Evermann aivl KenddU — Fish from Central Ecuador. 95 



Since the publication of Eigenmann's South American 

 Neniatognatlii, Boulenger writes : * 



Leaving aside the two or three species in which a spine is present 

 between the rayed dorsal fin and the caudal, whether ex])osed and sup- 

 porting the small adipose fin or ]«irtly imbedded in the skin, and for 

 whic^h the name Sliigognicx Giinthei" may be retained, I find upon exami- 

 nation of the material in the British Museum, and after perusal of Dr. 

 Steindachner's descriptions, that as many as six species of the genus Arges 

 are entitled to distinction. 



He further says : 



A. longifilin, sabalo, taczanowskii, and peruanus inhabit the Andes of Peru, 

 A. prenodilla and why inperi the Andes of Ecuador. I had originally con- 

 founded the two latter species, when Mr. Whymper submitted to me his 

 specimens for identification some years since, but renewed examination 

 has convinced me that there are at least three kinds of "Prenadillas" in 

 Ecuador, instead of one as believed by Putman. 



He then retains Stygogenes Giinther instead of Cydopium 

 Swainson for the form with the spine on the caudal peduncle, 

 and Arges for the one with no spine and more or less of an 



adipose tin. " Our specimens belong to the first named group. 

 Arges tvhymperi is doubtless an individual variation of Cydopium 

 cydopum as indicated by our specimens, since they show that 

 the presence or absence of a spine is not even a specific differ- 

 ence. A. tvhymperi has no adipose fin and no spine. A. tac- 

 zanoioskii possesses a low fleshy fold which is supposed by the 

 authors to be an adipose fin, and has no spine, and represents 

 the sahalo group of Peru. 



In 1898 Boulenger described a species from Ecuador,! under 

 the name Arges festse, which appears to be valid. In the same 

 paper he redescri}:)es A. prevadilla, regarding which he wrote 

 that the examples confirmed the identity, recognized by Stein- 

 dachner, of Brontes pi'enadUla C. & V. and Arges hrarhycephalus 

 Giinther. 



Regan (1. c.) has recently made radical changes in the classi- 

 fication of this Siluroid group and described a number of new 

 species. He oljjects to the family name Argidse of Gill and 



* Description of two new species of the Siluroid Genus Arges, Proc. Zool. Soe. London 

 1890, 4.30 to 452, and plate. 



t Poissons de Fequateur Boll, du Mus. Zool. ed Anat. Comp. R. Univ. Torino, XIII, 

 No. 329, 1898, PI. XXI, Fig. 7. 



