596 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 101 



serrated, anterior margin smooth; no suborbital serrations; scales 

 ctenoid with 10 to 12 radii in anterior field only; upper jaw reaches 

 vertical drawn through middle of eye ; lateral line complete ; longest 

 gill raker twice as long as longest filament, and about twice in diam- 

 eter of eye ; a single, flat opercular spine. 



Villiform teeth in jaws, vomer, and palatines; those in upper jaw 

 in a wide band ; a wide patch or band anteriorly in lower jaw, reduced 

 to two irregular rows posteriorly ; teeth on vomer in a narrow patch ; 

 palatines with a single row; body comparatively deeper in adults; 

 caudal fin emarginate; contour of soft dorsal and anal fin convexly 

 rounded, pectoral moderately rounded; depressed spiny dorsal fin 

 reaches origin of soft dorsal in some specimens; pelvic fins extend 

 beyond vent, reaching anal origin in some specimens. 



Table 4. — Measurements expressed in thousandths of the standard length of 



Apogon erdmani 



Measurement 



Standard length, mm 



Sex 



Greatest body depth 



Body width 



Head length... 



Head depth at occiput.. 



Length of caudal peduncle. 



Least depth of caudal peduncle.. 



Length of longest pectoral ray _ 



Length of third spine of spinous dorsal 



Diameter of eye 



Length of upper jaw 



Length of snout 



Least width of bony interorbital 



Tip of snout to origin of spinous dorsal fin 



Tip of snout to origin of anal fin 



Tip of snout to insertion of pectoral fin 



Tip of snout to insertion of pelvic fin 



Tip of snout to anal opening... 



44 

 9 



437 

 184 

 426 

 368 

 241 

 184 

 299 

 214 

 172 

 214 



92 

 115 

 437 

 690 

 414 

 437 

 652 



Color in alcohol. — Body and head light to dusky in smaller speci- 

 mens to dusky or blackish in larger ones; a conspicuous black 

 triangular mark extending from below eye to angle of anterior margin 

 of preopercle ; a characteristic black band encircling caudal peduncle 

 at base of caudal fin ; pectoral and pelvic fins transparent to dusky ; 

 dorsal, anal, and caudal fins dusky; Donald S. Erdman, collector of 

 these specimens, reported to me that this species possessed no other out- 

 standing colors when alive, and that the dusky to blackish body colors 

 were somewhat lighter and silvery. 



Named erdmani in honor of the collector, Donald S. Erdman. 



