440 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



series and the front of the second dorsal. The scales are rather 

 thin, and are thickly beset with short slender spinules, which are 

 directed outward and backward, and are arranged in definite quin- 

 cunx order, except on and near the head, where they fall into 

 very widely divergent rows. The scales of the head bear weak 

 spinules, which are smaller than those of G. argentatus; those on 

 the ridges of the head are little strengthened. Instead of being 

 followed by a single median scute, as in G. argentatus, the occipi- 

 tal scute is preceded on each side by a similar scale. The squa- 

 mation of the head is more complete than in C. argentatus: the 

 anterolateral region of the snout is largely scaled, leaving only a 

 narrow scaleless groove adjoining the series of scales which bounds 

 the median rostral series on each side ; the under surface of the head 

 is wholly scaled, including the rami of the mandibles, and exclud- 

 ing only the lips and the gular and branchiostegal membranes. 

 In other respects the squamation of the head is the same as in 

 G. argentatus. 



The length of the first dorsal base is contained 1.2 (0.75 to 1.3) 

 times in the interdorsal space, 1.8 (1.5 to 1.9) times in the postorbital. 

 The anterior rays of the second dorsal fin are very short. The origin 

 of the anal is slightly behind (or slightly before) the vertical from 

 the origin of the second dorsal. Length of fin-rays in the head 

 (in paratypes) : second dorsal spine, 2.1; pectoral fin, 2.4 to 2.65; 

 outer ventral ray, 3.0 (3.2 in type), sometimes reaching anus; inner 

 ventral rays, 3.75 to 4.2. 



Coloration in alcohol. — The dark markings of the body consist 

 anteriorly of weakly ocellated dorsal saddles, and posteriorly of 

 dark bars; a dark blotch is located on the lateral line below the first 

 dorsal. The sides of the body and head are silvery, but there is a 

 dark blotch on the opercles. The gular membrane is punctulate, 

 with but traces of the cross striae or black ridges characteristic of 

 this region in G. argentatus ; the branchiostegal membrane is black 

 ventrally, and blackish or dusky laterally. The skin over the pec- 

 toral girdle is mostly silvery, but becomes abruptly dark brown over 

 the anterior face of the girdle before the pectoral fin. The buccal 

 cavity is lined with whitish; the walls of the branchial cavity are 

 dusky (except over the hyoid arches, where they are whitish), be- 

 coming blackish posteriorly, but with an abrupt whitish margin 

 along the edge of the opercular and branchiostegal membranes. The 

 parietal peritoneum is brownish black, underlain with silvery; it is 

 sometimes whitish over the posterior portion of that organ which 

 lies in the body wall before the anus. This organ is superficially 

 covered by a black streak, with an anterior dilation between the 

 ventral fins and the isthmus and a posterior dilation in front of the 

 anus. From each side of these dilations a diffused darker area 



