354 CRAYFISHES. 



It differs from both of these species in its short and broad areola. Compared 

 with P. nicolcti, it differs in the lack of sculpture of the chela and carpus. Com- 

 pared with P. hasskri, the rostrum is shorter, broader, and more abruptly trun- 

 cate, the chela is rounded above and below and unprovided with the crest-like 

 series of low, squamous tubercles. 



Six species of Parastacus have been previously described from Chile, viz.: — 

 P. chilensis (M. Edw.) in 1837, P. spinifrons (Philippi) in 1882, P. nicoleti (Phi- 

 lippi) in 1882, P. bimaculatus (Philippi) in 1894, P. agassizii Fax. in 1898, and P. 

 hassleri Fax. in 1898. The type of P. chilensis, a single dry specimen, is in the 

 Museum d'Histoire Naturelle in Paris, and should be more fully described, 

 since Milne Edwards's diagnosis (Hist. Nat. Crust., 1837, 2, p. 333) is entirely 

 insufficient. In 1849 (Gay's Hist. Chile, Zool., 3, p. 211, Atlas, 2, Crust, pi. 1, 

 f. 4) Nicolet described and figured as Astacus chilensis M. Edw. a crayfish cer- 

 tainly different from Milne Edwards's species, and R. A. Philippi therefore gave 

 Nicolet's species a new name, Astacus nicoleti, in a paper published in the Anales 

 de la Universidad de Chile, 1882, 61. In a paper published in 1898 when I was 

 ignorant of Philippi's paper, I also gave a name to Nicolet's crayfish, fortunately 

 the same name that had been already given it by Philippi. In the same paper 

 Philippi describes and figures a new species, Astacus spinifrons; the diagnosis is 

 as follows: — A. rostro elongato-triangulari ad basin utrinque spinula acuta; 

 carpo extus profunde sulcato, margine superiore grosse tuberculato; mano crassa 

 subtus rotundata; digitis baud hneato-sulcatis, intus basi longe barbato-ciliatis. 



In 1894 Philippi ' pubUshed a description of another new species of Parasta- 

 cus from Chile under the name of Astacus bimaculatus. This is probably the 

 species which I described later by the name of Parastacus agassizii (Proc. U. S. 

 Nat. Mus., 1898, 20, p. 690). 



Parastacus spinifrons (Philippi). 

 Plate 9, Fig. 1. 

 Aslncus spinifrons Philippi, Anales Univers. Chile, 1882, 61. 



A male Parastacus in the Museum of Natural History, Paris, sent to me for 

 identification by Prof. E. L. Bouvier, I think belongs to this species. It differs, 



' Dos Palabras sobre la Sinoniniia de los Crustdceas, Dccdpodos, Braquiuros o Jaivas de Chile. 

 Anales Universidad Chile, 1S94, 87, p. 369-379. I have been unable to eonsult either of Philippi's 

 memoirs directly. Miss Rathbun, however, has kindly furnished me with a transcript of the earlier one, 

 copied from the volume of the Anales in the Library of Congress, Washington, and Dr. A. E. Ortmann 

 has courteously lent me a MS. copy of the later paper, given to him by F. Philippi, son of the author, 

 about 1900. 



