72 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



orbital cirri present ; median cristae of trunk continuous with 

 inferior cristae of tail ; dorsal rays about 21 or 22 ; pectoral 14 ; 

 rings 15+35; anus to pectoral base more than twice in tail; 

 isnout ly^ in postorbital leiigih of head; eye equal to snout. 

 Micrognathus mataafae (Jordan and Seale) 

 6&. Snout longer than postorbital part of head and without a mid- 

 dorsal serrated keel ; dorsal rays 28 to 39 ; rings about 16+35 

 or 36 ; inferior cristae of trunk continuous with inferior cristae 

 of tail ; middorsal region of nape with three keeled plates. 

 7a. Dorsal rays 27 to 29; rings 16+35; pectoral 16 or 17; anal S 

 or 4 ; postorbital part of head above lower level of eye with 

 about eight lengthwise brown lines, more or less reticulated ; 

 a brown streak across ventral margin of eye from snout to 

 lower part of opercle ; reticulated lines form about 13 brown- 

 ish bars, two or three times wider than pale interspaces an- 

 teriorly ; iwstorbital part of head contained 1% times in 

 snout; eye about 1.9 times in snout. 



Corythoichthys fasciatus (Gray) 

 7b. Dorsal rays 32 to 35; rings 16+36 to 39; pectoral 14 or 15; anal 

 3 or 4; postorbital part of head with a brown streak from 

 snout across lower level of eye ; above this a pale streak then 

 another brown streak on level of pupil across opercle ; two or 

 three irregular reticulated lines on top of head ; sides of 

 body with about 25 vertically arranged patches of reticu- 

 lated lines narrower than the pale interspaces ; anus of 

 males black, that of female pale; postorbital part of head 

 contained IVo in snout; eye l.S in snout. 



Corythoichthys conspicillatus ( Jenyns) 



2b. Superior cristae of trunk and of tail continuous; operculum with a keel; 



base of dorsal not elevated. 



8a. Median cristae of trunk continuous with inferior cristae of tall; above 



median cristae of trunk is a row of cristae continuous as median 



cristae on tail ; below median cristae of trunk is a row of cristae only 



on trunk ; inferior cristae of trunk end on ring containing anal fin ; 



egg pouch of male in front of anal fin; color either pale spotted or 



dark spotted, sometimes about live or six pale saddles on back, three 



in front of dorsal and two or three behind it; dorsal rays about 30 



or 31 ; pectoral about 21 ; rings 19+23 to 25. 



Choeroichthys sculptus (Giinther) 

 86. Inferior cristae of trunk continuous with inferior cristae of tail ; median 

 cristae of trunk ends on last trunk ring, no other median cristae; a 

 serrated median dorsal keel on snout ; a bony ridge around orbit 

 dorsally with a blunt spine above eye; two middorsal keeled plates 

 behind eye, the first above base of keel on operculum the second at 

 nape ; cirri on ridge above opercle and in front of gill opening ; all 

 rings with strong cristae but not with spines; body square in cross 

 section, the sides all concave ; color brown with about six pale indis- 

 tinct narrow bars or wide lines ; a few brown spots on sides ; predorsal 

 region is pale ; base of caudal fin pale, blackish distally ; caudal has 

 a white marginal band ; last three caudal rings white ; postorbital 

 part of head a trifle shorter than snout ; eye 214 in snout ; anus a trifle 

 closer to tip of snout than base of caudal fin; dorsal rays 21; pectoral 

 14; anal 4, rings 15+27 Ichthyocampus diacanthus, new species 



