THE CHILOPODA OF CALIFORNIA I 369 



of the prosternum is indicated by tiie appropriate figures separated by a dash ; 

 e. g.. 3 — 3, where the number of teeth on each side is three. 



In making use of the keys in the present paper care must be taken to 

 make sure that specimens are fully adult. Even the genera cannot always be 

 ascertained from a study of immature specimens in the present state of our 

 knowledge. 



Four genera of this family are represented in California. 



Key to Genera of the Lithobiidae. 

 a. Coxal pores in several series are scattered. Genus Bothropolys. 



aa. Coxal pores in a single series. 



b. Coxal pores borne upon the last four pairs of coxas. Genus Lithobius 

 bb. Coxal pores borne upon the last five pairs of coxae. 



Genus Pseudolithobiits. 

 Genus Bothropolys Wood. 



The species of this genus known to occur in California may readily be 

 separated by means of the following key : 



Key to Species of Bothropolys. 



a. .Angles of the 9th, 11th and 13th dorsal plates produced (subgenus 



Allobothropolys Ver.). B. xanti Wood, 



aa. Angles of none of the dorsal plates produced (subgenus Archilithobius 



Stuxberg). B. monticola Stuxberg. 



Bothropolys xanti Wood. 



This species is commonly 20 mm. and above in length, being one of 

 the larger members of the Lithobiidae of California. It is brown in general 

 color above, the ultimate segments, head with prehensorial feet, and the legs 

 commonly darker. There are 20 articles to the antenns. The anal legs are 

 long and slender. The claw of the female gonopoda is tripartite, the basal 

 spines numbering 3 — 3. 



B. xanti is common in southern California and along the coast and in the 

 Coast Mts. north to San Francisco and possibly beyond. The author has 

 specimens from San Bernardino County, Los Angeles, Santa Monica, Clare- 

 mont (Pomona Coll. Collection), Santa Barbara and other southern points, 

 and from Stanford, Monterey Co., etc. 



Bothropolys monticola (Stuxberg). 

 Syn. Lithobius californictis Daday, 1889. 

 Cf. also sub Lithobius pusio Stuxberg in present paper. 

 B. monticola is on the average larger than the preceding species. It is 

 darker in color. The dorsum commonly dark brown or mahogany ; the head 

 more reddish ; legs yellowish the posterior pairs darker. Antennae with 

 mostly 20 articles but in some the number may be as large as 27 (variety). 

 Gonopols as in the preceding form. 



After examining material from many different localities, the author is 

 convinced that Stuxberg based his description upon an individual only partly 

 grown and that in enumerating the spines of the anal legs he included some 



