392 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



dorsal and anal, about as long as postorbital part of head and half the 

 eye; anal long and low, its base 2.1 to 2.5 in length; ventral moderate, 

 1.4 to 1.7 in head; pectoral broad, 1.2 to 1.3 in head, 3.9 to 4.6 in 

 length. 



Color variable, grayish to brownish; back with six or seven irreg- 

 ularly shaped dark bars, some of them extending down to about middle 

 of side; side with many other irregular dusky markings, one specimen 

 with dark blotches on lower part of side somewhat connected with the 

 dark "saddles" on back; head somewhat dusky above, with a vertically 

 elongate dark spot behind lower part of eye, sides and lower surface 

 of head merely with dark dots, or the dots on lower surface arranged to 

 form two or three cross streaks; dorsal and caudal translucent, with 

 dark punctulations along the spines and rays, forming indistinct 

 scattered spots, and cross lines on the caudal fin in two specimens at 

 hand; anal dusky (quite dark in one specimen) with a pale margin; 

 ventral dusky, the rays with pale tips; pectoral translucent, with 

 dusky points, and one specimen with indefinite dark cross bars. 



Figure 75. — Hypsoblennius robustus, new species. From the type, 39 mm. long, Independ- 

 encia Bay, Peru (U.S.N.M. No. 128196). 



A juvenile, 19 mm. long, retains three spines on the preopercular 

 margin, the nasal and ocular tentacles are simple and notably shorter 

 than in the larger specimens, and the color is rather pale. However, 

 the dark "saddles" on the back are somewhat evident anteriorly; 

 large dark chromatophores are present on the head behind the eyes; 

 dark dots form indistinct dark cross lines on lower surface of head; 

 the lower half or so of the pectoral remains dark (though somewhat 

 broken up into dots) as in juveniles of several species of blenny; 

 and the dark dots of juveniles remain, in part, on the base of the anal. 



This species has been described from four specimens. Three of 

 these, respectively 19, 39, and 42 mm. (16, 32, and 35 mm. to base of 

 caudal) long, were secured by the Mission at Talara, Callao, and 

 Independencia Bay; and one specimen, 29 mm. (23 mm. to base of 

 caudal) long, was taken by E. E. Coker at Chimbote. The specimen 



