524 PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



I.JIST OF TME NORTH AMIEROCAX SPECIES OF MVRIAlPOI>S BELOIVG- 



INtJ TO TJBE FAMBI.Y OF THE I^lf (>»aOfi»ETA]LHB5.E, "%VDTI3 A BE- 

 SCRIPTflOIV OF A BLBIVIJ FORM FROM 1.17RAY CAVE, VflRCiEIVBA. 



By JOIIJ^ A. RYI>EK. 



Witliout specimens of eacli of the species identified bj' the authors 

 who have described them, the Avriter finds himself quite enable to make 

 a greatly needed revision of this group. The sexual api)endages have 

 not been described in Spirostreplion cmsioannulatus Wood, tV. co^ei Pack- 

 ard, or fS. vudii and S. cavcrnartim Cope. In the cases of the two last, 

 Professor Cope, who described them in 1809, at first thought that they 

 were provided with two pairs of lateral pores to each segment, and in 

 the belief that Spirostreplion had no lateral i^ores he proposed the genus 

 Pseudotremia. He afterwards seemed to agree with Packard that the 

 last-named genus was not valid, and appears to have considered the 

 P. cavernarum a Spirostrephon, as he adopts the last name as its genus 

 in his jiaper on the Wyandotte Cave fauna, which he published in the 

 American Naturalist in July, 1872. His princiijal reasons for this step 

 seem to have been the foregoing, and that the* species was not hairy and 

 was furnished with well-developed triangular eye-patches. '• The allied 

 form found hy Mr. Cooke in the Mammoth Cave has been described by 

 Dr. Packard as SpirostrcpJwn copei.^'' And, Professor Cope continues, 

 "It is eyeless, and is, on this account alone, worthy of being distin- 

 guished generically from Spirostrephon, though the absence of pores, 

 asserted by Dr. Packard, would also constitute another character. Spi- 

 rostrcplion possesses a series of lateral pores, as I have pointed out in 

 accordance with Wood's view." At this point Professor Cope refers to 

 a paper b}' himself in the Proceedings of the ximerican Entomological 

 Society for 1870, where, in a foot-note, he says : " I must correct ray 

 character 'no lateral pores' for Spirostrephon (Proc. Am. Phil. Soc;, 

 1809, J). 179) to one series of pores'." He then proposes the genus 

 Scoterpes for Packard's Spirostrephon copei. We are accordingly led to 

 believe that he has abandoned the genus Pseudotremia. But when vv'e 

 come to learn the character of the external generative organs of the 

 forms described by both Cope and Packard, I would be greatly disap- 

 pointed if it was not found necessary to separate S. cavernarntn, ?S. 

 vudii, and ^S*. ccvsioamiulatus Wood from Spirostrephon and refer them to 

 another genus. For it is a very singular fact that, out of eight species 

 of LysiopctaUda' which have been described since the S. laetarius of Say, 

 none are known to have more than 32 or less than 28 segments, while 

 the type species has no less than 59, according to Wood. I am there- 

 fore inclined to believe with Cope that the S. ecvsioannulatus is congen- 

 eric with S. cavernarum and S. vudii, for which the name Pseudotremia 

 would perhaps become available in case they should be found to be dis- 



