K0.1136. onSEnVATTOXS OX THE ASTACID^Ti—FJXOK. 665 



White, in his " List of the Specimens of Crustacea in the Collection 

 of the British Museum," 1847, page 71, gives '■'■ Potamohius europwus 

 Leach, Edin. Eue." as a synonym o( Astacus Jiuviatiiis. This seems to 

 be an error. Leach's article, "Crustaceology," in the seventh volume 

 of the Edinburgh Encyclopu'dia, was published in 1814. The Europeau 

 crayfish is there called Astacus Jiuviatilis; the name Potamohiiis 

 europcvus does not appear. 



Subgenus CAMBAROIDES Faxon. 

 Cambaro'ides Faxon, Pioc. Amer. Acad. Arts and Sci., XX, p. 1.^0, 1884. 

 Type, Astaciifi Japoiiicus De Haan. 



ASTACUS (CAMBAROIDES) SIMILIS Koelbel. 



Astacus (Camharo'idcs) similis Koklhkl, Anzeiger d. kais. Akad. d. Wissonsrb. in 

 VVien, math.-naturw. Classe, 29ter .tahrg., 1892, pp. 176, 177; .Sitzunys- 

 berichte, CI, Pt. 1, 1892, pp. 650-656, ligs. 1, 2, 4, 5, 7-11. 



There are three specimens (two males, one female) of this species in 

 the United States National Museum, collected by P. L. Jouy near 

 Fusan, and at Seoul, Korea; KoelbeFs si)ecimens came from the Prov- 

 ince of Kjong-Kwi-do, Korea. 



The Korean crayfish is exceedingly close to Astacus japonicns. The 

 only constant differences appear to be these: In A.japonicns the ros- 

 trum terminates in a minute horny denticle, and the lateral margin 

 bears a similar denticle' on each side, a little way behind the apex, 

 while in A. similis the lateral denticles are wanting. The fingers of ^. 

 japonicus are a little shorter than those of A. similis and there is some 

 difference in the form of the first pair of abdominal appendages (See Plate 

 X, fig. 10, of my "Revision of the Astacid;e" and figs. 8, 9 of Koelbel). 

 The other differences pointed out by Koelbel are not constant; the 

 median rostral carina is more pronounced in two of the specimens of 

 A. simiiis in the jSTational Museum than in any of the nine specimens of 

 A.japoniciis that I have seen, and in one of the three Korean specimens 

 the spine on the inner branch of the sixth abdominal appendage is as 

 far removed from the margin as it is in A. japonicus. 



In two of the examples in the United States National IMuscum 

 (including the largest one of the three) the rostrum is shorter than the 

 antennal peduncle. 



Subgenus ASTACUS. 

 ASTACUS KLAMATHENSIS Stimpson. 



Klamath River, Siskiyou County, California; Umatilla River, Pendle- 

 ton, Oregon; Hangman Creek, Tekoa, Washington; Dart's iNIill, Little 

 Spokane River, Washington; Canird'AleneLake, Idaho (Coll. U.S.N.M.). 



Specimens from the Walla Walla River at Wallula, W^ashiugton, and 



' According to Koelbel (Sitzuugsber. d. kais. Akad. d. Wissenscb. in Wien, CI, Pt. 1, 

 p. 651, lig. 3) tbero are two denticles on eacb side of tbe rostrum in some specimens of 

 A. japonicus. 



