THE MYKIAPODA OF NORTH AMERICA. 31 



First pair of feet armed with 2, 3, 1-2, 3, 2 spines; penultimate 1, 3, 3, 

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



Last pair of feet long, not swollen. 



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

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



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



Habitat. Eastern United States. 



I have examined numerous specimens of this species from Blooming- 

 ton, Ind., and Ludington, Mich. 



Specimens 12 mm long differ from the adult as follows: 



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

 lighter. 



Antemiie moderate, joints 20, moderately long. 



Ocelli 1G-17, arranged in 6 series. 



Coxal pores arranged in 2 or 3 series. 



Length of last pair of legs 5 mm . 



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

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

 first pair of feet 2, :$, 1; length of last pair of legs 3 mn >, while those 5 mm 

 long have the ocelli 8, in 5 series; coxal pores 2, 2, 2, 2, in one series; 

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



Family B. SCUTIGEEID.E Gervals. 

 Genus II. SCUTIGKERA Lamarck. 



18. Scutigera forceps (Rafiuesque). 



Si'lixtit /</<< /<* U'alinrsinie, Anuuls of Nature, 7, 18^0. 



Si-'ttii/ini fi>r<-i-ii Meinert, Proc. Amcr. 1'hilns. Sue.. 1'liila., 171, 1S*.">. 



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. 



Robust, 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 (6:5). 



Antenna- rather slender, exceeding the length of body. 



Dorsal plates moderately marginal, 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, with two indistinct transverse sulcations, 

 sides rounded, not converging much, posterior margin obseurcly ex 

 cised. 



