R E F' ^ C E . 
This volume is fourth aud last of a desej'iptive catalogue of the fishes 
and lish-like vertehrates of North aud IMiddle America. Part I, Branrhinn- 
tom(Ui(l<r to Prlamiiihidiv inclusive (pp. 1 to 1240), was jmhlished C)ctoher 
2, 189(1; Part T I, Lutin)il<hr to 0'p//rd/cmd///d,r inclusive (pp. 1241 to 218.4) , 
Avas pul)lisheil Octoher 4, 1898; Part III, CnUionymiiLv to f)tjcnccphaU<lx 
inclusive, including also “Addenda,” an “Artificial Key to the Families 
of the True Fishes,” a “(dossary of Technical Terms,” and an “Index” 
(•(.mqOete for Parts 1, 1 1, and III (pji. 2184fr to 414(1) , was published Novem- 
ber 28, 1898; and Part IV, the present volume, api)earsj on June 2(1, 1900. 
Since the publication of Part III, investigations by Dr. .Iordan, in ]Mex- 
ico, ami by Dr. Fvermann, in Puerto Pico, have added greatly to our 
knowledge of the fishes of those irgions, and have mad(> it desirable to 
incor])orate in tlu^ present volume still further addenda. 
Pecent studies by Dr. (liinther, (jf certain Limiican types, show that 
some changes in nomenclature are necessary, whicli are also inclmU'd. 
D.vvin Staer Jordax. 
P>ARTOx Warren Evekmanx. 
Lelaxd Stanford .Junior Universita', 
Palo Alto, Santa Clara Counta', California. 
March 15, 1900. 
(Ill) 
