THE MYRIAPODA OF NORTH AMERICA. 151 



This species, the type of the genus ticytonotus, is identical with the 

 Polydesmus (/ntiiulfttuN of Say. 



6. Scytonotus laevicollis Koch. Syst. Myr., 131, 1847 (Xnrtli America); Die Myr.. 

 ii. 41, pi. 80, fig. 163, 1863. 



The only differences Koch makes between this and the preceding 

 species is in the number of rows of scale-like tnbercules on the first 

 dorsal plate, one instead of thnr. This character is utterly worthless, 

 as the scales on the first dorsal plate vary in number and are sometimes 

 almost obliterated. On account of this variation his la'ricoUi* is the 

 same as suabricoUis, and hence identical with Say's ( 



7. Scytonotus iiodulosus Koch. Syst. Myr., 131, 1847 (Pcnii-ti/lriinin ) ; Die Myr., 



n, 43, pi. 80, lit;-. liU. 1863. 



This species, which seems to be valid, bears, in its general appearance, 

 a resemblance to Polydesmus, but the position of the repugnatorial pore 

 excludes it from that genus. It can not be the Scytonotu* sfti(/cr of 

 Wood, because the latter species has the squamation more like that of 

 firanulatHs, and not as in Polydesmus, His figures of the first dorsal 

 plate do not agree in regard to the position of the anterior row of tuber- 

 cnles; one shows them along and inside the anterior margin, as no doubt 

 they are, while the other represents them as placed on the margin and 



appearing as sharp and deep serrations. 







8. Polydesmus laucescens Koch. Syst. Myr., 133, 1847 (Xortli .Imfrii-a) ; Die Myr., 



i, 59, pi. 26, fig. 51, 1863. 



This is identical with the Poly(h'*mux serrafus of Say. 



9. Polydesmus pennsylvanicus Koch. Syst. Myr., 133, 1847 i . /'' mixi/lrtinia); 



Die Myr., n, 18, pi. 69, fig. 142, 1863. 



Probably identical with sermtH*. It differs in having four scale-like 

 tubercules in the first row. Koch may have drawn his figure from one 

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

 of scales. On the ultimate segments of .svrm///.v there is occasionally a 

 tendency for four scales in the first row. 



r<-nHnyh'(tiii<-ti* can not be the same as /'. bt-diincri Bollman, for the 

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

 Italian authors have recorded specimens of pennsylvanicus from northern 

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



10. Polydesimis moiiiliaris Koch. Syst. Myr., 1 :!.">, 1M7 ( I'<ii>ixi/lrtnii<t ) ; Die Mvr., 



II, 20. pi. 69, lig. 113. 1S63. 



A valid species. It is the same as the Polydesmus serratus of Wood. 



11. Euryurus maculatus Koch. Syst. .Myr.. i:ix. is 17 i/ Iil>i1<it)\ Die M\i.. i. 7. pi. 



3, ti.i;-. N. tst;:;. 



According to Peters, who has probably examined the type specimen. 

 macidntux is the same as Ennjin-nx <'i-i/tl/i'<>/>ii</i;s \ Ilrandt i. In this 

 view he seems to be correct, for lean find QO difference between the de- 

 scription of M<-nltnN and specimens of < 



