FISHES OF THE FAMILY LOEICAEIIDJS. 249 



smaller eye (diameter 10 times in the length of head), 4 or 5 interopercular spines, 

 and the pectoral spine not extending beyond the anterior ^ of the ventral. Yellowish 

 brown, without spots ; tips of the lobes of the caudal light. 



The type, from Puerto Cabello, Venezuela, is 20-5 mm. in total length. 



9. fCHjETOSTOMUS GUAIRENSIS. 



Chcetostomus guairensis Steind. Denkschr. Ak. Wien, xliii. 188], p. 121, pi. iii. fig. 1. 



Depth of body about 5§ times in the total length, length of head 3 times. Head 

 as broad as long and nearly twice as long as deep. Diameter of eye 5-7 times in the 

 length of head, interorbital width 3 times, length of snout If— 2 times. Interoperculum 

 armed with 4-5 spines. 23 scutes in a longitudinal series, 6-7 between dorsal and 

 adipose fin, 10-11 between anal and caudal. D. I 8, the first ray equal to -f the 

 length of head, the last f as long ; length of base of dorsal equal to its distance from 

 the posterior -J of the spine of the adipose fin. A. I 5. Pectoral spine extending a 

 little beyond base of ventral. Caudal slightly and obliquely emarginate. Caudal 

 peduncle about 2\ times as long as deep. Head with large light spots separated by a 

 dark network ; body greyish, marbled with darker ; fins, except the anal, with dark 

 bars ; caudal with a narrow light edge. 



This species, founded on specimens up to 110 mm. in total length, from Caracas, 

 Venezuela, may prove to be identical with the preceding. 



10. CHiETOSTOilUS makginatus, sp. n. (Plate XIII. fig. 1.) 



Depth of body 5-|-5-f times in the total length, length of head 3^— 3|- times. 

 Head as broad as long and about 1;§ times as long as deep. Diameter of eye 7-9 

 times in the length of head, interorbital width 3-3^ times, length of snout If- If times. 

 Length of mandibular ramus equal to or a little greater than the interorbital width. 

 Interoperculum armed with 5 short spines. 24-25 scutes in a longitudinal series, 

 7-8 between dorsal and adipose fin, 10-11 between anal and caudal. D. I 8, the first 

 ray equal to -§ the length of head, the last f as long ; length of base of dorsal equal to 

 its distance from the adipose fin. A. I 5. Pectoral spine extending to anterior -g- of 

 ventral. Caudal slightly and obliquely emarginate. Caudal peduncle 2-f— 3 times as 

 long as deep. Olivaceous, with little yellowish dots on the head ; dorsal rays and the 

 membrane on each side blackish, leaving a light streak in the middle of each inter- 

 radial membrane ; caudal with a narrow light edge. In the young a series of light 

 spots on each dorsal ray. 



Total length 190 mm. 



Three specimens, from Salidero, N.W. Ecuador, collected by Mr. Rosenberg, had 

 been referred by Boulenger to C. microps in his account of the Rosenberg collection. 



2l2 



