154 KI.ATFISHHS (HKTEKUSUMA lA) 



SpiiCIMliNS KXAMINED : 



- (<J, S4, S7 mm.).' Types. Off Ihe (oast of lirazil, ju or J50 fms. " Cliallrnger." 



: ((J. 47. 82 ., ). 



I ((J, 70 mm.). N. .\tlantir. U.S. .Val. .Mus. 



:: (o. 70 ; S. 58 mm.). 28° ,0- N.. 85' 33' W. 



The marked sexual difference.s cliarac trristic of this species have not been described 

 in any other species of Citharichthvs. 



Genus 15. ETROPUS. 



lilrvpus, lordan and Gilbert, 1882, Proc. U..S. Nat. Mii5.,iv, (18S1), p. 364 ]Klropiis crossotus, Jordan 



and Gilbert] ; Jordan and Evermann, iSoS, Bull. U.S. Nat. Mus., xlvii (3), p. 2687. 

 ( ttharuhlhys (part), Parr, K331, Bull. Bingham Ocean. Coll., iv (i), p. 2. 



Very' close to Citharichihys, but eyes always separated by a narrow, bony ridge ; 

 mouth small, the length of the maxillary' 3! to 4 J in that of head ; dentition generally 

 more feeble, the teeth mostly on blind side of jaws ; none of the teeth enlarged. Gill- 

 rakers short or of moderate length, few in number. Vertebrae 34 (10 + 24). 



Si.x species from both coasts of America. 



Synopsis of the Specius. 



I. Depth more than twice in length ; upper profile of head straight or a little 

 concave ; back not much elevated. 



A. Pectoral 4 to ji in length of fish (without caudal). 



1. Dorsal 88-93, anal 72-78 ; snout without scales; 9 gill-rakers on 



lower part of anterior arch ; 50 to 54 scales in lateral Une ; no 

 supplementary scales . . . . . . .1. ecteiics. 



2. Dorsal 67-81, anal 50-60 ; snout partially .scaled ; 5 (occasionally 



6 or 7) gill-rakers on lower part of anterior arch ; 39 to 45 scales 

 in lateral line ; supplementary .scales present, not very numerous 



2. microstonnis. 



B, Pectoral 3 to 35 in length of fish (without caudal) ; dorsal 79-85, anal 



60-73 : snout without scales ; 6 or 7 gill-rakers on lower part of 

 anterior arch ; no supplementary scales ... 3. longiiiiuniis. 



II, Depth about twice in length ; upper profile of head nearly straight ; back 

 moderately elevated ; pectoral about 6 in length of fish (without caudal) ; 

 no supplementary scales ....... 4. internieditis. 



HI. Depth less than twice in length ; upper profile of head more or less concave 

 (at least in adults) , back distinctly elevated. 

 .\. Snout entirely covered with coarse ctenoid scales : supplementary 

 scales present on body, numerous ; about 5 gill-rakers on lower part 

 of anterior arch ; interorbital ridge high ... 5. rimosus. 



B Snout without scales ; no supplementary scales on body ; 6 to 9 (usually 

 7 or 8) gill-rakers on lower part of anterior arch ; interorbital ridge 

 rather low ........ 6. crossoliis. 



The species of this genus are difficult to distinguish and have been frequently 

 confused. For this reason it has proved impossible adequately to disentangle the 

 synonymies of some of the species. 



' The larger is selerted as the holotype. 



