PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 527 



4. Ps. vuDii Cope, loc. cit., p. 180; Packard, Am. Nat., v, pp. 748, 7-kd, 



1871; Harger, loc. cit., pp. 118, 119. 

 Habitat. — ? Moutgomery County, Virginia. 

 Length 11 lines. 



5. Spieostrephon (Pseudotremia) copei Packard, Am. Nat., v, pp. 



718, 719, 1871. — Scoterpcs co/jeiCope, Am. Nat., vi, p. 409, genus Sco- 

 terpes proposed and defined p. 414; Harger, loc. cit., pp. 118, 119; 

 Packard, Zoology, pp. 35G, 357. 



Habitat. — Mammoth Cave, Kentucky. 



Length .35 inch. 



Trichopetalum Harger, Am. Jour. Sci., iv, p. 118, pi. ii, 1872. 



6. T. LUNATUM Harger, loc. cit., p. 119; Eyder, Am. Nat., xiv, p. 37G, 



1880. 

 Habitat. — New Haven, Conn., and Philadelphia, Pa. 

 Length 6""". 



7. T. GL0]MERATU3i Harger, loc. cit., p. 120. 

 Habitat. — John Day Eiver, Oregon. 

 Length 10"'-. 



8. T. JULOIDES Harger, loc. cit., p. 120. 



Habitat. — Simmons' Harbor, north shore Lake Superior. (Smith.) 

 Length 8 """. 



The ninth American species, described below, is the third form of 

 Lysiopetalid which is known to inhabit caves, and the only one beside 

 the species which stands fifth in the above list which is totally blind. I 

 name the species for Dr. C. A. White, United States paleontologist. It 

 is a hairy form, like the four preceding, and will, no doubt, with those 

 constitute a pretty homogeneous group. 



ZYGONOPITS,* nov. gen. 



Cliar. gen. — Sixth pair of legs very robust and with the third joint 

 greatly swollen (a unique feature amongst My riapods, 

 and one which, like the claspers and intromittent 

 organ of Branchii)ods, is to be regarded as a second- 

 ary sexual character, and of value in the character- 

 ization of a genus). 



9. Zygonopus whitei, n. sp. 



Cliar. specif. — Head with short, dense hairs. No 

 eyes, but there is a well-marked depression, or rather 

 vertical excavation, extending from the end of the la- 

 brum to behind and above the insertion of theantenniie. 

 Behind the antenna? the head is much swollen, owing rig. i. Front view of 

 to the outwardly bulging basal pieces of the jaws; Tig""'. swoiJeuGth leg 

 labrum emarginate inferiorly; epicranium emargin- '"^i^ig.T Normal leg. 

 ate behind to receive the anterior semicircular margin of the first 

 * From livybg, a yoke, pair ; yove, that which generates ; and irovg, foot (leg). 



