482 CALIFORNIA ACADEMY OF SCIENCES. Tel © 
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. 
