668 MU. C. TATE REGAN ON 



5. Xenocaua iiETERORnvNCHUs, sp, n. (PI. LXXYI. fig. 2.) 



Depth of body 6 to Q^ in the length, length of head 2|^ to 2|. 

 Head longer than broad and more than twice as long as deep. 

 Diameter of eye 7 or 8 in length of head, length of snovit 1| to 

 2, interorbital width 3. Length of mandibular ramus li to 1| 

 in interorbital width. Snout with tentacles. Interoperculum 

 with about 10 spines, the longest about 4- the length of head. 

 23 or 24 scutes in a longitudinal series, 7 or 8 between dorsal 

 and adipose fin, 11 or 12 between anal and caudal. Dorsal I 7 ; 

 first ray k to |- the length of head, last, when laid back, separated 

 by 3 keeled scutes from adipose fin ; base of dorsal equal to or 

 less than its distance from adipose fin. Anal I 3. Pectoral spine 

 extending to base of ventral. Caudal obliquely truncate. Caudal 

 peduncle 3 times as long as deep. Fins with series of dark spots. 



Two specimens ( $ ), 58 and 80 mm. in total length, from 

 Uruhuasi, Peru (4000 ft.), collected by Messrs. H. & C. 

 Watkins. 



This species is related to X. btifonium, differing somewhat in 

 proportions and also in the much greater width of the naked 

 margin of the snout, into which the bony plates extend as a. narrow 

 median prominence nearly reaching the apex of the snout. 



6. Xenocara MULTisriNis, sp. n. (PI. LXXVI. fig. 1.) 



Depth of body about 5 in the length, length of head 2|. Head 

 longer than broad and twice as long as deep. Diameter of eye 

 8 to 9^ in length of head, interorbital width 2|- to 24-, length of 

 snout li to 2. Length of mandibular ramus 2 in the interorbital 

 Avidth. Snout with many long tentacles ( c5" ). Interoperculum 

 Avith 20 to 25 spines, the longest | the length of head. 24 scutes 

 in a longitudinal series, 6 or 7 between dorsal and adipose fin, 

 10 or 11 between anal and caudal. Dorsal I 7; first ray about 

 5- length of head, last about | as long ; base equal to distance 

 from posterior part of spine of adipose fin. Anal I 4. Pectoral 

 spine extending to anterior i or middle of ventral. Caudal 

 obliquely truncate. Caudal peduncle 2^ to 2|- times as long 

 as deep- Traces of rather large pale spots on head ; dorsal and 

 lower fins with series of dark spots ; caudal dusky. 



Three specimens ( c?), 90 to 120 mm. in total length, from the 

 Humboldt and Novo Rivers, Sta. Catherina, S.E. Bi'azil, collected 

 by Mr. W. Ehrhardt. 



This species is near to A", stigmaticum Eigenm., aiid except for 

 the lai'ger size of the spots on the head might as justly be referred 

 to that species as those that I described as X, stigmaticum from 

 the Mogy-guassu River. Dr. R. von Ihering has wi'itten to me 

 that this locality is not 250, but only 25 miles inland of Santos. 



7. Otocinclus maculipinnis, sp. n. (PI. LXXVII. fig. 3.) 



Closely related to 0. nigricauda and 0. perforatus. Depth of 

 body aboiit 5.4 in the length, length of head 2.|. Diameter of eye 



