THE MYRIAPODA OF NORTH AMERICA. 79 



31. Lithobius branneri Botlman. 



A single specimen was obtained at Okolona and another at Little 

 Hock. 



32. Lithobius proridens Bollman. 



A few were obtained at Little Rock. One individual is considerably 

 larger than any specimen collected before. 



33. Lithobius pinguis, sp. nov. 



Posterior angles of all the dorsal plates straight. Anal pair of legs 

 armed with two claws. Coxal pores few, in a single series. Penulti- 

 mate pair of legs armed with two claws. Oox;e of the posterior feet 

 unarmed. Dark chestnut brown, head and antenna 1 dark, legs paler. 

 Slender, not smooth, sparsely pilose; head wider than long (3.5:3), 

 polished, not pilose. Antenna 1 short, 22 to 24 jointed, articles short. 

 Ocelli 4 to 6, arranged in 2 or 3 series. Prosternal teeth 2+2. Coxal 

 pores 3, 3, 3, 2 to 4, 4, 4, 4, round. Spines of the first pair of legs 0, 

 0,1; penultimate -pah- 1, 3, 2, 1 to 1, 3, 3, 1; anal pair 1, 3, 2, 0. Pos- 

 terior legs short. Female : Claw of the genitalia entire, stout and much 

 curved; spines strong, subequal. Length of body 9-10""". 



Habitat. — Little Rock. 



This description is based on three specimens. This is the smallest 

 North American species with the claw of the female genitalia entire. 



34. Lithobius celer, sp. nov. 



Posterior angles of the 9, 11, 13 dorsal plates produced. Anal pair 

 of legs armed with one claw. Coxal pores few, in a single series. Pe- 

 nultimate pair of legs armed with two claws. Coxa^ of the 13, 14, 15 

 pairs of feet laterally armed. Brown of various shades, head and legs 

 more or less chestnut, antennae dark. Moderately robust, smooth, 

 sparsely pilose ; head about as long as wide, pilose. Antennae rather 

 long, 30 to 31 jointed, articles small. Ocelli 18 to 40, arranged in 4 to 7 

 series. Prosternal teeth 5 -f 5 to 7 + 7. Coxal pores 2, 3, 3, 2 to 5, 

 6, 6, 5, round. Spines of the first pair of legs 1, 2, 1 to 2, 2, 1; penul- 

 timate pair 1, 3, 3, 1 to 1, 3, 3, 2; anal pair 1, 3, 3, 1 to 1, 3, 3, 2. Pos- 

 terior legs short. Male : Tibia of anal legs somewhat erassate, and fur- 

 rowed beneath; but more furrowed in the female. Female: Claw of 

 the genitalia short, tripartite, middle lobe much longer, others sub- 

 equal; spines moderately slender, inner shortest. Length of body 15- 



OKruni 



Abundant or common throughout the State. 



This species is not strongly related to any known North American 

 species; it should be placed near forficatus, which it seems to replace 

 in Arkansas. 



Dr. Wood has reported forficatiis from Arkansas and he may have 

 had the species which 1 have described. 



