RELATIONS OF INSECTS TO OTHER ARTHROPODA 25 



is added at each moult," and he concludes that the addition of new 

 segments " therefore takes place in this animal by the intercalation 

 of two at each moult between the antepenultimate and penultimate 

 sterna, as in the Chilognatha, and as also in some of the Chilopoda." 

 There is but one family, Scolopendrellidae, and a single genus, 

 Scolopendrella, which seems to be, like other archaic types, cosmo- 

 politan in its distribution. 



Our commonest species is 8. immaculata Newport, which occurs from Massa- 

 chusetts to Cordova, Mexico, and in Europe from England to the Mediterranean 

 and Russia ; Mr. 0. F. Cook tells me he has found a species in Liberia, West 

 Africa. The other species are S. notacantha Gervais, Europe and Eastern 

 United States ; S. nivea Scopoli (S. gratice Ryder), Europe and United States; 

 S. latipes Scudder, Massachusetts. 



LITERATURE ON SCOLOPENDRELLA 



Newport, George. Monograph of the class Myriopoda, order Chilopoda. (Trans. 



Linn. Soc. xix, pp. 349-439, 1 PL, 1845.) 

 Menge, A. Myriapoden der Umgegend von Danzig. (Neuste Schriften der 



naturforsch. Gesell. Danzig, iv, 1851.) 

 Ryder, John H. Scolopendrella as the type of a new order of articulates 



(Symphyla). (Amer. Nat., May, 1880, xiv, pp. 375, 376.) 



The structure, affinities, and species of Scolopendrella. (Proc. Acad. 



Nat. Soc. Phil., pp. 79-86, 1881, 2 Figs.) 



Packard, A. S. Scolopendrella and its position in nature. (Amer. Nat., 1881, 



pp. 698-704, Fig.) 

 Muhr, Jos. Die Mundtheile von Scolopendrella und Polyzonium. Prag, 1882, 



1 PI. 

 Mason, J. Wood. Morphological notes bearing on the origin of insects. (Trans. 



Ent. Soc. London, 1879, pp. 145-167, Figs.) 



Notes on the structure, postembryonic development, and systematic 



. position of Scolopendrella. (Ann. and Mag. Nat. Hist., July, 1883, 



pp. 53-63.) 

 Latzel, Robert. Die Myriapoden der osterreichisch-ungarischen Monarchic, ii, 



Wien, 1884, pp. 1-39, Pis. 

 Haase, Erich. Die Abdominalanhange der Insekten niit Beriicksichtigung der 



Myriapoden. (Morph. Jahrbuch, xv, pp. 331-435, 2 Pis., 1889.) 

 Schmidt, Peter. Beitrage zur Kenntnis der niederen Myriapoden. (Zeits. f. 



wissen. Zool., lix, pp. 436-510, 2 Pis., 1895.) 



