354 CRAYFISHES. 
It differs from both of these species in its short and broad areola. Compared 
with P. nicoleti, it differs in the lack of sculpture of the chela and carpus. Com- 
pared with P. hassleri, 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 
Muséum 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. pl. 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 suleato, margine superiore grosse tuberculato; mano crassa 
subtus rotundata; digitis haud lineato-sulcatis, intus basi longe barbato-ciliatis. 
In 1894 Philippi! published 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 (Proce. U. 8. 
Nat. Mus., 1898, 20, p. 690). 
PARASTACUS SPINIFRONS (Philippi). 
Plate 9, Fig. 1. 
Astacus spinifrons Puitrppi, 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, 
1 Dos Palabras sobre la Sinonimia de los Crustdceos, Dec4podos, Braquiuros 0 Jaivas de Chile. 
Anales Universidad Chile, 1894, 87, p. 369-379. I have been unable to consult 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. 
