42 BULLETIN 46, UNITED STATES ^NATIONAL MUSEUM. 



Pairs of legs, 9 64 to 67. Length of body, 9 36 lnm ; width 1.2 ,am . 



I have examined a number of specimens collected by Mr. J. H. Burke, 

 of Ukiah, Cal. This species should be placed near G. occidentalis Mei- 

 nert, although it seems to bear little relation to the latter. 



12. Lithobius eigenmanni, sp. uov. 



Diagnosis. — Allied to Lithobius obesus Stuxberg, but the claw of fe- 

 male genitalia tripartite; spines of anal feet 1, 3, 3, 0; coxal pores more 

 numerous. 



Type. — U. S. Nat. Museum. 



Habitat — Glacier, British Columbia. 



Description of type. — Brown, feet paler, slender, moderately rough 

 posteriorly; head scarcely wider than long. Antennae short, articles 

 20, short. Ocelli 8 to 12, arranged in 4 or 5 series. Prosternal teeth 

 2 + 2. Coxa? of 13, 14, 15 pairs of legs laterally armed. Coxal pores 3, 

 4, 4, 3 to 4, 5, 5, 5, large and round. Spines of first pair of feet 1,2, 1 ; 

 penultimate pair 1, 3, 3, to 1, 3, 3, 1 ; anal pair 1, 3, 3, 0. Claw of female 

 genitalia tripartite; spines (2 + 2) stout and short, inner shortest. 



Length of body 7.5 to 9 nmi , width 1.1 to 1.5 mm ; antenna? 3 to 3.5 mi " ; 

 anal legs 3.2 to 3.8 mm . 



I have examined a number of specimens collected by Mr. Carl H. 

 Eigenmann, to whom I take great pleasure in dedicating this species. 



13. Lithobius atkinsoni, sp. nov. 



Diagnosis. — Anal and penultimate pairs of legs each armed with a 

 single claw; joints of antenna? 26, color chestnut. 



Type. — U. S. Nat. Museum. 



Habitat. — Balsam, Jackson County, N. C. 



Description of type. — Chestnut, head and antenna? of a deeper shade, 

 legs orange. Slender, dorsal plates moderately smooth, especially an- 

 teriorly, very sparsely pilose; head obcordate, length and width sub- 

 equal. Antenna? short, reaching to fifth segment, joints 26, small. 

 Ocelli 14-5. Prosternal teeth 5 + 5, small. Coxa of the ( 1) pairs of feet 

 laterally armed. Coxal pores 4, 5, 5, 4, small and round. Spines of first 

 pair of legs 2, 1, 1; penultimate and anal pairs 1, 3, 3, 2. Anal legs 

 somewhat swollen, tarsa? of anal and penultimate pairs of legs silicate 

 on inner side. Claw of female genitalia short, tripartite; spines 2 + 2, 

 inner shortest. 



Length of body 12.5 ,Bm , width 1.8 mm ; antenna? 4 Qim ; anal legs 5" 11 ". 



This species bears no relation to any known from North America; 

 in fact, it is the only one of the subgenus Lithobius with the penulti- 

 mate pair of legs armed with a single claw. 



I have examined one specimen collected by Prof. George F. Atkinson, 

 of the University of North Carolina, to whom 1 have the honor of dedi- 

 cating this species. 



