No. 402.] REVIEWS OF RECENT LITERATURE. 523 
ZOOLOGY. 
The White-Fish of Lake Chapala. — In 1879 the writer secured 
a single specimen of the famous “ Pescado Blanco,” a delicious 
food fish found in Lake Chapala, in Mexico. This was described 
under the name of Chirostoma estor. It is an atherinoid fish (Sil- 
versides or Pesce-rey), translucent and delicate in substance and 
about a foot in length. Last winter Mr. J. O. Snyder and the 
writer visited this lake and obtained a very large collection of the 
“ Pescado Blanco." On critically examining it we were surprised 
to find that the material contained six distinct species, similar in 
color and appearance but differing in technical characters, and not 
one of them identical with the original Chirostoma estor. Two of 
these six species have been lately described by Dr. G. A. Boulenger 
from specimens taken by Mr. A. C. Buller, ede the names of 
Chirostoma lucius and Chirostoma sphyrena (Ann. Mag. Nat. Hist., 
1900, pp. 54, 55). These names have priority over those printed 
but not yet published by Jordan and Snyder. par 
Evermann on Species and Subspecies. — In Science for March 
23, Dr. B. W. Evermann gives a very sane and accurate account of 
the formation of species and subspecies, using two species of darters 
in Lake Maxinkuckee as illustrations. He closes with these words: 
“ We sometimes hear the remark that * systematists often go too far 
and describe as new species or subspecies forms which differ but 
slightly from known forms, that they give specific or subspecific 
value to differences which are due merely to slight differences in en- 
vironment. This misses the whole point. What produces species 
and subspecies except slight differences in environment with greater 
or less geographical isolation? And when we see these differences 
why should we refuse to admit their existence or their meaning ? " 
DSI 
Smith on the Fishes of Woods Holl. — In Science for December 
15, Dr. H. M. Smith adds a number of tropical species to the list of 
fishes known from Woods Holl, raising the number of species to 
240, the largest recorded from any Atlantic locality north of Key 
West. The species not hitherto recorded from north of Carolina 
are the following : Murena retifera, Apogon maculatus, Epinephelus 
adscensionis, Garrupa nigrita, Mycteroperca bonace, Mycteroperca inter- 
