268 • PATAGONIAN EXPEDITIONS : ZOOLOGY. 



R. A. 18-25. A silvery-gray lateral band, a dark caudal spot fading 



out forward. Usually a humeral spot. Maxillary with two small 



teeth. Head 4 ; depth 2}-3 ; scales 7 or 8-37 to 40-3 ; eye 3 in 



head. 43. mexicanus (Filippi). 



RR. A. 24-27. Origin of the dorsal behind the base of the ventrals ; 



-maxillary toothless, or with one or two teeth, reaching anterior 



border of the orbit. Head 4; depth 2j-2| ; scales 7 to 9-35 to 



39-6 or 7. 25. (Btietis (Giinther). 



RRR. A. 18-25. A dark caudal spot extending to the end of some of 



the rays and fading out anteriorly ; a silvery lateral band ; an 



indistinct humeral spot ; ventral and pectoral fins with red. Head 



4, longer than its depth at the occiput ; depth 2^-3 ; scales 5 



or 6-32 to 40-4^ to 6 rarely 7. 44. fasciatus (Cuvier). 



RRRR. A. 25-30; depth 2.6-2.66. 23. nitihis. 



RRRRR. A. 3. 16-19. Three or four scales below the lateral line. 



Head4-4j; depth 2J-3 ; scales 5-35 to 37-3 or 4. A. 



3, 16-19. 45- fiJsciatus iheringii (Boulenger). 



QQ. Numerous minute teeth on the maxillary which extends either a little 



or distinctly behind the front margin of the orbit. Eye small 3.5-4 



in the head. A vertically elongate humeral spot and a longitudinal 



caudal stripe extending to the end of the rays and fading out anteriorly. 



Head l\-l\; depth 3-3^; scales 5-33-4- A. 16-18. 



46. jenytisii (Steindachner). 

 PP. Middle caudal rays not black. 

 S. Scales in lateral line 34-38. 



T. A. 23-28 ; depth 2.4-2.7 ; scales 6\ or 7|-34-37-5i-6i. 



31. fischcri, which see. 



TT. A. 19 or 20.' Almost colorless ; caudal rays sometimes dusky, a 



grayish lateral band. Pectorals reaching § to ventrals, ventrals | 



to anal. Maxillary, with two teeth, reaching to eye. Head 4 ; 



depth 3.2-3.75 ; scales 4 or 5-35 to 38-4. 



47. mccnkhmisi (^x^&Tsxn. & Kennedy). 

 TTT. Anal 17-18. Yellowish above, white on the sides ; lateral band 

 plumbeous above, silvery below , a plumbeous humeral spot. 

 Head 4J to 4^; eye 2\ in head; depth 3.2-1.6. Lateral line 

 34-36. Dorsal band, large part of anal, the body near it and 

 the median spot of the caudal more or less red. 



48. rubropictus (Berg). 

 TTTT. A. 18; scales 37 or 38; depth 3^; head 4J ; plumbeous, 

 fins dusky ; pectorals reaching ventrals ; ventrals nearly to anal ; 

 caudal lobes rounded ; snout blunt, lower jaw distinctly shorter 

 than upper ; a faint humeral spot. Mouth very small, maxil- 

 lary not reaching eye ; eye 3| in head, interorbital very con- 

 vex, less than 3 in head ; depth of caudal peduncle little less 

 than half the greatest depth. 



49. eigenmanni Evermann & Kendall. 

 * 26 in one specimen. 



