THK MYRIAPoDA UF NOKTH AMKKICA. 151 



This spocios, the typo of tlio jjiMiiis Srtffonofns, is icloiitical with the 

 PolydrMniKH tfronfdfitns of Say. 



6. Scytoiiotus laevicollis Kocli. Syst. Myr., I'M, 1847 (Xnrih Amerira); Die Myr., 



II, 11, i>l. Ko. lijr. l6.^. 1803. 

 The only dirterenecs Koch makes between this and the |ae»'e«liiij> 

 species is in the iiuiiiber of rows of scah'like tiilu'icuh's on tiic liist 

 dorsal phite, one instead of tlircr. Tiiis character is utterly worthless, 

 as the scales on the tirst doisal plate vary in number and are sometimes 

 almost obliterated. On account of this variation his hcrirollis is the 

 same as scabrivollis, and hence identical with Say's f/raniilaftis. 



7. Scytonotus nodulosus Koch. Syst. Myr., 131, 1817 (Pennxiflranid); Itic Myr., 



II, 13, pi. 80, lijr. ItU. 18<;3. 



This species, which .seems to be valid, bears, in its freuorij] ap])eai ain-e, 

 a resemblance to AW//</«i«WM.s, but the position of tin* repuj^iiatorial pore 

 excludes it from that f^enus. It can not be the IScyfonotus aetUjcr ot 

 Wood, becau.se the latter species has the S(|uamation more like that of 

 ///Y<»/^/^f^//.<?, and not as in I'nhfdrfimHs. His fi^nres of the first dorsal 

 plate «lo not a<»ree in refjaid to tlu^ position of the anterior row of tiiber- 

 cules; one shows tliem alouft" and inside the anterior mar.uin, as no doubt 

 they are, wliile tin' other represents them as ])]aced on the margin and 

 appearing as sharp and dee}) serrations. 



8. Polydesmus glaucescens Koch. Syst. Myr., 133, 1817 ( Xorth Amrr'na ) : Die Myr., 



I, ."iil, pi. 26, tig. 51, 18(53. 



This is identical with the PoUfdexnuis serratns of Say. 



9. Polydesmus pennsylvanicus Koch. Syst. Myr., 133, 1847 ( ronmylrdHia); 



Die Myr., ii, 18, pi. ($9. tig. 142, 1863. 



Probably identical with srrratxs. It ditlers in having" four .scale-like 

 tubercules in the tirst row. Koch may have diawn liis ligure from one 

 of the ultimate segments, and this will account for the larger number 

 of .scales. On the ultimate segments of nerratxs there is occasioiiall}' a 

 tendency for four scales in the first row. 



PennsyWanicuH can not be the same as i*. hmmieri Bolbnan. tor tlie 

 latter has so far only been found in the Tennessee mountains. Several 

 Italian authors have recorded specimens oi pen nsj/J ran i<ii.sl\oui northern 

 Italy, but this is no doubt due to an erroneous identification. 



10. Polydesmus moniliaris Koch. Syst. Myr., K^i, 1847 (/V»»»s///*«;/;f» j ; Die Myr., 



II, 20. pi. 69, fig. 143, 1863. 



A valid species. It is the same as the Poli/desnins fierratns of Wood. 



11. Euryurus maculatus Koch. Syst. Myr., 138,1847 (fhahifat); Die Myr.. i. 7. pi. 



3, lig. 8, 1863. 



According to Peters, who has probably examined the type sj^ecimen, 

 mavulntus is the same as EnryuruH cryikropyijuH (Brandt). In this 

 view he seems to be correct, for I can find no dirtV'ience between the de- 

 scription of maculatua and specimens of erythr«q}yyii.s. 



