



I have examined numerous specimens of this species from Blooming- 

 ton, Ind., and Ludington, Mich. 



Specimens 12 "'"' long differ from the adult as follows : 



Violet-brown; head bright chestnut; antennaj and posterior legs 

 lighter. 



Antennae moderate. Joints 20, moaeralely long. 



Ocelli 16-17, arranged in series. 



Coxal pores arranged in 2 or 3 series. 



Length of last pair of legs 5 ™"\ 



Specimens 10""" long differ from the above in having 13 ocelli, ar- 

 ranged in 6 series; coxal pores in 1 or 2 series, and the spines of the 

 first pair of feet 2, 3, 1; length of last pair of legs 3">"', while those 5 '""^ 

 long have the ocelli 8, In 5 series; coxal pores 2, 2, 2,2, in 1 series j 

 spines of the first pair of feet 1, 2, 1 ; length of last pair of legs 2""^. 



Family B.— SCUTIGERID.E (Nervals. 

 Genus II. — Scutigera Lamarck. 



18. Scutigera forceps (Rafiuestiue). 



Sclista forceps Rafinesque, Auuals of Nature, 7, 1820. 

 Scutigera forceps Meinert, Proc. Amer. Philos, Soc, Phila., 171, 18^5. 

 Light brown, dorsal plates with three black stripes, the outer more or 

 less broken, a greenish spot on the posterior border of each plate on 

 each side of the median line; antenna? and tarsi brown, patella and 

 tibia with two bluish bands, those of the last pair of legs dark, almost 

 violet. 



Eobust, dorsal plates with obscure tubercles, spines numerous, ar- 

 ranged in almost regular series. 



Cephalic plate large posteriorly, a moderate sulcus, not much im- 

 pressed, margins not strongly elevated, moderately smooth, wider than 

 long(G:5). 



Antennte rather slender, exceeding the length of body. 



Dorsal plates moderately marginate, outer margin very sparsely 

 spinulose, posterior margin strongly rounded, deeply excised in the 

 middle, spines more numerous than on the outer margin. 



Last dorsal plate narrow, Avith two indistinct transverse sulcations, 

 sides rounded, not converging much, posterior margin obscurely ex- 

 cised. 



All the stomata, except the first, of nearly equal length, first about 

 4 times in length of the dorsal plate. 



Feet moderately carinated, spines rather numerous. 



