^"I'gyo!"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 69 



Head 3^ to Sf in length; deptli 3 to 3i; maxillary 4^ in head; snout 

 3; interorbital width 4. Eye 2^ in snout. Two canines in front of 

 each jaw; no posterior canines; teeth gradually enlarging towards front 

 of each jaw, those next the anterior pair not more than two-thirds their 

 length. Interopercles greatly produced, meeting or overlapping on 

 median line below. 



Scales somewhat reduced on nape and breast, continuous over me- 

 dian line of nape. Seven or eight oblique rows in front of dorsal, nine 

 or ten series in front of ventrals. Well-defined sheaths at base of dor- 

 sal and anal. 



Caudal fin very deeply lunate, the outer rays greatly produced, 

 forming lobes nearly twice as long as median rays in the adult, but 

 little produced in the young. Outer ventral rays produced, not quite 

 twice length of inner rays, not reaching vent. Pectorals 1| in head. 



D. VIII, 13; A. Ill, 11. Dorsal spines pungent. 



Abundant at Socorro Island; a single specimen from Clarion Island, 

 the largest obtained, llj inches long. 



26. Thalassoma socorroeDse sp. nov. 



Deep brown, each scale on sides with a vertical bluish bar at base, 

 narrowly margined w ith light blue. Sides of head thickly covered 

 with small purplish or bluish spots and broken lines margined with 

 darker blue, those on checks arranged in lines radiating from the eye. 

 Dorsal and anal purplish, a submarginal light streak (probably blue 

 in life), and a narrow white margin. A black blotch on anterior rays 

 of spinous dorsal. Pectorals and ventrals purplish at base, with more 

 or less orange or yellow on distal portion. Caudal brownish, the outer 

 rays tipped with black. 



Head equaling depth, 3 to 3^ in length; depth of caudal peduncle 

 2|^ in head; maxillary 3J; snout 2||; interorbital 4;\. Eye 3 inches in 

 snout. Interopercles meetiug below on median liue of throat. 



Scales reduced on breast and nape, the latter scaled over median 

 line ; eight or nine scales in a row along nape, arranged in five or six 

 oblique series; thirteen oblique rows on breast. Well developed scaly 

 sheaths along bases of dorsal and anal, and series of scales running 

 out on membranes between rays of caudal. 



Outer caudal rays little produced, the outline of fin gently concave. 

 The longest ray equals length of head in front of preopercular mar- 

 gin. Ventrals short, the outer rays not produced, the inner rays con- 

 tained 1| in length of outer. Pectorals short and broad, 1^ iu head 

 Dorsal spines strong and sharp. 



D. VIII, 13; A. Ill, 11; Lat. 1., 27. 



Abundant at Socorro Island ; the longest specimen lO.J inches. 



