THE MYRIAPODA OF NORTH AMERICA. 101 



Time may prove that this new species is only an eastern variety of 

 L.pullus, but until intermediate specimens air found it is best to con- 

 sider them as distinct species. 



38. Lithobius kochi Stuxberg. West Cliff, Colo.; T. D. A. Cockerell. 



Anal legs armed with two claws. Coxal pores lew in a single series. 

 Penultimate pair of legs armed with two claws. Coxae of last two 

 pairs of legs laterally armed. Testaceous brown, antennae and head 

 darkest, legs paler. Moderately slender, smooth, sparsely pilose; head 

 of about equal length and breadth. Antenna? short, reaching to the 

 fifth segment, articles 20. Ocelli 8 or 9, arranged in 4 series. Pro- 

 sternal teeth 2 + 2. Coxal pores 2, 2, 3, 3-3, 3, 3, 3, round. Spines 

 of first pair of legs 1, 1, 1; of penultimate pair 1, 3, 3, 2; of anal pair 

 1, 3, 2, 0. 



Male: Anal legs somewhat stouter than those of female. Female: 

 Claw of genitalia bipartite, short and wide; spines 2 + 2; inner much 

 shorter. Length 7-7.8 1 ' 11 ". 



I at first considered these specimens as representing a new species, 

 but as the apparent differences gradually dwindled down to the num- 

 ber of spines of the first pair of legs, I finally concluded that they were 

 identical with kochi, whicb has only been found at Sauce! ito, Cal. 



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

 mens. 



39. Lithobius atkinsoni Bollman. Macon, 6a.; L. M. Underwood. 



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: Antenna? 21-33 articulated; 

 ocelli 8-20, arranged in 4-7 series; prosternal teeth 5+5or 7 + 7; coxa* 

 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 sulcate on the inner side. 



40. Lithobius xenopus. sp. uov. 



' Diagnosis. — Eelated to L. mordax, but the femoral and tibial joints 

 of the anal legs of male strongly modified. 



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



Type.- -Aca. 19542, 22, U. S. Nat. Museum. 



Description. — Brown, head rufous, antenna 1 dark, legs pale. Moder- 

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

 (4:3). Antenna? moderately long, reaching the seventh segment, arti- 

 cles 30, short. Ocelli 32, in 7 transverse series. Prosternal teeth 0+7. 

 Coxal pores 6, 0, 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. 



