452 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii 



2. PYGOSTEUS TYMENSIS (Nikolsky). 



G'asterosteus ttpneni^is Nikolh-ky, Mem. Acad. 8ci. I'etersburg, LX, 1889, [). 298 



(Sakhalin Island, Tymi River, Nos. 6593-5). 

 Pygosteus widecimalis Jordan and Stares, Proc. U. S. Nat. Mus., XXVI, 1902, 



p. 62, lig. (Chitose in Hokkaido). 



Our specimens from Sakhalin (Nos. 6593-6595) differ in no respect 

 from the Japanese. Dorsal spines XI-XII. This species differs 

 from^. pungitius in having verj^ short dorsal and ventral spines and a 

 much feebler keel on the caudal peduncle. The exterior processes of 

 the pubic bone are only slightly developed. As remarks Nikolsky " 

 P. tymenms is allied to an "abnormal variety of P. pungitius^'''' 

 described by F. Day'' from Ireland as having a badly marked keel on 

 the side of the tail, and ventral spines lacking or very small. 



3. PYGOSTEUS SINENSIS (Guichenot). 



GaMerosteus sinensis (j!Vicii^^OT,^o\i\.ArL-\\. Mus. Hist. Nat. Paris, V, 1869, p. 204, 



pi. xir, fig. 4 (China, Yang-tse-Kiang? a small specimen, 35 mm. ).— Satv- 



AGE, Nouv. Arch. Mus. Hist. Nat. Paris, X, 1874, p. 33 (same specimen). 

 Gasterosleus japonicus Steindachner, Sitzber. Ac. Wien, mat.-nat. CI., LXXXII, 



1880, p. 264, pl. Ill, fig. 2 (Gulf of Strielok, near Vladivostok). 

 Gasterosterts bussei Warpachowski in Herzenstein and L. Warpachowski, Trud. 



Soc. Natur. Petersburg, XIX, 1887, pp. 13, 54, fig. 1 (Lefu River, trilmtary 



of Khanka Lake, basin of Amur; No. 7100). 

 Pygosteus steindachneri Jordan and Synder, Proc. U. S. Nat. Mus., XXVII, 



1901, J). 747, after Steindachner. — Jordan and Starrs, Proc. V. S. Nat. Mus., 



XXVI, 1902, p. 61 (Tokyo, Aomori, Yamashiro). 

 Pygosteus sinensis Jokdan and Starks, Proc. U. S. Nat. Mus., XXVIII, 1905, 



p. 203 (Gensan). 



We have specimens from Lefu River, a tributary of Khanka Lake 

 (No. 7100 coll., Pleske), from Ussuri CNo. 13761 coll., Paltschewsky), 

 Da-chu-ang, tributary of Sungari (No. 13799 coll., Mjachkow), (xulf 

 of Ussuri, near Vladivostok (No. 13800 coll., Paltschewsk}^), Amur 

 River at Kalgho (No. 2363a coll., SchrenkV Hakodate (No. 2368 

 coll., Maximovicz). This species differs from P. pungitius only in 

 having the sides of the body mailed; but the more recently described 

 P. sinensis woss7iesse7is1i-yi from Kamchatka with very reduced lateral 

 armature connects P. sinensis with P. pungitius. More abundant 

 material would permit us, I think, to accept P. sinensis as a mailed 

 variety of P. 2i>ungitius. The form of the lateral processes of the 

 pubic bone is subject to much variation even in specimens from the 

 same locality. The length of the dorsal and ventral spines depends on 

 the age of the individual; in adults, spines are shorter while in young 

 ones they are longer (see table). 



«Mem. Acad. Sci. Petersburg, LX, 1889, p. 293. 



''F. Day, Fishes of (Jreat Britain and Ireland, 1, 1880-84, i>. 245, pl. lxviii, fig. 4. 



