Evermann and Kendall — Fish from Central Ecuador. &3 



The third genus eontaiiis l)iit one species, Adrohlepvs grixalvii 

 HiinihohU. 



The genus Anjoi was erected h^' Cuvier and Vah'neiennes* to 

 inckide those species having hifid teeth and a "long, low adipose 

 fin . " It was distinguislie(l from Brontes l)y the latter's ha\dng no 

 adipose tin. Tlie tirst included Arf/fs s<ih(ilo nnd Arges cydopiiin; 

 the second Brontes prenadUla which ^"alenciennes says is of 

 identical structure in every way witli '.Trr/fs cyclopinn except that 

 it has no adipose tin. He further says regarding the latter : 



They liave shown to me that the fish of M. Boussingault indicates the 

 place that sliould be assigned to AdroJiU'iim. It is, if the term be allow- 

 able, an apodal prnindiUa; and the PimelnduH cydojmm is very probably 

 of the same genus as the salxilo. 



Steindachnev has re-examined the types of Arges sabalo and 

 one of the two type specimens oi Brontes 'prenadilla. Regarding 

 the latti'i- he says : f 



Valenciennes's assertion that an adipose fin before the caudal is lacking, 

 is erroneous, and the figure in I'Histoire Naturelle in plate 4-14 is one of 

 the numerous errors in this work. 



H(; further states that Giinther's Arges hrachyccphalas is 

 identical with Arges prenadilla CXnder & Valenciennes. 



These tAvo positive assertions, of Valenciennes and Stein- 

 dachner, respectively, l)ecome significant from an examination 

 of our specimens. When first received these examples revealed 

 no trace of an adipose fin excepting what was soon discovered 

 .to he a short spine, sometimes naked i)ut in most cases concealed 

 under the skin, evidenced only hy a slight elevation, which was 

 at first regarded as a "short adipose fin"; but in alcohol 

 there gradually appeared on the back a low, thick, fleshy fold 

 which increased in resemblance to a thick adipose fin with their 

 continuance in the preservative, and, in the smaller individuals, 

 became thin and \v\-y much like an adipose fin in appearance. 



Regarding the adipose fin in Arges sabalo, Steindachner says 

 (I.e., p. 18): 



A more or less puffed, rather deep fold of skin begins on the back 

 behind the dorsal, at a distance equal to the whole or rather more than 

 half the length of the base of the fin, and unites with the upper caudal 



* Hist. Nat. Poiss., XV. 

 tFlussfische Sudam., IV, 21. 



