:>1_Y> CALIFORNIA ACADEMY OF sriKNOES. 



256.3. Ti'iclii '//<//(/</"> nKti'imtrahifi Philippi,!. c. 714. 

 Blackish gray, marbled with many black spots, as in punc- 

 tatus; fins dark. Depth 10 T \; D. 10; A. 6 



256.4. Trichomycterua tennis Weyeiibergh, Actas 

 Acad. Nac. Cienc. Exactas, iii, 12, pi. iii, Buenos Aires, 

 1877 (Sierra de Cordoba, near Cruz-del-eje). Yellow, eyes 

 and barbels black; head triangular; opercle and preop- 

 ercl well armed. Body much compressed. D. 6; A. 5. 



256.5. Trichomycterus corduvensis Weyeiibergh, 1. c. 

 11, pi. iii (Rio Primero). Obscure blotches on the back, 

 the sides with a dusky band. 



256.6. Trichomyeterwt tigrinum Philippi, 1. c. Light 

 with reddish points; fins immaculate. Head tfA : depth 

 6J in total length. D. 9 or 10; A. 6. 



256.7. Pygidium poeyanum. 



Trichomycterus rimdatus Cope, Proc. Acad. Sci. Philad. 

 1874, 132 (Arequipa, Peru); not of Cuv. & Val. Trich- 

 omycterus poeyanus Cope, Proc. Am. Philos. Soc. 1877. 

 47. Pygidium poeyanum E. & E. Proc. Cal. Acad. Sei. 

 2d Ser. ii, 50, 1889. 



Habitat: Western slopes of southern Peru. 



ANALYSIS OF THE SPECIES OF PYGIDIUM.* 



a. Origin of dorsal in front of the origin of the anal. 



b. Dorsal rays 15-21; first pectoral ray not produced in a tilnuieut; gill- 

 membranes joined to the isthmus. 



c. D. 21; origin of dorsal equidistant from occiput and tip of caudal. 

 Anal inserted below the 9th dorsal ray and terminating under the 

 17th. mti 



cc. D. 15; origin of dorsal equidistant from tip of snout and tip of 

 caudal; last ray of the anal under last ray of the dorsal. Distance 

 of anal from base of caudal 3f in the length. maculate 



bb. Dorsal rays less than lo. 



d. None of the dorsal rays prolonged. 

 <. Dorsal placed partly over the anal. 



* In the species examined by as the rudimentary rays of the dorsal and anal are 

 counted. 



