446 CALIFORNIA ACADEMY OF SCIENCES. 



dd. Head as broad as long; eye 3J in interorbital; interopercle with 

 about 14 nonflexible spines; thorax and belly entirely naked; uni- 

 form brown. Head 3; D. I. 7; A. 5. (Giiuther.) calamita 442. 



436. Ancistrus chagresi. 



tAncistrus cirrhosus Kner & Steindachner,Gatt. & Art. v. Fischen 



aus Central America, 61, 1864 (Kio Chagres). 

 Chcetostomus cirrhosus Giinther, Fish. Centr. Am. 478, 1866 (copied). 

 Ancistrus chagresi Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. ii, 47, 



1889 (Eio Chagres). 

 Types: No. 8026; two specimens, ? i .14-.19 m. Eio Chagres; 



Dr. Maak. 



These specimens are most- likely faded. They are 

 light brown, the caudal and lower fins presenting traces 

 of darker markings. 



437. Ancistrus stigmaticus, 



Ancistrus stigmaticus Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 



■ ii, 48, 1889 (Sao Matheos; Goyaz). 

 Types: No. 8022; one specimen, S .11m. Sao Matheos; Hartt •&: 



Copeiand. 



No. ? one specimen, $ .19 m. Goyaz; Senhor Honorio. 



This species has a broad, depressed head, and small eye. 



438. Ancistrus cirrhosus. 



Hypostomus cirrhosus Valenciennes, Voy. d'Orbigny, ix, atlas ii, 

 plate vii, fig. 3, 1847; Cuv. & Val. Hist. Nat. Poiss. xv, 511, 1840 

 (Kio Janeiro; Biienos Ayres). 



Ancistrus cirrhosus Knef, Hypostomiden, 272, 1853 (Kio Guapore); 

 Eigenm. & Eigenm. 1. c. (Cudajas; Obidos). 



ChcHosloimis cirrhosus Giinther, v, 247, 1864 (Essequibo; British 

 Guiana); Hensel, Wiegm. Arch. 1870, i, 76 (stony mountain 

 streams); Vaillant, Bull. Soc. Philom. series 7, iv, 155, 1880 

 (Calderon); Steindachner, Flussfische Siidamerika's, iv, 7, 1883 

 (Kio Huallaga); Boulenger, Proc. Zool. Soc. Lond. March, 1887, 

 277 (Canelos). 



Habitat: Kio Plata to Guiana. 



Seven specimens, .07-.18 m. Cudajas; Obidos. 



438a. Ancistrus cirrhosus dubius. 



Ancistrus cirrhosus dubius Eigenm. & Eigenm. Proc. Cal. Acad. 2d 



Ser. ii, 48, 1889 (Gurupa; Tabatinga). 

 Types: No. 7993, one specimen, ?, .13 m. Gurupa. Prof . Agassiz. 



No. 7984, five specimens, S , 9, .07-. 13 m. Tabatinga. Bourget. 



No. 7983, five specimens, ?, .06-. 10 m. Tabatinga. Bourget. 



This variety differs from cirrhosus in the characters 

 mentioned in the key. 



