OiiiUlii Luke Fishes 277 



PACE 



•1.1 Pectoral fins without slrnnK si)ini-s;barbils minute or absent, 

 i. Ventral fins without spines; si-eond dorsal fin. if present, without rays, ami small, 

 j. Head without scales, or if present, very minute, 

 k. Dorsal f:n single. 

 I. Ventral surface without long serrac. 

 m. No teeth on jaws; anal fin short with less than 15 m;. 

 n. l>>rsaU"in with more than 10 rays. 



o. Mouth with a long barbel at each comer < v/<r,,.,o ..ir/.i,. 319 



00. Barbels absi-nt . 

 p. Air bladder in two parts, 

 q. Lateral line present. , , ■ 1 



r. Scales about 60-70 in lateral series and reduced in size anten..rly. 



CtUoslnmus commenontt 303 

 rr Scales fewer than about 60 in a lateral series; quite uniform in size. 



Head ven- larRC and dorsallv flattened Ilypentrlium nigricans 3li 



qq Lateral line' absent; body considerably comprvssed in the adult; voung 



with a black lateral band; adulU banded Enmyzon suctUa oblongus ^l^ 



pp. .Vir bla>ider in three parts. , i ■„ 



s Head 4-4.S in IxkIv; halves of lower jaw meeting in a distinct anKle. Lips 



with coa'rse plicae: no papillae on lips .Uoxostoma aurf.,lum 316 



ss Head J s-S.S in body, conspicuously short and tapenng. Ixiwer hp trun- 

 cate behin. I .Voxosloma Usueur, 318 



nn. liorsal fin with fewer than 10 rays. , , , ~ . 



t. Alimentan,' canal long with many coils. Pentoneum black. Teeth 4-4 

 with we'll devi-loiK-d grinding surface. . , , , ■ 



u. Scales before dorsa' fin fewer than 20, and about 40 in a lateral sencs. 



Ilybognathus rfgius 365 

 uu Scales before dorsal more than 20 and conspicuously smaller here than nn 



sides of body Uyhorhynchusm.lalus 366 



tt. Alimentarj- canal short with few coils. Peritoneum usually pale. 1 har>n- 

 geal teeth, with narrow grinding surface, if present. , . , , 



V. Dcntar\- Imni-s iwrallel an<l united in the center of a three-lobed lower jaw. 



lixoglossum maxiltingua 359 

 w. Dcntary l^ones st'paratc; lower jaw normal. 

 w. Pn'maxillar\' protractile. , , , . u 



X Teeth 5-s'anal fin long with more than 12 rays; body deep and much 



cnmpriW-.l. Scales fine and uniform Nolemigonus crysoUucai 360 



XX. Tilth not s S: anal fin usually with fewer than 12 rays, 

 y. Maxillar\' with a minute barlxl near its tip. B<xly robust. Mouth large, 

 extending bevnnd front margin of eye. Teeth 2, 4-5. 2. ^ 



x. Scali-s large, nilher uniform in size; about 4.S in later.il s. n. - ..n . 22 



U-fon- dorsal fin. No bl.ick spot on dorsal fin.. /-ft,. - .W7 



sx. Si-alis smaller on anterior than on I* isterior part .•! 

 in a lateral s« rits ami about 30 before the dorsal. .\ 



<if dorsjil fin in fr..nt Srnwi:. ■> .V»0 



yy. Maxillar%- without barlal. Twth in main row 4-4. M .n!!! 11 • v. r\- 

 large, not extending bevond front margin of eye. 

 a'. AnnI fin short with 7 or K rays. Dorsal fin about opposite ventral lins. 

 Scales iiv"lerate; fewer than about 40 in the lateral si'rit-s. 

 b". Scales on sides of IvmIv not notably deeper than long; those before 

 the dorsal tin large, fewer tluin about 20. 

 c. T«-th in '111. 1 .A .44. 

 d', A consi • ' ! present. 



J, l^.wt r Sotropis helerojon 342 



«•'. I-<>«' • 'ick. . . 



f'. Ijiter.r l>eforc dorsal tin VI rvl.ir>;.-,.ih lit 



12 and ri>:ii!.irl\ .irr^iin;. .1. Snout blunt an! 

 eye. Lateral band abruptly narr.jwe«I at 



ff". Latrn.l l...ti.! I. .. .l.-.-i.Iv i.iv:!n.iii-l .m.l ■•.■- 



dd'. No ciin.spKU..U4 darlc Literal bjllU, culoti ImU. 1. 



distinctly dccur>c«l anteriorly .Vo/ro/yi 



cc". Teeth in two row*. 1. _■ . 



B'. A conspicu<ius dark lat. r-.' ' - ' ' -'T taw bitderwl wi.. 



Solrofni hti. 



