1 7Q 



1869.] ^ *^ [Cope. 



distance of not more than three hundred feet from its mouth. Tlie species 

 is small, and all were found together under a stone. Their movements 

 were slow, in considerable contrast to the activity of ordinary Carabidje. 

 Myriapoda are the only articulates which can be readily found in the 

 remote regions of the caves, and they are not very common in a living 

 state. I append a list of these, with their congeners of the outer world, 

 which I collected in the mountainous region. Many of them have been 

 kindly named for one by my friend Dr. H. C. AVood, the author of the 

 Monograph on the American species. 



SCOLOPENDRID^. 



Opisthemega postica, Wood, Journ. Acad. Nat. Sci. 



This species, or a variety of it with the posterior pair of limbs con- 

 siderably stouter than the specimens from North Carolina, described and 

 figured by Wood, is one of the most abundant species in the mountains 

 of soutliAvestern Virginia. It occurs every where under stones, etc., and 

 is very active. Its great peculiarity is the modification of the posterior 

 pair of limbs into a pair of stout jaw-like members, which like the an- 

 terior jaws are used in offence and defense. They seize the finger with 

 them easily, and penetrate the skin with their sharp chitinous points, 

 though not as efl'ectively as with the jaws. . Thus armed at both extremi- 

 ties, they are even less pleasantly handled than the Scolopocryptops s e x- 

 s p i n o s a, which is also common in the same country. An undescribed 

 Scolopocry]3tops, with a green body and reddish head, is also common. 

 LysiopetaliDo^e. Wood, defin. 



The genera of this family appear to the writer to be two, defined as 

 follows : 



Annuli without pores. spirostkephon. 



Annuli with two pores on each side the median line. 



pseudotremia g. n. 



Spirostrephon lactarius, Brandt, Wood Monograph Myriapoda N. 

 A., 192, JuUs lactarius, Say. 

 Not uncommon. 



Pseudotremia cavernarttm, Cope, sp. nov. 



This animal inhabits the deepest recesses of the numerous caves which 

 abound in Southern Virginia, as far as human steps can penetrate. I 

 have not seen it near their mouths, though its eyes are not undeveloped, 

 or smaller than those of many living in the forest. Judging from its re- 

 mains, which one finds under stones, it is an abundant species, though 

 rarely seen by the dim light of a candle even after considerable search. 

 Five specimens only were procured from about a dozen caves. 



Segments twenty-nine, without dorsal keel or groove, but quite convex 

 in antero-posterior section, and somewhat swollen at a dorso-lateral point, 

 forming a slight shoulder and slightly quadrate transverse section. The 

 shoulder becomes much stronger on a few anterior segments. Surface of 

 the annulus rugose, above most so on the shoulders ; laterally to the legs 



