^'^-^ PROCEEDINGS OF THE ACADEMY OF [Feb., 



NEW LITHOBII FEOM CALIFOKNIA AND OREGON. 



BY RALPH V. CHAMBERLIN. 



Since Dr. Anton Stuxberg published his Lithohioida Ajyiericce 

 Borealis in 1875, very Httle has been added to our knowledge of the 

 Lithobii of the Pacific coast region. A study of somewhat extensive 

 collections made at various points in California and Oregon during 

 1902 enables me now to present descriptions of ten species not previ- 

 ously recorded , as well as to identify with certainty various species 

 described by earlier writers. In the key which follows I have included, 

 in addition to the new forms, also such other related species as seemed 

 proper for purposes of comparison: 



Analytical Key to Species Considered. 



A. — Coxal pores in several series (Bothropolys). 



Qj. — Angles of the 9th, 11th and 13th dorsal plates produced. 

 6i. — Articles of antennae 28-31 ; pairs of ocelli 30; coxal pores 

 round or oval; length 15-18 mm., width 2.2 mm.; 

 length of anal legs 6 mm., . aztecus Humb. et Sauss. 

 bj. — Articles of antennae 42-46; pairs of ocelli 16-21; coxal 

 pores strongly transverse (adults); length 22-23 mm., 

 width 3.3-3.4 mm.; length of anal legs 10.5 mm., 



chumasanus sp. nov. 

 a^. — Angles of none of the dorsal plates produced. 



bi.— Articles of antennae 20; pairs of ocelli 7-9 in 2 series; 

 prosternal teeth 6-6; spines of anal legs 1, 4, 3, 1- 



1, 4, 3, 2; length 18 mm monticola Stux. 



h^. — Articles of antennae 23-27 (normally); pairs of ocelh 

 17-21 in 4 or 5 series; prosternal teeth 8-8 to 13-13; 

 spines of anal legs 1, 3, 2. 1 ; length 20-24 mm., 



I sierravagus sp. nov. 



B. — Coxal pores in a single series (Lithobius). 



flj. — Angles of the 9th, 11th and 13th dorsal plates produced. 

 6. J — Articles of antennae 26-28; prosternal teeth 2-2; pos- 

 terior coxae unarmed laterally; spines of penult legs 

 1, 3, 3, 1, of anal 1 3, 2, 1 . . . . angelus sp. nov. 

 6,. — Articles of antennae 39-44; prosternal teeth 4-4; pos- 

 terior coxae armed laterally; spines of penult legs 

 1, 3, 3, 2, of anal 1, 3, 3, 1, . . . hellulus sp. nov. 

 (ij. — Angles of none of the dorsal plates produced. 



