FISHES FEOM CENTRAL AND NORTHERN MEXICO. 
61 
The fishes collected at Salamanca ATere as follows: 
1 . Amemrus dugesi Bean. Several specimens of this fish were taken, and in ahundance it came 
next after Hijhopsls alias. Before seining tlio river the markets were A'isited and a munber 
of specimens Avere there seen. Specimens taken hy tis differ in seA’eral ])articulars from Dr. 
Bean’s original description. The largest specimen measured 14.5 mm. in length. The fol- 
lowing comparative measnremeuts are given, those in ]>areuthesis being taken from the 
type, the others from specimens collected hy the writer. Height of body contained 4 times 
in length (4-} to 5) ; maxillary barbel can he made to reach tlie origin of the ijectorals and is 
contained 4 times (5) in the length of the body; the distance between the eyes oijuals 3 (4) 
times their greatest diameter; the length of the suont is contained 2-i (3) times in the length 
of the head; the posterior nasal barbel is J (-^) the length of the maxillary barbel. Tire 
longest ray of tlie dorsal is contained 6 (C to 7) times in the length of the body. The length 
of the base of the anal lin is contained 2^ (3) times in the distance of the snout to the origin 
of the anal. D. i, 6; A., 18 to 19 (21 to 22); lateral line almofst complete. The dorsal and 
caudal fins Avere tipped Avith black in some specimens. ' 
2 . Moxo.stoma austrinuin Bean. Four small specimens obtained, the largest 01113" 64 mm. long. 
Considering the size of the specimens they agree A'ery well Avith the original description 
taken from fish, Avhich, no doubt, came from the same stream and were collected 1 j 3" Prof. 
Dnges. (See Proc. U. S. Nat. Mns. 1879, 302.) 
3 . Campostoma ornatum Girard. Only a single specimen Avas taken. It agrees Avith others of the 
same species obtained at Chihuahua. 
4. Algansea dugesi Bean. (Proc. U. S. Nat. Mns. 1892, ja. 283.) 
This species is related to Algansea tincella Girard (U. S. and Mex. Bound. Siii’a'., 46, 
pi. 27, figs. 1-4), but from the A"ery meager description and accompanying cut (drawn from 
a market specimen) the identity of the tAvo can not be established. The chief dilference 
betAveeu the specimens described I13" Girard and A. dugesi appears to consist in the size of 
the eye and the general form of the fish. Algansea tincella is deeper and less taiiering from 
the shoulders than Algansea dugesi. In tlie right-hand column of the folloAving table 
I quote the measnremeuts of siiecimens giA’eu by Girard, while the left-hand column shoAvs 
those furnished 113^ the specimens collected hy the author. 
A. dugesi. 
A. tincella. 
Head in l)ody, 4. 
D(*pth in body 4. 
Eye in head, 6 -f-. 
Eye in snout, 1'^. 
Lateral line, 69. 
Scnles above lateral line, 14. 
Scales below lateral line, 12. 
Caudal, without black sx)ot. 
Head in body, 4 — (3|). 
l)ex»tli in body, 44. 
Eye ill head, i^-t- 
Eye in snout, 1. 
Lateral line, 60. 
Scales above lateral line, 12. 
Scales below lateral line, 10. 
Caudal, witli distinct black spot. 
The general outline of Algansea dugesi agrees more uearl 3 " with Algansea australis Jordan 
(Proc. U. S. Nat. Mns. 1879, 300). Algansea airsiralis has, hoAveA'er, a smaller eye, Avhich is 
only 6 in head, .and the scales are 10-55-7 or 8. 
5. Hybopsis altus (.Jordan). IVhitefish. {Hudsunius ultns Jordan, Proc. U. S. Nat. Mus. 1879, 301.) 
General form elongate, A'ery regular, subfusiform, the iirofile presenting a gentle curve 
from the snout to the front of the dorsal; the bell 3 " about as much decurvcd as the back is 
arched; 63 ’e and lateral line on axis of bod 3 '. The folloAviug measnremeuts Avere made from 
a specimen 150 mm. long: Dorsal lin oA'cr A'entrals, and midway between the snout and the 
end of the scales; length of base of dorsal 18 mm., Avliich equals depth of caudal peduncle 
at its narrowest place; it also equals the distance from the eml of the snout to the posterior 
margin of tlie orbit; longest ray of dorsal 30 min., 5 in bod 3 ', equal to distance from the 
anterior edge of orbit to x'osterior edge of oxiercle ; ventral 24 mm., not reaching A'eut, aliout 
the same in length as anal ; ])ectorals Ioav, reaching Avithin three scales of veutrals. Head 
small, conical, 40 mm., a little less than 4 in lmd 3 ', half distance (80 mm. ) from snout to inser- 
tion of dorsal. (Month medium, terminal, and slightly oblique ; inaxillarx'' reaching anterior 
margin of orbit ; barbel very short, but distinct. This barbel Avas oAmrlooked by Dr. Jordan, 
