FISHES FROM THE REVILLAGIGEDO ARCHIPELAGO. 279 



3. The yellow patch extending backward to front of dorsal and below on 

 sides only to a line passing horizontally through center of eve; no color on 

 pectorals, and only a few small blotches on caudal and lower lip; length, 

 16 inches. 



4. Everywhere dark-brown ; scales of sides and lower parts with lighter 

 centers, the brown being reduced to a mere edging; no yellow anywhere; 

 length, 11 inches. 



40. Medialuna californiensis (Steindachner). One specimen from Cerros Island. 



Family SCIJENID^. 



41. Genyonemus lineatus (Ayres). Five specimens from Ensenada, Todos Santos 



Bay. 



Family CHiETODONTlDiE. 



FORCIPIGER Jordan Sc McGregor, new genus. 



Type Chelmon longirostris Cuvier &. Valenciennes. 



This genus differs from Frognathodes Gill in having smaller scales, about 175 in 

 a lateral series instead of 40. Chelmon Cuvier is also closely related, having 

 the same forceps-like mouth; but in the latter genus the spinous dorsal is 

 much less developed, containing about 9 spines. 



42. Forcipiger flavissimus Jordan & McGregor, new species. 



Head 2|; depth 2; eye 6| in head; D. xn-22; A. in, 17; snout 1* in head, 

 its free part 2* in head. Body short, strongly compressed, its outline 

 angular; anterior profile very steep, concave, extending into the forceps- 

 like mouth. Mouth small, at tip of projected head; cleft of mouth 1£ in 

 eye. Scales 9-75-35; small, ctenoid, irregularly placed, smaller on head 

 and bases of fins; rows along lateral line parallel with it only anteriorly; 

 those below run horizontally on lower parts of body and irregularly upward 

 and backward above; lateral line concurrent with back. Dorsal spines 

 extremely strong; fifth spine If in head; longest soft rays 2£ in head; 

 caudal 2\ in head, slightly lunate; upper lobe longer; third anal spine very 

 long, much longer than second, 1* in head; pectoral 1} in head; ventral 1£ 

 in head. Color bright orange, deepest at base of dorsal ; head and nape 

 abruptly black to level of lower point of eye; below this point reddish 

 pearly; breast and lower jaw nearly white; preorbital bones paler than 

 cheeks, which are mottled with brownish ; median region of top of bead 

 paler; pectoral slightly dusky; dorsal and anal colored like body; last rays 

 of anal with a large black blotch, vertically oblong, its longest diameter a 

 little greater than diameter of eye ; not ocellated as in F. longirostris; soft 

 rays of dorsal and anal blackish at tip, the very edge pale; caudal abruptly 

 blackish. 



This species is extremely close to F. longirostris, which is common in the 

 East Indies. The American species differs, however, in the deeper body and 

 much larger anal spot, which is almost round in the East Indian species. 

 This species belongs to the new genus Forcipiger, of which Chelmon longi- 

 rostris Cuv. & Val. may be taken as type. Four specimens from Clarion, 

 and Socorro islands; one specimen from San Benedicto Island. Length, 

 from 5 to 7 inches. Type No. 5709, L. S. Jr. Univ. Mus., Clarion Island. 



43. Chaetodon nigrirostris (Gill). Six specimens from San Benedicto, Socorro, and 



Clarion islands; largest about 6 inches long. 



44. Holacanthus clarionensis (Gilbert). Eighteen specimens from Clarion and 



Socorro islands. A very young example from Clarion Island may be thus 

 described: D. xiv, 17; A. in, 18; head 4$ in total length; depth 2^-; pec- 

 toral equal to head; interorbital space equal to eye; eye 3 in head. Color 

 in alcohol, very pale yellow ; two parallel dark-brown bands passing verti- 

 cally from near lower edge of preopercle to occiput, one on each side of eye, 



