1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 155 



two rows are left between it and the dorsal, then a sharp turn is made 

 which puts it four scales further down, and from there it pursues a 

 nearly direct line to the middle of the base of the caudal fin. 



There are two distinct dorsal fins, the first composed of three slender, 

 flexible spines, their length being contained about twice in that of the 

 head. The second dorsal is separated from the first by a distance 

 somewhat greater than the diameter of the eye, and is composed of 

 twenty-five rather stout, sharp spines and one terminal soft ray; the 

 first three are graduated, the first being contained one and one-half 

 times in the distance between the two fins, the second is about one-half 

 longer, and the third still a little longer; the remaining twenty-two are 

 of approximately equal length, about equaling the distance from the 

 origin oi" the first dorsal to that of the second. The one soft ray is 

 somewhat shorter than the spines, and is well separated from the caudal 

 by a space equal to that between the dorsals. Pectorals inserted under 

 middle of space separating the dorsals, composed of fourteen rays, 

 equaling eye and snout in length, and reaching slightly past origin of 

 anal. Ventrals of two rays inserted directly under origin of first dor- 

 sal and considerably in front of pectorals, which they somewhat exceed 

 in length, in some specimens reaching vent. 



The anal fin begins slightly in front of posterior end of the pectorals, 

 is a little lower than the second dorsal, and reaches a trifle nearer to the 

 caudal fin; the first spine is longer and more slender than the first reg- 

 ular dorsal spine, whilethe second equals the third dorsal in length. The 

 caudal fin is rounded, and in length equals the greatest depth of the fish. 



Coloration (in alcohol), pale, pretty regularly covered with very fine 

 dark puuctulations, thickest on the back, palest below ; a large dark 

 opercular blotch, two similar postocular blotches, and usually a darkish 

 bar extends downward from the eye; upper half of preorbital region 

 dark, outer margin of jaws dark, breast and under parts of head pale, 

 top of head and nape dark. First dorsal quite dark, almost black; 

 second dorsal pale, obscurely mottled with brown, which is disposed in 

 about five indistinct areas; a large black ocellus upon the twelfth and 

 thirteenth spines of the second dorsal, and a similar one upon the 

 twenty-third and twenty-fourth spine; each ocellus is surrounded by 

 a narrow circle of white or pale orange. In the six specimens before us 

 there is a slight variation as to the exact position of the two ocelli ; in 

 one example the second ocellus extends back upon the twenty-fifth spine 

 also; but in every case the twelfth and thirteenth, and the twenty-third 

 and twenty-fourth, are the spines which most evidently locate the spots. 

 Pectorals and ventrals plain; anal paler than dorsal, sparsely covered 

 with tine dark points, so grouped as to form three or four darker areas. 



The description of this specimen is based upon six specimens (the 

 largest 57 mm long), taken from the mass of kelp hauled out by the seine 

 from the bay near Guaymas. 



This species may be distinguished from A. monophthalmus Giinther* 



* Giinther, Cat. Fishes, Vol. Ill, 275. 



