FISHES OF THE FAMILY LORICARIID®. 245 
Key to the Species. 
I. Fold of the upper lip with median prolongation 
—_ 
. C. loborhynchus Tschudi. 
II. Fold of the upper lip without median prolongation. 
A. Interorbital width 23-2$ times in the length of head. 
Diameter of eye 9 times in the length of head (in specimens of 
65 mm.) 
ci) 
a “see SG 0 6 'o ao 0 4 So oy op an GRATIS Uslean. 
Diameter of eye 6 times in the length of head (in a specimen of 
LOOT) ee ese, Qe. Se) eee AD Oy Pe ee fet. BSC marcapate Ren. 
B. Interorbital width 3-3} times in the length of head. Dorsal with I 8 rays, the last 1-2 
as long as the first. 
1. Length of base of dorsal equal to its distance from posterior part of spine of adipose 
fin. 
a. Anal with I 4 rays ; 5-10 interopercular spines ; caudal peduncle 2-2} times as long 
as deep. 
Depth of body 4} times in its length, head 13-12 times as long as 
deep . Se Ge erie Sapeome ee ae ce tae ec 4. C. brevis Rgn. 
Depth of body 5-53 times in its length, head 13-2 times as long 
as deep . 5. C. taczanowskii Stdr. 
6. Anal with I 5 (rarely I 4) rays ; 1-5 interopercular spines. 
a. Depth of body 43-5 times in its length, head 14-12 
times as long as deep, caudal peduncle twice as 
long@asdeep . 5 . 2 =» «. » +. « = » 6: Cl dermorkynchus Bier: 
8. Depth of body about 52 times in its length, head 13-2 times as long as deep, 
caudal peduncle 23-24 times as long as deep. 
1 or 2 interopercular spines . eats las Goede ee 7. C. fischeri Stdr. 
4 or 5 interopercular spines; length of snout 14 times in that of 
thes head Geememme ce hats) o-t sy et mummers) gees ek ee Sea Cestanrre lable 
4 or 5 interopercular spines ; length of snout 12-2 times in that of 
the\headly <yrire 0-71 sia) > ot ome ee Fed Ott 3) ns Oh Chouairensmstar: 
2. Length of base of dorsal equal to its distance from the 
spine of the adipose fin ; caudal peduncle 23-3 times 
EINES UEE) 5 6 6 o 0 o 6.6 0 6 6 © 6 MO Goines Ween 
3. Length of base of dorsal only a little less than its 
distance from) thescaudalilse si.) 2) ee le @xbranieki star: 
C. Interorbital width 34-33 times in the length of head. Dorsal with I 8 (rarely I 7 
or I 9) rays, the last # as long as the first. 
Interoperculum with 6-10 spines. A. I 3-4, Caudal peduncle 
2-21 times aslongasdeep .°. .... =... . ~ - 12. C_anomalus Ren. 
Interoperculum with 4-5 spines. A.1I5. Caudal peduncle 2}-22 
tonesjasslong asi@eep 27 eee es bes sf a) aie end. Go taomesens Soon, 
D. Interorbital width 33 times in the length of head. 
DE e vAL 4... io cee es ee eo lee Oo mmusrosirts Lithny 
