576 



I'ROCEEDINGI^ OF THE NATIONAL MUSEUM. 



VOL. 45. 



smaller and shorter. Gill-rakers on first arch 8 + 23, long and 

 slender. Pectoral fins pointed, the upper rays longest, contained 5.3 

 times in the length. Ventrals 1.8 in head. Second and third dorsal 

 spines highest, equal to snout in length. Anterior' dorsal rays 1.7 in 

 head; first anal rays somewhat longer than those of dorsal. Caudal 

 deeply forked, the lobes acutely rounded; slightly shorter than 

 pectoral. Dorsal fin mserted in advance of a vertical through anal 

 opening, entirely anterior to origin of anal. Base of anal extending 

 well beyond a vertical through last dorsal ray. 



Color in spirits yellowish; a dusky stripe, 1 scale wide extending 

 from occiput to base of caudal; a dusky (silvery in life) lateral stripe, 

 2 scales wide, extending from upper edge of gill-opening to caudal 

 peduncle, where after narrowhig somewhat it ends in a large circular 

 spot at base of caudal. Head with a large dusky spot on opercle; 

 occiput dusky. 



This species appears to be related to AtTierinops insularum or 

 A. affinis, differing greatly from A. regis in having more symmetrical 

 teeth. From A. insularum it differs principally in having a shorter 

 head, a deeper and more robust body, a shorter snout, smaller eye, 

 and one more dorsal spine; from A. affinis in having a smaller head, 

 shorter snout, smaller eye, more widely spaced dorsal fins, smaller 

 scales, and a larger number of dorsal and anal rays. These charac- 

 teristics are best shown in the following table: 



Length of body in millimeters 



Length head 



Depth body 



Length snout 



Diametereye 



Distance between dorsal fins 



Distance between ventral and anal 



Scales in lateral series 



Dorsal spines 



Dorsal rays 



Anal rays 



123 



.22 



.22 



.06 



.061 



.075 



.19 



52 to 66 



5 to 6 



11 



22 



Type. — Cat. No. 74762, U.S.N .M., a specimen 11| inches long, from 

 Yachats River, Oregon, collected by Mr. R. E. Clanton. 

 The accompanying figure is drawn by Mr. W. S. Atkinson. 



