Freshwater Fishes from Costa R>'cx. 463 



the spines subequal from about the fifth to the fifteenth, 

 the last a little more than X the length of head. Anal 

 VI- VI I 8-10. Pectoral shorter than the head, extending to 

 above the first or second anal spine. Caudal rounded. 

 Caudal peduncle deeper than long. Body with 6 dark cross- 

 bars, the two first broad and more or less confluent ; a more 

 or less contiguous blackish longitudinal band from eye to a 

 spot on the upper part of the base of caudal ; vertical fins 

 dusky, the soft dorsal and caudal with series of pale spots. 



Rio Iroquois. 



Six specimens, 80 to 145 mm. in total length. 



Of C. altifrons, the nearest ally of this species, I have seen 

 two specimens from the Rio Grande deTerraba. These have 

 16 dorsal and 5 anal spines and 11 or 12 gill-rakers on the 

 lower part of the anterior arch. The last dorsal spine 

 measures nearly | the length of the head and the subcon- 

 tinuous fold of the lower lip is divided into two deep pendent 

 lobes. 



TOMOCICHLA, gen. nov. 



Differs from Herichthys in having the pelvic fins inserted 

 well behind the pectorals. 



15. Tomocichla underwood/', sp. n. 



Depth of body 2^ to 3^ in the length, length of head 3i 

 to 3f. Snout about as long as postorbital part of head. 

 Diameter of eye 4^ to 6 in the length of head, interorbital 

 width 2^ (adult) to 3 (young). Depth of praeorbital 1 to 1^ 

 the diameter of eye. Maxillary not extending to below the 

 eye ; jaws equal anteriorly or the lower a little shorter than 

 the upper ; fold of the lower lip continuous ; cheek with 4 

 or 5 series of scales ; 9 to 12 gill-rakers on the lower part of 

 the anterior arch. 32 to 35 scales in a longitudinal series, 4^ 

 to 5tt in an oblique series backwards and downwards from 

 origin of dorsal to lateral line, 3 between lateral line and 

 sheath at base of anterior part of soft dorsal. Dorsal XVI 

 13-15 ; middle spines subequal ; last spine ^ to | the length 

 of head ; soft fin rounded, when laid back not or scarcely 

 extending to the caudal. Anal IV 9—11. Pectoral § to f 

 the length of head, not extending to above the anal. Caudal 

 emarginate. Caudal peduncle as long as deep. 6 to 8 

 blackish cross-bars on the side, chiefly below the lateral 

 line ; soft vertical fins with or without series of dark spots, 

 which may form reticulations. 

 Rio Iroquois. 

 Thirteen specimens, 120 to 260 mm. in total length. 



