Eigenmann: The Serrasalmin.* and Mylin^. 



263 



Colosoma {Waileina) nigripinnis Fowler, Proc. Acad. Nat. Sci. Phila., 1906, p. 



473. fig- 55 (Peruvian Amazon). 



Habitat. — Amazons. 



Fowler makes nigripinnis a new subgenus, basing it on the fact 

 that the 'anterior and posterior series of teeth are well-separated 

 anteriorly in the upper jaw,' but in the description, p. 474, he says, 

 "In upper jaw five teeth in each external series approximated with 

 our transverse annectant ones," and again, p. 475, he says, "Cope's 



Fig. II. Dentition of Piaractus nigripinnis (Cope), a, b, c, the premaxillary 

 from below, within, and without, respectively, d and e, the dentary from within 

 and without, f • 



statement, that the two posterior mandibulars are in contact with 

 the median pair of the anterior series, and are separated by a narrow 

 interspace from each other, evidently refers to the teeth of the upper 

 jaw." Doubting whether Cope meant the upper jaw when he wrote 

 "mandibular," it is quite evident that Fo\vler again means to say 

 that the anterior and posterior teeth of the upper jaw are in contact.* 

 The rays of the adipose are poorly represented in Fowler's figure, 

 which is a fair representation of the following specimens: 

 5637 a-b. C. M. Two, 220 mm. Manaos, Nov. 16, 1909. Base- 

 man. 



' I have recently examined the specimens described by Fowler and find that the 

 teeth are in contact and that the subgenus Waiteina is a pure synonym. 



