1904.] NATURAL SCIENCES OF PHILADELPHIA. 653 



claw armed with a single spine; spines 1, 3, 3, 2. Spines of first legs 

 1, 2, 1-1, 1, 1. 



Coxal pores small, round, 4(5), 4, 4, 4. 



Claw of female gonopods entire, long and acute; basal spines coni- 

 cally acuminate, the inner shorter. 



Length 15 mm.; width 2 mm. 



Locality. — Austin, Texas (Prof. J. H. Comstock). 



Lithobius navigans sp. nov. 



Reddish to purplish brown, the middle plates lightest; head yellow; 

 antennse dark brown basally, becoming yellow distally; presternum 

 and legs yellow; venter yellowish, the first and the last plates darker. 



None of the dorsal plates with posterior angles produced. 



Antennse short (2 mm.) ; articles 28 or 29, short. 



OcelH 12 in 3 series (5, 1 + 5, 1). 



Presternal teeth 2-2, small. 



Posterior coxse unarmed beneath or laterally. Anal legs wdth claw 

 armed with a single spine; spines 1, 3, 3, 1. Spines of penult legs 

 1, 3, 3, 1. Spines of first legs 0, 1, 1. 



Coxal pores 2, 3, 3, 2-3, 4, 4, 4, small, round. 



Claw of female gonopods tripartite, lobes acute, the middle longest; 

 basal spines 2-2, short, equal, a little clavatcly thickened upward and 

 then conically pointed. 



Length 7 mm. (c?)-7.5 mm. ( ? ). 



Locality. — Bermudas (Prof. J. H. Comstock). 



Several specimens, d^ and 9 . It is related to the European species 

 lapidicola Mein,, but is sufficiently distinct to warrant separation. In 

 the same collection were specimens of Lithobius provocator Poc, Mecis- 

 tocephalus guildingii Newp., and Julus moreleti Lucas, all previously 

 reported from this locahty. 



Peotiniunguis montereus sp. nov. 



Very similar in general appearance and structure to P. americanus 

 Boll., but readily separated from this as also from the other two previ- 

 ously described species by the fact that the anal legs are each armed 

 with a large claw. In plusiodontus Att. there is a mere vestige of a 

 claw, while in the other species there is no trace of one. 



The known species of this genus may be separated by means of the 

 following key: 



a. — Prebasal plate exposed. 



a'. — Anal legs armed with a claw, montereus sp. nov. 



b'. — ^Anal legs unarmed, americanus Boll. 



