ACADEMY OF SCIENCES. 133 



series, vol. XIII, pp. 137-248,) he however, after continued study and with 

 access to the necessary material, somewhat modified his former ideas of the 

 N. American Lithobii, as can be seen by a comparison between the species 

 mentioned in his two different works of the years 1865 and 1863. 



(Genus LITHOBIUS, Wood.; 



1865. 1863. 



L. Americanus = ( L. multidentatus. 



| L. Americanus. 



L. transmarinus. 



L. mordax. 



L.paucidens = L. paucidens. 



L. planus = L. planus. 



(Genus BOTHROPOLYS, Wood.) 



B. multidentatus = B. nobilis. 



B. Xanti = B. Xanti. 



B. bipunctatus = B. bipunctatus. 



Two years later or in 1867, we find mentioned also by Wood another species 

 L. bilabiatus, from Illinois, "Notes on a collection of California Myriapoda, 

 with the description of new eastern species," (Proced. Acad. Nat. Science of 

 Philada. 1867, pp. 127-130.) 



Finally, during the last years, the following species of Lithobii not previ- 

 ously known have been added to our knowledge of the myriapod fauna of 

 North America: 



(a.) Of Alois Furnbert and H. de Saussure, 1869, ("Myriapoda Nord 

 Americana." Revue et Magasin de Zoologie, 2: me serie, vol. XXI, pp. 149- 

 159.) L. aztecus, L. fnystecus and L. toltecus, all from Mexico. 



(b.) Of Fr. Meinert, 1872, ("Myriapoda Musei trauniengis, II Lithobiini : " 

 Nat. Tidsskrift, 3:R., 8:Bind, pp. 281-344) L. vorax, from 1/ouisiana. 



(c.) Of O. Harger, 1872, ("Descriptions of New 'N. American Myrio- 

 pods: " Am. Journal of Sc. and Art, 3d series, vol. IV, pp. 117-121,) L. pine- 

 torum, from Oregon; and lastly 



(d.) By the author of this paper, 1875 ("Nya N. Americanska Lithobier " 

 — Ofvers. Kgl. Vet. Acad., Fish, aig 32 pp., 65-72). L. monticola, L. pusio, L. 

 paradoxus, L. obesus, L. kochii, L. megaloporus, L. eucnemis, L. saussurei and 

 Lamyctes fulvicom is. 



Such is, in short, the historical development of our knowledge of the Lith- 

 obii of the N. American continent. Their number— very small, certainly, in 

 comparison with what is known from Europe — does not exceed twenty-four, 

 considering L. spinipes, Say, to be identical with L. americanus, Newport. 

 The following is an abstract from a more extensive work, now in preparation, 

 a preliminary report with synonymy of all hitherto known species. 



Of the following species I know personally fourteen, or 2, 3, 5, 7, 8, 10, 13, 

 14, 16, 18, 19, 20, 21, 24. A very rich material, carefully collected and pre- 



