1898.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 319 



but as the apparent differences gradually dwindled down to the number 

 of spines of the first pair of legs I finally concluded that they were iden- 

 tical with kochi, which has only been found at Saucelito, Cal. 



For the sake of completeness I have given a description of the spec- 

 imens. 



39. Littleobius atkinsoni Bolhuaii. Macon, Ga., L. M. Uuderwood. 



Among the material sent by Dr. Underwood are three specimens, 

 two females and one male that I refer to this species. 



The following points are worthy of notice: Antena? 21-33 articulated ; 

 ocelli 8-20, arranged in 4-7 series; prosterual teeth 5+5 or 7 + 7; 

 coxae of last three pairs of legs laterally armed; coxal pores 3, 4, 4, 4- 

 6, 7, 7, 6, round or transverse ; spines of first pair of legs 1, 2, 1 or 2, 

 3, 1 ; spines of anal and penultimate pairs 1, 3, 3, 1 ; last two tarsal 

 joints of anal and penultimate pairs of legs of male silicate on the 

 inner side. 



40. Lithobius xenopus, sp. nov. 



Diagnosis. — Related to L. mordax, but the femoral and tibial joints of 

 the anal legs of male strongly modified. 



Habitat. — Macon, Ga. ; L. M. Underwood. 



Type.— Ace. 19542, 22 U. S. Nat. Museum 



Description. — Brown, head rufous, antenna: dark, legs pale. Moder- 

 ately slender, rather smooth, sparsely pilose; head wider than long 

 (4:3). Antenna j moderately long, reaching the seventh segment, ar- 

 ticles 30, short. Ocelli 32, in 7 transverse series. Prosternal teeth 

 6+7. Coxal pores 6, 6, 6, 4, round. Spines of first pair of legs 2, 3, 2 ; 

 of penultimate pair 1, 3, 3, 2; of anal pair 1, 3, 3, 2. Claws of anal 

 and penultimate pairs of legs single. Coxa" of the last three pairs of 

 legs laterally armed. 



Male : Anal legs moderately short ; femora considerably swollen on 

 the inner side, and armed on the posterior half with two large, slightly 

 curved, bluntly serrated spines; tibia excavated on the inner side, 

 the posterior half produced into a bipartite contorted lobe, of which 

 the posterior is armed with a short, curved, sharply serrated spine. 

 The last two tarsal joints of anal and penultimate pairs of legs sulcate 

 on the inner side. Length 17.5 mui . 



Although the males of nearly every species of the subgenus S eolith- 

 obius show some modifications of the anal legs, yet this species presents 

 a curious peculiarity and approaches to that of L. bUabiatus in the ex- 

 tent of the modification. The above description is based upon a single 

 male specimen. 



41. Lithobius latzeli Meiuert. Marksville and Luray, Va.; L. M. Underwood. 

 Antenna 29-34; coxal pores 5, G, 5, 4-6, 7, 7, 6; prosternal-teeth 9+9 



or 10+10; spines of first pair of legs 2, 3, 2; spines of anal and pen- 

 ultimate pairs 1, 3, 3, 2. 



