THE MYRIAPODA OF NORTH AMERICA. 27 



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

 pair 1, 3, 3, 2. 



Last pair of feet moderately long and swollen. 



Claw of tlie female genitalia not wide, indistinct tripartite, the middle 

 lobe much longer; spines slender, the inner shortest. 



Length of body 15 mm ; last pair of legs 9 mm . 



Habitat. — TJkiah, Cal. (J. H. Burke), and Mexico. 



This species is described from one female, from the former locality, 

 which has the antennae and posterior legs broken off. Having only a 

 short description of aztecus, I do not feel sure of my identification, 

 although it agrees with it as far as it goes. 



11. Lithobius forficatus Linnaeus. 



Scolopendra forficata Linmeus, Syst. Nat. Ed. x, I, 638, 1758. 

 Lithobius forficatus Leach, Edinb. Encycl., vii, 408, 1815. 



Brown, of varying shades; feet and ventral laminae paler; tip of an- 

 tennre rufous. 



Bobust, not smooth; a little hirsute, especially posteriorly, and along 

 the edges of the dorsal laminae. 



Head large, subquadrate, much wider than long (8: 5. 5), rough, 

 punctate, especially the frontal plate. 



Antennae long, joints 33-43, mostly short, densely hirsute. 



Ocelli distinct or not, 23-4S, arranged in 6-8 series. 



Prosternal teeth moderate, 8-12. 



Coxal pores 6, 6, 6, 4-9, 10, 9, 6, transverse or round in younger 

 specimens. 



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

 pair 1, 3, 3, 2. 



Posterior feet long, not much inflated. 

 * Claw of the female genitalia trilobed, the middle lobe much longer; 

 spines short, robust, the inner shortest. 



Length of body 18-2S mm j last pair of feet 10 mm . 



Habitat. — Eastern United States. 



I have examined about a dozen specimens of this species from Lud- 

 ington, Mich., and one from Bloomington, Ind. One female has the 

 claw of the genitalia four-lobed — having two divisions on the inner 

 side of the middle lobe. 



The following is a description of a young specimen : 



Antennae 32-jointed. 



Ocelli 14, in 6 series. 



Prosternal teeth 6-10. 



Coxal pores 3, 3, 3, 3, round. 



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

 pair, 1 , 3, 2, 0. 



Length of body ll mm ; last pair of feet 4 ram . 



