330 FISHES FROM MAZATLAN. 



with a moderate keel. Band of palatine teeth quite short and small. 

 Barbels very long, the maxillary barbel reaching middle of pectoral. 

 Pectoral spine \.\ in head. 



6. Poecilia butleri, sp. uov. 37158. Rio Presidio. Six specimens. 



Allied to Poecilia dovii Giiuther, but with deeper body and larger 

 scales. Head 3| to 3§ in length to base of caudal; depth L >: , ? (adult) to 

 young). I). !», A. 8. Scales L'.". to 25. Length of adult 2 inches. 

 Urigin of dorsal midway between base of caudal and front of eye and 

 over tenth scale of lateral line; (ins moderate, longest ray of dorsal 

 about as long as head without snout; caudal scaly at base; caudal 

 peduncle compressed and deep; color uniform olive, the young with 

 faint dark cross shades; caudal with a few black spots; dorsal with 

 numerous round black spots in both sexes. 



This species is described from five male and one young female speci- 

 mens taken in the Rio Presidio, near Mazatlan. It is named for my 

 friend Mr. Amos W. Butler, Secretary of the Indiana Academy of 

 Sciences. 



7. Mugil curema C'nv. & Val. 37161. Mazatlan. 



8. Centropomus robalito Jordan & Gilbert. 37148(3). Rio Presidio. 



9. Holocentrus suborbitalis Gill. 37153 ((>). Young specimens, the largest i 

 inches long. Tres Marias Islands. 



10. Bairdiella icistia (Jordan & Gilbert). 37147. Rio Presidio. 



11. Genes peruvianus Guv. & Val. 37146 (2). Rio Presidio. 



12. Genes lineatus (Humboldt). Rio Presidio. 



Peetoral one sixth louger than head, not reaching front of anal ; 

 depth 2 in length. Anal dusky. This species is scarcely different from 

 Oerres brasilianus (=Gerres patao Poey) of the Atlantic. 



13. Upeneus dentatus Gill. 37157. Tres Marias Islands. 



A large specimen, much the largest known. Length lOf inches; eye 

 large, 3| in head ; scales 37; teeth all small. 



14. Haemulon sexfasciatum Gill. 37151. Tres Marias Islands. 



15. Pomadasis macracanthus (Giintker). 37160, Mazatlan. 



16. Lntjanus viridis (Valenciennes). 37150. (Diacope viridis Valenciennes. Voyage 

 de la Venus, Zool, 303, PI. I, Fig. 2, very bad.) Tres Marias Islands. 



The rediscovery of this lost species is a very interesting addition to 

 our knowledge of the fishes of tropical America. 



Bead 2| in length (3J with caudal); depth, 3 (3f). D. x, 14, A. ill, 

 8. Scales (7) ( .)-.~>l-17. Length, 8 inches. Body comparatively elon- 

 gate, the back not strongly compressed and little elevated ; profile from 

 snout to nape almost straight, thence gently and regularly curved to 

 end of dorsal. Snout pointed, .'*{ in head; snpraoccipital keel little 



