ADDENDA — 86. SERRANID^ HYPOPLECTRUS. 917 



§36 (b). S. iiag:rescens (Bloch & Scliu.) Goode & Beau. 



According to Dr. Holbrook the northern representative {nigrencens) of 

 Serranus atrarius has the air-bhidder simple, and the pectoral as long as 

 the ventral; while in the southern form {atrarius) the air-bladder is sac- 

 culated, and the pectoral longer than the ventral. These observations 

 are confirmed by Dr. Beau, who has also noticed other i)oints of differ- 

 ence. The northern form (Cape Hatteras northward) may then stand 

 as S. nigrescens. 



{Corypkcena nigrescens Bloch & Schneider, 1801, 297: Ccntropristia nigricans C. &. V. 

 iii, 37, and of various authors.) 



Page 534. In Serramis trifurciis the filamentous tips to the dorsal 

 spines are often but little developed. A species, apparently the same, 

 occurs in the Gulf of Mexico. Head 2f ; depth 3f. D. X, 12; A. Ill, 

 7; scales G-48-13. The section called ^^ HaJqjerca" should be Prionodes* 

 Jenyns. 



Page 535. To the account of Serranus siibligarius add: 

 A large blotch of cream-color with sharply defined edges in front of 

 vent, extending upwards as an irregular cross-band to near middle of 

 sides; an interrupted black ring around tail at base of caudal; a large 

 black blotch on front of soft dorsal; lower parts of head with a very 

 conspicuous network of bluish streaks; pectorals, anal, and caudal, 

 sharply barred with black; ventrals tipped with black. Body deep, 

 compressed; the head very slender, acuminate, the anterior profile 

 straight or somewhat concave; depth at middle of eye little more than 

 half-length of head; lower jaw little projecting; maxillary reaching 

 posterior margin of pupil, 2^ in head; canines small, those on sides of 

 lower jaw largest; edge of ineopercle sharply and subequally serrate 

 gill-rakers short. Dorsal little emargiuate, the fourth spine 3 in head 

 caudal subtruncate; second anal spine longer than third, 2^ in head 

 jaws, and dorsal and anal fins scaleless. Head 2i; depth 3; D. X, 13 

 A. Ill, 7; scales 6-42-17. 



Pages 536, 537, etc. All the species of Serranus have normally 10 

 spines in the dorsal.- 



Page 536. Instead of subgenus Plectropoma substitute: 



274 (/»)•— HYPOPI.ECTRUS Gill. 

 (Gill, Proc. Ac. Nat. Sci. Phila. 18G2, 2'3G: type Plectropoma pueWu, C. «fe V.) 



This genus differs from Serranus chiefly in the presence of antrorse 



* Prionodes Jenyns, Zool. Beagle. Fish. 1842, 46: type Prionodes fasciatus Jenyns. 



