134 lULLKTIN 46, UNITKD STATES NATIONAL Ml^SKl'M. 



than \ouii (•^■•7). Aiitoiina' iiuMh'rat*', joints 2.V20. joints sliort, i-ather 

 deiisriy Iiirsnte. Ocelli 0-12, in 4 or") series. l'ro>ternal teetli 10 or 12, 

 ratlnT small ami not sharp. Coxa* pores l,r),r),4 or ;>,4,4,;J, roun«l. 

 Spines of the tirst i)air of feet 2,2,1 ; ]>ennltiMiate pair l..{..»,2 or 1,.">,2.1; 

 last i>aii- 1,.},'{,2 or l,.'i,"»,I. Posterior feet moderate. Claw of the 

 female {genitalia whole, rather lonj^ and slender; sjiines rather lonji' and 

 shMnler. of iibont equal lenjjth. Lenjjth of body, Li"""; breadth, l.S""". 



Habitat. — l>loominj;ton. Indiana. 



This s])eeies is common under leaves on wooded hillsides; it belonjis 

 to the sub^^enus ArvhUithohiiiH. 



8. Lithobius cardinalis. 



[lAthiihiuH carditKilix Dollmaii. Am. Nat., xxi, 81 (1887). | 

 Brown, ventral lamina' and feet ])aler; hea<l fulvous brown, antenna* 

 darkest, tip rufous; rather slender, smoc)th, very sjjarsely i)ilose, feet 

 sparsely; ce])halic lanuna' snbeircular, wider than lon<j^ ("•^'); antenuie 

 nv'derati', joints 2S, small, rather densely hirsute throujihout: ocelli 10, 

 in 4 oi- r» series; prosternal teeth 4. rather lar<ie; coxa- pores .'i.4,4,.'}, 

 round; spines of the tirst i)air of feet 0,2,1; penultimate 1,.>,.»,1; last 

 1,.'i,.'),l; ])Osterior feet rather long; claw of the female genitalia trii)ar- 

 tite, short and stout; spines robust, sharp, interior shortest. Length of 

 body, S"""; breadth, 1""". 



Habitat — Bloomington, Indiana. 



This sjiecaes is common; I have taken it most abundantly under 

 boards laid on a thick growth of grass in March and April. It behmgs 

 to the subgeiuis Arckilithobiiis. 



9. Lithobius pullus. 



[LUhohinn piillnn liollinan. Am. Nat., xxi, 81 flSST).] 



Brown, head darkest, feet and ventral lamnne i)aler; feet si»arsely 

 hiisute; cephalic lamina sub([uadrate, longei' than wide (11 : 10). An- 

 tenna* moderate, joints 2(), not very short, moderately i)ilose. C)(!elli 

 9-12, in four series. Prosternal teeth 4, nuKlerate. Coxje pores .5,4, 

 4,3, round. S])ines of the tirst pair of legs 1,2,1; penultimate 1,3,2,1; 

 last 1,3,3,1. Posterior feet moderate. Claw of the female genitalia 

 trii)artite, the inner lobe larger than the other, spines rather robust, 

 sharp, the inner smallest; in one specimen there are three on one side. 

 Length of body, lO"""; breadth, 1""". 



Habitat. — Bloomington, Indiana. 



This species belongs to the subgenus Archilithobius, and is described 

 from nine specimens. 



10. Lithobins trilobus. 



[^TJthnhiits tnlohnu Bolhuau. Am- Nat., XXI, 81 (1887).] 



Brown, head light mahogany, feet and ventral lamiuie pale; feet 

 sparsely i)ilose and also the last ventral lamiuje, cephalic lamina sub- 

 cordate, broader than long (7 : 6). Antenme moderate, joints 20, mostly 



