Jordan and Evermann. Fishes of North America. 2301 



inserted behind dorsal; ventral rays I, 3. (8atMrv/(.o?, ringer; 

 gazer, short for Uranoscopus.) 



DACTYLOSCOPUS : 

 a. Dorsal rays X to XII, 22 to 31; anal rays less than 35. 



b. Soft dorsal with 22 soft rays ; anal with 26. PECTORALIS, 2637. 



bb. Soft dorsal with 28 to 31 rays; anal with 32 or 33 ; scales about 45. 



c. Body rather slender, tho depth about 6 in length (7 with caudal) ; opercular 

 fringe of 15 filaments. TRIDIGITATUS, 2G38. 



cc. Body rather stout, the depth 5 in length (6 in total with caudal) ; oper- 

 cular fringe of 18 filaments. 



d. Back not barred; head blotched and dotted. POEYI, 2639. 



dd. Back with about 10 pale cross bars ; head marked with whitish ; a 

 dark bar at base of caudal. LUNATICUS, 2640. 



ESLOSCOPUS (eVAds, good ; ovcoTrds for Urctnoscopus) : 



aa. Dorsal rays VI, 38; anal rays II, 37; scales 6-51-5. ZELOTES, 2641. 



Subgenus DACTYLOSCOPUS. 

 2037. DACTYLOSCOPUS PECTORALIS, Gill. 



Head about 5 in total length with caudal; depth about 7 (in total). D. 

 XII, 22; A. II, 26; P. 12; V. I, 3. Width of head behind operculum 7 in 

 total length with caudal; eye small, 10 in head; interorbital space ecjuals 

 diameter of eye; preoperculum broader at the angle than in Dactyloscopus 

 tridigitatus; pores well developed ; opercular fringe of 11 or 12 free fila- 

 ments; origin of dorsal between .i and g length of fish from tip of snout; 

 origin of anal under sixth or seventh dorsal ray, the first 12 dorsal and 

 2 anal rays simple. Pseudobranchia3 obsolete. Color light brownish 

 yellow, with dark spots on the back, arranged in lines forming the out- 

 lines of about 6 quadrangular areas, from the angles of which irregular 

 lines proceed downward, converging toward those departing from the 

 angles of adjoining areas; more scattered and irregular spots and dots 

 often present below the lateral line; head lighter, diffused with pink 

 above. Each orbit with 4 diverging bands, 1 in front, a bifurcated one 

 from the antero-inferior angle, and 2 from posterior border, a transverse 

 sinuated nuchal line ; upper angle of operculum whitish, bounded in front 

 by a dark line or spot. (Gill.) Cape San Lucas; not seen by us. (pec- 

 toralis, pertaining to the breast.) 



Dactyloscopus pectoralis, GILL, Proc. Ac. Nat. Sci. Phila. 1861, 267, Cape San Lucas. (Coll. 

 John Xantus.) 



2638. DACTYLOSCOPUS TRIDIGITATUS, Gill 



Head 5 (in total) with caudal; depth 7. D. XII, 28; A. II, 32; P. 13; 

 V. I, 3; scales 11 + i -|-30 = 45. Body slender, much compressed posteri- 

 orly; opercular fringe of 15 separate filaments. Origin of dorsal fin over 

 the lower angle of the base of the pectorals, or immediately before the 

 margin of the operculum, its distance from snout to dorsal 5 in total 

 length of body. Pseudobranchiae very small (overlooked by Dr. Gill, but 

 evident in living specimens). In life, pale sand color above, the lower 

 part whitish ; above 12 narrow cross bands of whitish on the back, not 



