On the Genera and Species of the Order Pauropoda. 
By 
H. J. Hansen. 
With Plates I—VI. 
I. Historical Notes. 
In 1867 sir JohnLubbock published his well-known paper: 
On Pauropus, a New Type of Centipede (Trans. Linn. Soc. Vol. 
XXVI, p. 181—190, Pl. X). He described and figured two Eng- 
lish species of the new genus, furthermore he correctly pronounced 
that the type ,,;must certainly constitute a new family, Pauropo- 
didæ, and, I think, even a new order, which might perhaps be 
called Pauropoda". The author represents both species so that I 
have been able to distinguish "them from several other European 
forms; he points out many essential features, discusses the syste- 
matic position, describes the youngest stage, mentions briefly the 
other stages and communicates biological observations. The very 
valuable paper has been quoted by most Zoologists who have written 
on the order, and I do not think it necessary to give a more spe- 
Cial extract of its contents. 
In 1871 A. S. Packard published (Proe. Boston Soc. Nat. 
Hist. Vol. XIII, p. 409; Amer. Naturalist, Vol. IV, p. 621) a quite 
insufficient description of a new species of Pauropus captured at 
Salem, Mass. — In 1879 J. A. Ryder described (Amer. Natur., 
Vol. XIII, p. 603—12, with figures in the text and one plate; 
Proc. Acad. Nat. Sc. Philadelphia, 1879, p. 139 and 164) a very 
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