230 
MEMOIRS OF THE CARNEGIE MUSEUM 
base of the occipital process, which is narrow and reaches, or nearly reaches, the 
plate in front of the dorsal; humeral process spine-like; roof of mouth without teeth; 
head covered with thin skin. 
Distribution.—All rivers from Buenos Aires to Guiana and Venezuela and 
to the base of the Andes (1,800 feet in places); west of the Andes from northern 
Peru to the Chagres river in Panama. 
DISTRIBUTION OF PIMELODELLA AND TYPHLOBAGRUS. 
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De . If elie] aig a | a |8 Collen Pes eS - 
2) | o oe oa | | | “ae |= A.B 3! aleslia | gs oBlhm 
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Als i+ Rela) SI Sl alle .| a |s S 2 a .| O| & -|a4\s 5 
}e/ Slogger |S lS) sl], lee PSS] lal sag sis| slag |e 
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|| sl83/osles| $|s|.| 2l83| sl2e| S| 4] 8i/elssleo]8|slesicul = 
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o Sle ) | a] & wii SILK] ¢ oS a Ep SB} a o}.5 
e| eles) es/se] 2) 2] a] sles] glee) S13) 2) e184) 8] .2) gleFeml & 
Slee je A |PlA|P|ale |aja ja|Slolalo Aa | A | I Zi 
| | met | Fae | | fay: 
SORT OLO sisi.) selene \etis| eo | oer |: 5s a lSpul| allbeq|bac | 
(Ants aorta denorloool ae ; Bila a lla leo am ie slaaeKet 
SLEUIULCHTLEN Ue: ore hell ete efatall ieratell aerate! Edel Reals sei leaa ar ecole lpaollen alle 
gracilis..........)...]+-|s++)+0 v [oe [ese ete | Re tate [Peters crete + |.. Ihe. 
avanhandave..... 2.2) .- ae a | vita [erally Patel 
| | ) 
MOCCUE Se) Se 5) Pee Pree octal es si is j=l alae Pb Sieae Verena] bi cl ks So 
(UIOCISOS oe icun ts Oeil ap alias ook silec | ata aera ee 
Brickleitick ae. Arete lionel nee fe oie law: Sa baalleac 
pectinifera....... ealeolicte |e “|e: Sc tata een [RN orci |..<). 
AMOS, ab oaeeleaclbeollaosio al eeeal aescal eer Wee larelliperlice<ttis- 
. | | | | 
cyanostigma..... Pee al ae 2s ae Ihr Afeis-a]) steam ea uatell es [eae lace | ee (es ee be Sale 
: | 
TILED LOPS Nero aye A) 2 ete) enals| ees A eal lcsal Boal sce) tial Wax lnm Saal le | 
brasiliensis. ..... solide Silese Pe Ne (90 eaves Al Pica Pies al te Pree lec aiyexe | eels eee ea ae 
lalicensee Pee = 4 ae etek misenleesioce pied aoe eed rcieal (ier Pte (Steel Pees ste 0:0 0 
QUSITOLIS a eee ll od eee ete ecred | Sarre | Sap ere (oa ol se [Boe al Bealls |. 
| | | 
NOLOMELAS). «ale a. ee -\|> reife =| ane Joee]eee]eee[F ee] sievell Sexe ae le Peisall =e] Neyeke rete 
LUISE ena ae a che | bol btol\roe| cao a ene Peo ees iene costa iin. 15. 8c mt | il icare.s| ore sol|'s opel) cnet, | eset ated 
WMG tear cs 8 oc oo |bae| |e ol terol Sb0l|Baclloeellaes Feaplbesioce 5 ee Paria evra Percy ence) aig|fioeG lo ; 
lateristriga....... +o... ai hee = BEDE aap boalicg eal apiece a ie : 
vittata Ph fareod & + -- [+ Seed (ric tl ncecl Aba oe ea Jew efree[eee[iee eee feeefeeefeeeleeefecetees|eeet oes ‘ 
itapicuruensis....|.../+ |...) .--|--- Mees Bocas ole s2| «Sc ee he pol hoa lsc 
HU igs ae ae ae veefees|eee[ eee! soz leelte rel iaeat| oir ene heshe [seals 
eigenmanni...... pa a) a ae Bone ae eee Vowel ReSlbse eee Pace ere ey sts. [Pc : 
. | | | 
Vittles CREEPS Coe ie ee oes ee ee J --- [o> hebaed oes aks eae 
transitoria....... Slee steels sca econ ect [ets Al ean) (et ben! Mec eee esol hoo os ietty oo 0 |Hom|| .0< aes 
MEEK, ya he Sicnt cf eee ey Att socl bot er Wofero.e|-a, | repeal eee ere ieee 
. . | 
(Wii Wan oo cogon: Bea Peele pean poe|eu| hon boo) esoldecl| anol bualooo| fic s||220) o> - 
NVUCOSQC ee ee lelbealie= =o! Nees | Pereee alls Pa ees Rete! fito of Se 
GTUSCOS go chews es oe | ERs lien ee ieee leet Al se AG aril aellssal 
| | | | 
MOGESLAN-4e = ah) Ac, - lattes Edeailirsisre ee Bees (eel eee 5 | + lejeus 
. | | | | 
AUNCERSUS rte eis es Pelee ae eral Pra os) ee AM alkene bars 
CROAQTEST oes ec thotare Mare a | eevee escort | ciate ester | eranet econ | eee | oped eye | cee lite |? +i)+ /+ ale Brel aoa 
| 
LOND ALO een een eee ele aie | ae ote [eee fees *: ealeere acral aetaliay + |.. 
CULENTC Ie Sere el tee eae sees le aoe vfs + i+ |+]...]- 
* i] | | 
T. krone... Pen Woe ede See all fete | les | Seat x Be tea | bu et eceletf sva| telaae | ec al| et aes 
a Lad ¢ Tae | « | | ii | « ana are 
2/1 (7 | 2 Hirt 3 |S | eae is pe eee ee 
| 
The species of this well-marked genus differ from each other in the length 
of the adipose fin, the length of the barbels, the length of the pectoral spine, the 
