482 CALIFORNIA ACADEMY OF SCIENCES. HO 



In life olive green, a bright blue streak, narrow and 

 somewhat interrupted, from eye to base of caudal; a 

 broader dark bronze streak just below it, containing a 

 series of small dark spots, mostly arranged in threes, the 

 last one darkest, at base of caudal, just above middle line, 

 these obsolete in adult; below the bronze band, a -faint 

 blue streak, then a broad brown one, then a short one, 

 bright sky blue bounding the belly, ending over the mid- 

 dle of anal; belly and throat pearl white. Head cherry 

 red and bronze anteriorly, becoming olive in all specimens 

 behind, mottled with blue ; a dark blue edged spot behind 

 eye; a large black spot smaller than eye below fifth dor- 

 sal spine, the spot crescent shaped, bordered with yellow 

 behind, mostly on one scale. Iris red. A golden cres- 

 cent at base of pectoral. Dorsal bright orange, bluish 

 below. Caudal cherry red. Anal bright orange. No 

 spots on fins. Larger specimens deeper in color, the 

 head cherry red, a dark spot bordered with blue behind 

 eye. Pectoral not black. In alcoholic specimens pearly 

 streaks appear on sides of head and behind pectoral. 



Found by Dr. Gilbert at Mazatlan. Specimens have 

 also been obtained at Panama by Giinther, and at Acapulco 

 by Steindachner. 



Our specimens differ somewhat in color from those 

 described by Dr. Giinther, especially in the hue of the 

 head and caudal and in the presence of a black spot be- 

 hind eye. They are, however, probably not specifically 

 distinct. 



181. Thalassoma lucasanum (Gill). 



Obtained by Dr. Gilbert at Mazatlan: not seen by us. 

 Also recorded by Mr. Forrer from Tres Marias, the 

 original types taken by Xantus at Cape San Lucas. 



