446 CALIFORNIA ACADEMY OF SCIENCES. 



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

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

 form brown. Head 3; J>. I. 7; A. 5. (Giiiither.) calamita 442. 



436. Ancistrus chagresi, 



1 Ancistrus cirrhosus Kuer &Steindachner,Gatt. & Art.v. Fischen 



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



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

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



1889 (Kio Chagres). 

 Types: No. 8026; two specimens, $ <3 .14-. 19 m. Rio 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, $ .llm. Sao Matheos; Hartt & 



Copeland. 



No. ? one specimen, $ .19m. 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; Buenos Ayres). 



Ancistrus cirrhosus Kner, Hypostomiden, 272, 1853 (Rio Guapore); 

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



Chcetostomus 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 

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

 277 (Canelos). 



Habitat: Rio 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, $ , ?, .07-.13rn. Tabatinga. Bourget. 



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



This variety differs from cirrhosus in the characters 

 mentioned in the key. 



