THE MYRIAPODA OF NORTH AMERICA. 151 



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

 Polydesmus granulatus of Say. 



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



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



The only differences Koch makes between this aud the preceding 

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

 dorsal plate, one instead of three. 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 Icevicollis is the 

 same as scabricollis, and hence identical with Say's granulatus. 



7. Scytonotus nodulosus Koch. Syst. Myr., 131, 1817 (Pennsylvania); Die Myr., 



n, 43, pi. 80, fig. 164, 1863. 



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

 a resemblance to Polydesmus, but the position of the repugn atorial pore 

 excludes it from that genus. It can not be the Scytonotus setiger of 

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

 granulatm, aud 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- 

 cules; 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 glaucescens Koch. Syst. Myr., 133, 1847 (North America) ; Die Myr., 



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



This is identical with the Polydesmus serratus of Say. 



9. Polydesmus pennsylvanicus Koch. Syst. Myr., 133, 1847 (Pennsylvania)', 



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



Probably identical with serratus. 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 serratus there is occasionally a 

 tendency for four scales in the first row. 



Pennsylvanicus can not be the same as P. branneri 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. Polydesmus moniliaris Koch. Syst. Myr., 135, 1847 (Pi mnsylvania) ; Die Myr., 



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



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



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



3, fig. 8, 1863. 



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

 maculatus is the same as Euryurus erythropygus (Brandt). In this 

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

 scription of maculatus and specimens of erythropygus. 



