24 BULLETIN 46, UNITED .STATES NATIONAL MIISEKM. 



]H'('uliar knobs in both male and feiiiali'; male, the end of the third 

 joints proibiced into a short, bhmt lobe, which is surmounted with 4 

 spines, tlie basal third of the fourth Joint proihued into a hir};e, fiat, 

 outward (airvinj; lobe, about .i""" lonji;, the end with a row of bristles, 

 the en<l of the sanu' joint produced into a small, sharp, outward pointing 

 lobe; female, the en<l of third joint swollen, pilose, als»> two large spines, 

 base of fourth joint produced into a cylindrical lobe, directed forwards, 

 pilose, a little shorter than in the male, the end of the same joint swollen 

 oil the inner side. 



Claw of the female genitalia wide, tripartite; spines st<mt, subequal. 



Length of body 1()-15"""; last pair of legs 4-.'»'""'. 



Habitat. — lUoomington, Ind., and Rock Island, 111. 



The above description was taken from a male and female from the 

 former locality. I have also sent a male to the collectiou of Dr. Anton 

 Stuxberg, of Goteborg, Sweden, under the name of L. hilabiatus. Dr. 

 Wood, in his description of Lithohius bilabiatm, has included two 

 8|>ecies. I have restricted hilabiatus to the one having the ordinary 

 type of hind legs; the other I have described as a new species — Litho- 

 hiuH tuber. 



5. Lithobius proridens, sp. no v. 



Yellow-brown ; antennje, feet, and ventral lamiiiio pale. 



Slender, smooth, s])arsely pilose; ventral lamiuic more tlensely pilose 

 iiosteriorly. 



Head obcordate, of alumt eijual length and breadth (.'►: 2. a), smooth, 

 sparsely pilose. 



Antenuie moderate, joints 24-2J), short; rather densely i)ilose. 



Ocelli sometimes indistinct and irregular, 8-15, arranged in 4-<» series. 



i'rosternal teeth 10-12, small, not crowded together. 



Coxal pores .'i, 4, 4, 3-4, G, 5, 5 large and round. 



Spines of the first i)air of feet 2, 3, 1-3, 3, 2; penultimate 1, 3, 3, 1-1, 

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



Posterior pair of feet long, not swollen. 



Claw of the female genitalia long and slender, whole; spines mod- 

 erate, subequal. 



Length of body 10-12""" ; last pair of legs 4-.">""". 



Habitat. — Bloomiugton, Ind. 



This species is common under leaves, etc. 



The, following is the description of a specimen a""" long. 



Antennai short, joints 21. Prosternal teeth 10. 



Ocelli distinct, 1, 2, 1. Coxal pores, 1, 1, 1, 1. 



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

 1, 3, 3, 1. 



6. Lithobius puUus, sp. iiov. 



Brown; head darkest, feet j.nd ventral lamiiiic pale; tip of antennj» 

 and prehensorial feet chestnut. 



