350 NOTES ON MYRIAPODS. 



42. Lithobius underwoodi, Bp. nov. 



Diagnosis, — Belated to L.juventus, but the prosterual teeth 6+7; coxal 

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



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



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



Description. — Dark shining brown, head and antennae darkest, legs 

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

 than long (4 : 3). Antennae long, extending to the tenth segment, articles 

 32. Ocelli 25, in 6 transverse series. Prosterual teeth G+7. Coxal 

 pores 7, 7, 7, G, transverse. Spines of first pair of legs 2, 3, 2 ; of pen- 

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

 each with two claws. Coxre of the last tkree pairs of legs laterally 

 armed. 



Female: The last two tarsal joints of anal aud 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 mm . 



This species is very different from L. juveutus, 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. now 



Diagnosis. — Related to L. calidus, of Europe, but the antennae 20- 

 joiuted. 



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



Tape.- 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). Antennae 

 long, extending to the ninth segment, articles 20, long. Ocelli 19, in 

 transverse series. Prosternal teeth 9 + 9. Coxal pores 8, 8, 8, 7, large, 

 transverse. Spines of the first pair of legs 1, 3, 2; of penultimate pair 

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



Female: Claw of genitalia wide and short, tripartite; spines 2 + 2, 

 short and stout, ends flattened and obscurely serrate. Leugth 25 mm . 



This species is described from a female specimen, which has the fourth 

 segment considerably angulated, and I at first placed it in a new sub- 

 genus. But a study of multidentatus showed that the angulation of 

 the fourth dorsal plate was subject to considerable variation. 



This is the only North American species of the subgenus Eulithobius 

 that has the coxal pores in a single series, and in this respect approaches 

 L. vali las of Europe; but that species has 40-48 antennal joints. Ace. 

 19542, 21 contains a female of this species. 



44. Lithobius multidentatus Newport. Marksville aud Natural Bridge, Va.; L 

 M. Underwood. 



Indiana University, December 1, 1888. 



