234 PROCEEDINGS OF THE ACADEMY OF [Apr., 



Nos. 8,241 and 42, A. N. S. P., cotypes of L. jeanesianus Cope. 

 Nauta. J. Orton. 



Also other examples from the above localities. 



Chaetostomus sericeus Cope. 



L.c, 1871, p. 288. Ambyiacu River. 



No. 22,005, A. N. S. P., type. Ambyiacu River, Ecuador. J. 

 Hauxwell. It is not a species of Xenocara, as suggested with question 

 by Regan,'^ though closely related to his C. maculatus." 

 Ancistrus dolichopteryx Kner. 



Two from Pebas, Peru, received from Cope. They agree with 

 Kner's account and figure, though are a little larger. They are 

 also rougher and the spines more or less spinescent. The fins are 

 spotted with blackish. 



Ancistrus alga (Cope). 



Chcetostomus alga Cope, Proc. Acad. Nat. Sci. Phila., 1871, p. 287, PI. 15, 



fig. Ambyiacu River. 

 ChcBtostomus malacops Cope, l.c. Ambyiacu River. 

 Chcetostomus tectirostris Cope, I.e., p. 288. Ambyiacu River. 



Nos. 16,461 and 62, A. N. S. P., cotypes of C. alga Cope. Ambyiacu 

 River, Ecuador. J. Hauxwell. 



No. 8,299, A. N. S. P., cotype of C. malacops Cope. Ambyiacu 

 River, Ecuador. J. Hauxwell. 



Nos. 8,298 and 8,300, A. N. S. P., cotypes of C. tectirostris Cope. 

 Ambyiacu River, Ecuador. J. Hauxwell. 



This species is allowed distinct and closely related to A. hoplogenys 

 (Giinther), which is described as having but 8 or 9 interopercular 

 spines. I have two examples, of nearly similar size, of A . hoplogenys 

 from the Rupununi which agree in this character. Further, they 

 are also white-dotted. The types of C. alga show the interopercular 

 spines as 11 to 13, which appear to exceed any variation found in 

 A. hoplogenys. Cope's figure of C. alga does not indicate all the 

 interopercular spines. The types of C. tectirostris show the D. I, 7, 

 rarely I, 6, and the interopercular spines 11 or 12. 



Ancistrus cirrhosus (Valenciennes). 



Chaitostomus variolus Cope, Proc. Acad. Nat. Sci. Phila., 1871, p. 288. 

 Ambyiacu River. 



Nos. 21,284 and 85, A. N. S. P., cotypes of C. variolus Cope. 

 Ambyiacu River, Ecuador. J. Hauxwell. 

 Also four others with same data. 



'' Trans. Zool. Soc. London, XVII, 1904, p. 252. 

 '■ L.c, p. 246, PI. 14, fig. 4. Rozmani, Upper Peru. 



