392 Annals of the Carnegie Museum. 



or not quite reaching — the caudal. Anal spine short, or not quite 

 equal to the eye; first anal ray with short stiff bristles. Pectoral 

 spine heavy, with retrorse teeth on its inner margin and short stiff 

 antrorse hairs without; about 4 to 4.5 in the length; reaching or not 

 quite reaching the ventrals. Ventrals short, about five in the length. 

 Caudal very deeply emarginate, the diameter of the eye less than the 

 head. 



Light brown, yellowish below, two to four dark brown spots behind 

 the eye. A whitish spot at the ventral end of each of the upper series, 

 and at the dorsal end of each of the lower series of lateral plates, 

 forming a whitish stripe graduated from the head caudal. Dorsal, 

 pectorals and ventrals dusky. Caudal spot blackish, continued to 

 the tips of the middle caudal rays. Caudal when expanded with five 

 parallel, horizontal black stripes, the middle on the middle caudal 

 rays, the next ones, from the accessory rays across the rays to the tips 

 of the third and fourth above and below the middle. The outer two 

 bands across the lobes near their tips. Anal whitish with two diagonal 

 blackish bars including the spine, the first rays, and the tips of the 

 last rays. Adipose blackish along its free margin. 



Genus Dianema Cope. 

 12. Dianema longibarbis Cope. 



Dianem alongibarbis Cope, Proc. Acad. Nat. Sci. Phila., 1871, 276, pi. 7, fig. 1-15 

 (Arabyiacu River). 



No specimens. 



Genus Chaenothorax Cope. 

 13. Chaenothorax taiosh (Castelnau). 



Callichlhys taiosh Castelnau, Anim. de l'Am. du Sud, Poissons, 1855, pi. 19, fig. 1. 

 Brochis taiosh Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., 2d Ser., I, 



1888, 165 (name only). — Eigenmann and Eigenmann, Occasional Papers, 



Cal. Acad. Sci., I, 1890, 463, in key. 

 Chcenothorax taiosh Eigenmann, Rept. Princeton Univ. Exp. Patagonia, III, 1910, 



403 (name only). 



No specimens. 



14. Chaenothorax bicarinatus Cope. 



Chcenothorax bicarinatus Cope, Proc. Am. Philos. Soc, 1878, 679 (Peruvian Amazon). 

 No specimens. 



