18b7.1 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 263- 



Ocelli few, 13, arrauged iu 5 series. 

 Prosterual teeth 8. 

 Coxal pores 4, 4, 4, 3. 



Spines of first pair of feet 1, 2, 1 ; peaultiinate 1, 3, 3, 2 ; last pair 1» 

 3,3,1. 

 Length of body ll"^"" ; last pair of feet 4, 5"^". 



16. Lithobius juveutus, sp. nov. 



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

 tral plates pale. 



Slender, not smooth ; sparsely pilose. 



Head large, subcircular, of nearly equal length and breath, nearly 

 smooth ; sparsely pilose. 



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



Ocelli 10, arranged in 4 series. 



Prosternal teeth 4, small. 



Coxal pores 4, 4, 4, 3, round. 



Spines of the first 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 wide, short, tripartite, middle lobe long- 

 est ; spines long and slender, subequal. 



Length of body 9™^" ; last pair of legs 3.5™™. 



Hahifat. — Bloomington, Ind. 



At first this species might be taken for the young of mordax. I have 

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

 ert's description of a specimen 15.5™™ long, it can easily be separated 

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

 first pair of legs (1, 3, 2 instead of 2, 1, 1) and by the number of ocelli. 



Subgenus EuUthobkis Stuxberg. 



17. Lithobius multidentatus Newport. 



Lithohius mulltdcntutKS Newport, Traus. Lian. Soc , xis, 365, 1S45. 



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

 brown ; ventral lamiure and feet paler ; tip of antenna^, mouth parts and 

 the last few joints of the hind legs rufus. 



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

 riorly. 



Head subobcordate, wider than long (6:5), somewhat rough. 

 • Antennte short, joints 19-23, mostly long. 



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



Prosternal teeth 14-18, rather short, stout, conic, not crowed together. 



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



First pair of feet armed with 2, 3, 1-2, 3, 2 spines; penultimate 1, 

 3, 3, 1-1, 3, 3, 2 ; last pair 1, 3, 2, 1-1, 3, 3, 2. 



Last pair of feet long, not swollen. 



