SOUTH AMERICAN NEMATOGNATHI. 449 



No. 8010. Three specimens .04-. 047 m. long from 

 Jutahy, and No. 8155, one specimen .037 m. are dark 

 brown with pure white dots which are surrounded with 

 a darker shade of brown or ocellated with black; the 

 pectoral and ventral fins similarly dotted, the dorsal 

 plain dark with minute pure white dots at its base, the 

 caudal plain dark brown except a very narrow white 

 margin; ventral surface lighter brown but also dotted 

 with white. D. I, 8. 



442, Ancistrus calamita. 



Hypostomus calamita Guv. & Val. xv, 515, 1840 (Peru, Eio Apu- 



rimac). 



Chntostomiis calamita Giintlier, v, 248 and 432, 1864 (Apurimac). 

 Ancistrus calamita Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. ii r 



48, 1889. 

 Habitat: Apurimac Kiver. 



FAMILY CALLICHTHYID^E. 



=Gallichthyoidei Bleeker, Nederl. Tijdschr. Dierk. i, 

 82, 1863. 



<Siluridce proteropodes Giinther, Cat. Fish. Brit. Mus. 

 v, 4, 1864. Hypostomatince in part. 



=C all ickthy idee Gill, Arrangement of Families of 

 Fishes, 19, 1872. 



Habitat: La Plata to Rio Orinoco; Amazon to Nauta. 



We cannot add anything to the description of this 

 family given in the key. It is as distinct from the 

 Loricariidcv as it is from the Siluridce. It is probably 

 most nearly related to the Pygididce, as the double max- 

 illary barbel of some of the species would hint. The 

 lateral plates are not developed until the fishes have at- 

 tained a centimeter or more in length, and the young 

 resemble very much some forms of the Pygididce. 

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