REVIEW OF THE PARROTFISHES 127 



identical in coloration and all other characters except one has canine 

 teeth and the latter lacks them. I therefore attempted to determine 

 the sex of all our specimens that had not been eviserated. Without 

 exception, all 25 adult specimens without canine teeth were females 

 and all 16 adult specimens with canine teeth were mature males. 

 A mature male, 101 mm. standard length, has well developed canines. 

 It was concluded that the presence or absence of canine teeth in this 

 species represented another case of sexual dimorphism. 



This species occurs in the Central and West Pacific and the Indian 

 Ocean. I have seen numerous specimens in lots from the follow- 

 ing localities: Okinawa, 1 lot; Guam, 1; Paumotus, 1; Philippine 

 Islands, 138; Ked Sea, 3; and Mauritius, 1. 



Genus Cryptotomus Cope 



Cryptotomus Cope, Trans. Amer. Philos. Soc, vol, 14, p. 462, 1871 (genotype: 

 Cryptotomus roseus Cope). 



This genus occurs in the West Atlantic and at Bermuda. 



Cryptotomus roseus Cope 



Plates 5c; 25,c 



Cryptotomus roseus Cope, Trans. Amer. Philos. Soc, vol. 14, p. 462, figs. 1, l,a, 



1871 (type locality; St. Martin, West Indies). 

 Cryptotomus crassiceps T. H. Bean, Proc. Biol. Soc. Washington, vol. 19, p. 32, 



1906 (type locality; Cooper's Island, Bermuda; holotype (lectotype) CNHM 



4964 and paratype USNM 163555 both examined). 



This genus and species is characterized by its elongate form; long 

 pointed snout, profile of head pointed, the angle between dorsal and 

 ventral profile about 40 to 50 degrees; inner hp not free at front of 

 snout; no dermal cirrus on anterior nostril, only a raised low rim; 

 external incisorlike teeth at front of mouth, especially those of lower 

 jaw, slanting obliquely forward; when mouth is closed, tips of teeth 

 of lower jaw not directed at those of upper jaw but slanting forward; 

 canine teeth present on side of upper jaw of half grown and adults. 



In alcohol, the pectoral fin base at its dorsal edge has a dark brown 

 or black spot. Dr. Longley (in Longley and Hildebrand, 1941, pp. 

 205-206) describes the color of five specimens as bluish gray above, 

 head green, bluish white below; red stripe from upper margin of 

 opercular cleft almost to caudal base, set off by light lines above and 

 below; two narrow red or blue Hnes from eye to rictus of mouth; iris 

 red; a half dozen red spots below and behind eye; orange red dashes 

 on pectoral base, blue spot at base of upper rays. The dark spot at 

 base of upper pectoral rays is lacking in young shorter than 70 mm. m 

 standard length; a 20-mm. specimen has an oblique dark bar across 

 upper and lower lobes of caudal fin. 



