232 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



erate, 50 to 125 in lateral series, ctenoid. Soft vertical fins scaly 

 basally. Ventral base with scaly flap. Lateral line continuous. 

 One dorsal, depressible in groove, with 9 to 14 stout spines, rays 15 

 to 23. Anal spines 3, rays 6 to 9. Pectoral pointed. Ventral in- 

 serted little behind pectoral base. 



A large genus of striking Indo Pacific forms, many especially so 

 as they are marked with black horizontal bands. The West African 

 Diagramella Pellegrin is here excluded from this genus as its con- 

 tour of the head is not elevated. 



Diagramma arndbile Kent ^* and Diagramina amicium Kent ^^ are 

 two names not possible to place. Diagraimna umbrinum Klun- 

 zinger ^^ is based on an identifiable young fish. 



Depth 21/^; head 2%. Snout 31/^ in head; eye 3, little greater 

 than snout ; maxillary reaches 14 iii eye, leaving narrow infraorbital 

 width about i/^ of maxillary expansion, length 3 in head; inter- 

 orbital little elevated. Scales all lost. Preopercle edge serrate. D. 

 XIII, 18 (figure shows XII, 17), third spine 2l^ in head, first 

 ray 2%; A. Ill, 6 or 7 (figure shows 9 rays), second spine 2; caudal 

 1%, truncate; least depth of caudal peduncle 2i/^; pectoral li/^; 

 ventral 1%. Brown, little paler below. Spinous dorsal pale 

 brown, pectoral little darker, other fins pale rosy. Narrow brown 

 line from snout tip to eye and arched a little to follow vertebral 

 column back to caudal peduncle. Length 45 mm. 



ANALYSIS OF SPECIES 



a\ PsEiJDOPBiSTiPOMA. Scales 50 to 60 in lateral line; spinous dorsal strongly 



notched along margin, fin XIII or XIV, 16 to 18; A, III, 7 nigrns. 



or. Plectorhinchus. Scales 70 to 90 in lateral line. 



6\ Body with dark or black longitudinal bands, persistent with age. 

 c*. Fins without dark spots or bands ; ground color gray or brown. 

 d^. Dark bands on body horizontal and parallel. 

 e\ Eight uniformly golden longitudinal bands on head and body (sev- 

 eral yellow longitudinal bands on dorsals in young, fading with 



age) faetela. 



e^ Five to nine longitudinal bands on head and body, each with nar- 

 row bordering black line; fins yellow polytaenia. 



d^ Curved dark band from nape to anal, another as parallel arc from 

 third to seventh dorsal spines to upper caudal base, narrowing 

 terminally and third paler short band along soft dorsal base__ciiictus. 

 (f. Fins with dark spots or blotches. 



f. Body with 3 or 4 longitudinal dark bands. 

 g^. Brownish olive, with 3 blue longitudinal bands on body ; soft 



vertical fins dusky albovittatus. 



g^. Young with 3 large black blotches above joining along middle of 

 side, with age breaking to form longitudinal dark band bifur- 



18 Great Barrier Reef, 1893, p. 369. Queensland. 

 "Idem, p. 3G9. Queensland. 



" Verb. zool. bot. Ges. Wien, vol. 20, 1870, p. 736. Koseir, Red Sea ; Fische Roth, 

 Meer., 1884, p. 31, pi. 3, fig. 9. 



