102 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



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 silicate on 

 the inner side. Length, 17.5" 1 " 1 . 



Although the males of nearly every species of the subgenus Neolitho- 

 bius show some modifications of the anal legs, yet this sj)ecies presents 

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

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

 male specimen. 



41. Lithobius latzeli Meinert. Marksville arid Luray, Va. ; L. M. Underwood. 

 Antenna?, 29-34; coxal pores, 5, 6. 5, 4-6, 7, 7, G; prosternal teeth, 



9+9 or 10+10; spines of first pair of legs, 2, 3, 2; spines of anal and 

 penultimate pairs, 1, 3, 3, 2. 



42. Lithobius underwoodi, sp. no v. 



Diagnosis. — Eelated to L. juvenilis, but the prosternal teeth 6+7; 

 coxal pores, 7, 7, 7, 6, transverse; size much larger. 



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



Type.— Ace. 19542, 22; IT. S. Nat. Museum. 



Description. — Dark shining brown, head and antenna? darkest, legs 

 paler. Robust, attenuated posteriorly, moderately smooth; head wider 

 than long (4:3). Antenna? long, extending to the tenth segment, arti- 

 cles 32. Ocelli 25, in 6 transverse series. Prosternal teeth 6 + 7. Coxal 

 pores, 7, 7, 7, 6, transverse. Spines of first pair of legs, 2, 3, 2; of 

 penultimate and anal pair, 1, 3, 3, 2. Anal and penultimate pairs of 

 legs each with two claws. Coxa? of the last three pairs of legs laterally 

 armed. 



Female: The last two tarsal joints of anal and penultimate pairs of 

 legs sulcate on the inner side; claw of genitalia large and long, indis- 

 tinctly tripartite; spines 2+2, stout, inner shortest. Length, 20 mni . 



This species is very different from L. juventus, which is the only 

 North American species belonging to the same group, although they 

 may have originally sprung from the same stock. This species is de- 

 scribed from a female which has the anal pairs of legs broken off. 



43. Lithobius rex, sp. nov. 



Diagnosis. — Related to L. validus, of Europe, but the antenna? 20- 

 jointed. 



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



Type.— Ace. 19542, 21; U. S. Nat. Museum. 



Description. — Grayish-brown, head, antenna?, first dorsal plate, and 

 margins of others dark. Robust, attenuated posteriorly, dorsal plates 

 much wrinkled, sparsely pilose; head wider than long (6:5). Antenna? 



