30 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Yellow; slender. Joints of antenna; 28. 

 Oeelli few, 13, airauged in •> series. 

 Piosternal teeth 8. 

 Coxal pores 4, 4, 4, 3. 



Spines of tirst pair of feet 1, 2, 1 ; |H'uultiniate 1, 3, 3, 2; last i>air 1, 

 3, 3, 1. 



Length of body 11'"'"; last pair i»f feet 4. o'""'. 



16. Lithobius juveutus, sp. uuv. 



Brown; head and antenme dark, tip of latter fulvous, feet and ven- 

 tral plates i)ale. 



Slender, not smooth ; sparsely julose. 



Head large, subeircular, of nearly equal length anil breadth, nearly 

 smooth; sparsely pilose. 



Antennae moderately long, joints 31. short; rather densely pilose. 



Ocelli 10, arranged in 4 series. 



Prosternal teeth 4, small. 



Coxal pines 4, 4, 4, 3, round. 



Spines of the tirst pair of feet ( ?) 1, 3, 2; penultimate, 1, 3, 3, 1; last 

 1, 3, 3, 1. 



Last pair of feet moderate, not swollen. 



Claw of the female genitalia Avide, short, tripartite, middle lobehmg- 

 est; spines hmg and slender, subequal. 



Length of body 1»'""'; last pair of legs 3.5'""'. 



Habitat. — Bloomington, Ind. 



At tirst this speeies might be taken for the young of mordax. 1 have 

 no young specimens of the latter on hand, but judging from Dr. Meiu- 

 ert's description of a specimen lo.o"'"' long, it can easily be separated 

 by the number of prosternal teeth (4 instead of 10), by the spines of 

 the first iiair of legs (1, 3, 2 instead of 2, 1, 1) and by the number of 

 ocelli. 



Subgenus Eulithobiua Stuxberg.- 



17. Lithobius multidentatus Newport. 



Lithobius multidentatun Newport, Traus. Liuu. t^oc, xix, 365, 1845. 



Brown; varying from a deep mahogany to rather a light yrllowish- 

 brown ; ventral laminje and feet paler ; tij) of antenna;, mouth parts, 

 and the last few joints of the hind legs rufous. 



Eather strongly or moderately robust ; not smooth, more so poste- 

 riorly. 



Head subobcordate, wider than long (C:o), somewhat rough. 



AntenniB short, joints 19-23, mostly long. 



Ocelli numerous, 27-35, arranged in 7-8 series. 



Prosternal teeth 14-18, rather short, stout, conic, not crowded to- 

 gether. 



Coxal pores numerous, large and small, arranged in 3-5 series. 



