496 Mr. C. T. Regan— A Bevision 



III, 28 to 35 scales in a longitudinal series. 



A. D. 0. 29 to 31 scales in a longitudinal series. 



A. 10-11, ending below first ray of dorsal, 



which is twice as distant from base of 



. pectoral as from base of caudal 12. ornatus. 



A. 9-10 ; dorsal origin 3 times as distant from 



occiput as from base of caudal 13. atratus. 



A. 8 ; dorsal origin above middle of anal, 3 times 



as distant from middle of eye as from base of 



caudal 14. obscurus. 



B. D.7-9. A. 10-13, ending below middle of dorsal. 32 1 



scales in a longitudinal series. 



Dorsal origin twice as distant from bead as from 



base of caudal 15. strigatus. 



Dorsal origin twice as distant from some part of 



eye as from base of caudal 16. (jeatji. 



Dorsal origin three times as distant from eye as 



from base of caudal . 17. pmictatusf. 



C. D. 8-10. A. 11-14, ending below posterior part of dorsal. 



a. A. 11 to 12. 31-33 scales in a longitudinal series. 



Dorsal origin twice as distant from head as from 



base of caudal 18. isthmensis. 



Dorsal origin equidistant from middle of pectoral 



and base of caudal ; head 3^ in length offish ; 



pectoral nearly reaching pelvics ]9. brasi/ie7isif<. 



Dorsal origin equidistant from middle of pectoral 



and base of caudal ; head 4 in length of fish ; 



pectoral not nearly reaching pelvics 20. hreviceps. 



b. A. 14. 



34 scales in a longitudinal series 21. bakanii. 



30 scales in a longitudinal series 22. brevis. 



1. Rivulus peruanus. 



Haplochihis peruanus, Regan, Ann. Mag. Nat. Hist. (7) xii. 1903, 

 p. G26. 



Depth of body about 5 in length, length of head about 4. 

 Head broader than deep. Diameter of eye 3^ in the length 

 of head. 45 to 47 scales in a longitudinal series. Dorsal 

 10-11 ; origin above middle of anal, twice as distant from 

 eye as from base of caudal. Anal 14-16, ending below last 

 2 or 3 rays of dorsal. Pectoral f or f length of head, not 

 reaching pelvics, which do not or barely reach the vent. 

 Brownish, with darker longitudinal stripes along the series 

 of scales and small dark spots on the vertical fins. 



Peru. 

 1-2 (typ^s)- ■^S mm. Perim, Peru, 800 metres. Simons. 



