1909] Geophilidae and Lithobiidae 189 



This species seems to lie closest to Lithobius exiguus Meinert, 

 found in New York. In Utah, the new form is commonest under 

 the bark of decaying logs. 



35. Lithobius sokovus sp. no v. 



General color of body and legs above and beneath pale vellow to 

 3'ellowish white; praesternum and prehensorial feet, and head light 

 brown ; antennae light brown to yellow. 



Angles of none of the dorsal plates produced. 



Head subcordiform, about equal in length and breadth. 



Antennae with 19 articles, which are short, the ultimate in length 

 about equalling the two preceding together. 



OceUi 8 in number, arranged in two series (1+-1:, 3), decreasing in 

 size in each series from most posterior to the anterior one. 



Presternal teeth 2-2, very small, brown in color. 



Anal legs with claw unarmed; spines 1, 3, 2, 0. Penult legs with 

 claws each armed with a single spine. Spines of first legs 1, 2, 1. 



Coxal pores small, round, 1, 2, 2, 2. 



Male: femur of anal legs near middle of dorsal or dorso-mesal 

 surface with a knot-like elevation, somewhat expanded at distal end 

 in contact with the tibia. Tibia with a ridge-like elevation extending 

 for entire length along the dorso-mesal surface, this extended at prox- 

 mal end into a rounded lobe much as in clavigerens, the lobe bearing a 

 spine which is curved caudad at its distal end. 



Female: claw of gonopods tripartite; basal spines 2-2. 



Locality — Las Vegas, Nevada. In loose soil from six inches 

 to a foot below the surface. 



36. Lithobius bonvillensis sp. no v. 



Dorsum from light to blackish brown, the posterior border of most 

 of the major plates usually lighter; head paler, brown or light brown, 

 sometimes with a darker median area caudad of the frontal suture; 

 antennae brown to blackish, yellowish or rufous distallv; praesternum 

 and feet concolorous with head; venter light brown to yellowish, the 

 first and the last plates darkest; legs yellowish, the last few pairs 

 sometimes darker. 



Angles of none of dorsal plates produced. 



Head a little wider than long (as 3:2.9). 



Antennae short; the first two articles long, others short, closelv 

 crowded; articles 29 in number. 



Ocelli S-9, moderate in size, arranged in two series (1-^4 3 or 

 1+5,3). 



Praesternal teeth 2-2, small, scarcely darkened. 



Posterior coxae unarmed above, laterally or beneath. Anal legs 

 with the claws each armed with two spines; spines 1, 3, 2, 0. Penult 

 legs with the claws each armed with two spines; spines 1, 3, 2, 1. 

 Spines of first legs 0, 0, 1 . 



