49Q POPULAR SCIENCE MONTHLY 



In the same fashion, gray squirrels and black squirrels belong to the 

 same species. In the same species of globe fish, Tetraodon nigropuncta- 

 tus, some individuals are gray, and some citron yellow. In another 

 species, Tetraodon setosus, some are gray, some yellow and some deep 

 blue. 



In a West Indian species of bass-like fish, strangely misnamed. 

 Hypoplectrus unicolor, an extraordinary polychromatism occurs. All 

 the known individuals belonging to one or another of the following 

 color forms which have been called species: 



a. Soft dorsal checkered or spotted with pale blue or crossed by blue lines (these 

 occasionally obsolete). 

 b. Body dusky, the head and belly orange, the top of the head olivaceous; a 

 black spot on each side of caudal peduncle close behind dorsal; black 

 band or spot in front of eye not bordered by blue; cheeks, opercle and 

 breast with vertical lines of metallic blue; dorsal yellowish; pectoral 

 and caudal orange; a black spot in the axil; upper margin of pec- 

 toral blue; anal orange with blue border; ventral greenish, its base 

 orange. Unicolor (= Maculiferus) . 



bb. Body all violet with 5 or 6 more or less distinct black cross bands, the 

 middle one broadest, covering the space from the fourth to the tenth 

 dorsal spine and meeting its fellow under the belly; the band at the 

 nape broad and saddle-like, bounded by 2 pale cross streaks on nape, 

 opercle and cheeks; snout pale, a pale shade across it; ventrals pale 

 or dark; other fins, except spinous dorsal, mostly pale, 

 c. Cheek with a blue band before eye and some blue spots before it. 



Puella. 

 cc. Cheek without blue band ; no blue spots on snout ; colors duller. 



Vitulinus. 



bbb. Body and head yellow anteriorly; body abruptly black posteriorly, the 



black extending forward to a wavy line reaching from first dorsal 



spine to vent ; a broad dark-blue band in front of eye, bordered by sky 



blue; fins chiefly orange; ventral and anal bordered by sky blue. 



Pinnavarius. 

 aa. Soft dorsal plain, without distinct blue lines or spots. 



d. Preorbitai region with 1 or more dark-blue stripes, bordered by bright 

 sky blue (not fading in spirits). 



e. Body yellow anteriorly, black posteriorly, the black extending for- 



ward to a line joining the nape and last anal ray; fins orange; a 

 single blue-black stripe or spot in front of eye, ocellated with sky 

 blue; caudal peduncle very dark above. Guttavarius. 



ee. Body all orange yellow, fins orange; snout and lower jaw blue; 2 

 blue stripes, each bordered with sky blue, before the eye. 



Gummigutta. 

 eee. Body saffron yellow, orange posteriorly; snout with blue streaks 

 and some blue dots. Crocotus. 



dd. Preorbitai region without blue stripes. 



f. Preorbitai region with violet spots; a round black spot on side of 



caudal peduncle; dorsal light greenish; body light olive green 

 above, reddish below; pectorals pale yellow, the first ray blue; 

 ventrals, anal and caudal light orange. Aberrans. 



ff. Preorbitai region without distinct violet spots. 



