THE MYKIAPODA OF NOKT11 AMERICA. 



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

 L. pull us, but until intermediate specimens arc found it is best to con- 

 sider them as distinct species. 



38. Lithobius kochi Stuxht-rg. \Yrst Cliff, Colo.: T. I). A. ( '<> -krrell. 



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

 Penultimate pair of legs armed with two claws. ( 1 ox;e of last t\vo 

 pairs of legs laterally armed. Testaceous brown, antenna 1 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 S 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""". 



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 Aw/i/, which has only been found at Saucelito, Cal. 



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

 mens. 



39. Lithobius atkinsoni Bollman. Marmi, (Ja.: L. M. r 



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 ."> + ." or 7 + 7; coxa- 

 of last three pairs of legs laterally armed : coxa! pores 3. 4, 4, 4-<, 7, 7. <i, 

 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 snlcate on the inner side. 



40. Lithobius xenopus, sp. nov. 



Didf/Hosis. Related to L. wor<la.ic, but The femoral and tibia! joints 

 of the anal legs of male strongly modified. 



II<ihitt. Macon, Ga.; L. M. Underwood. 



'/>/>''.- -Ace. 10542, 22, U. S. Nat. .Museum. 



I)<'scr!))l!o>i. P.rown, head rufous, antenna- 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 <+7. 

 Coxal pores G, (>, <>, 4, round. Spines of first pair of legs 2. .", 2; of 

 penultimate pair 1, 3, 3, 2: of anal pair 1. ">, .".. L'. Claws of anal and 

 penultimate pairs of legs single. Coxa- of the last three pairs of legs 

 laterally armed. 



