ADDENDA. 485 



A.dd to page 258 : — 

 78 a. Leuciscus boucardi. 



D. 9. A. 9-10. L. lat. 39. L. transv. 7/5-6. 



The height of the body is nearly equal to the length of the 

 head, which is one-fourth of the total (without caudal); caudal 

 peduncle twice as long as deep. Head thick, obtuse ; cje of mode- 

 rate size, two-thirds of the length of the snout, and two-ninths of 

 that of the head. Snout convex, overlapping the lower jaw ; mouth 

 broad, its cleft not extending to the anterior margin of the orbit. 

 Praeorbital longer than deep, larger than the postorbital. Origin of 

 the dorsal fin immediately behind that of the ventrals, and nearer 

 to the root of the caudal than to the end of the snout. Caudal fin 

 moderately forked ; pectorals terminating at some distance from 

 the ventrals. Lateral line complete. There are three and a half 

 longitudinal series of scales between the lateral line and ventral fin. 

 Back brownish ; a bluish band along the side, terminating in a small 

 blackish spot at the root of the caudal fin. Pharyngeal teetli 5 — 4, 

 hooked. 



Mexico. 



a-d. Three and a half inches long. Cuernavaca. From M. Bou- 

 card's Collection. 



Page 264. Add a new genus : — 

 60 a. GRAODUS. 



Body oblong. Scales of moderate size ; lateral line complete, 

 running in the middle of the side of the tail. Dorsal fin short, 

 without spinous ray, opposite to the ventrals; anal fin short. 

 Mouth rather small, anterior, with the upper jaw somewhat longer. 

 Upper jaw protractile, lower with the labial fold not extending 

 across the symphysis. Barbels none. Gill-rakers rudimental. 

 Pseudobranchiae. The attachment of the branchial membrane to 

 the isthmus takes place opposite to the angle of the prseoperculum. 

 PJiaryngeal teeth quite rudimental, replaced hy a somewhat uneven 

 ridge of the hone. Intestinal tract short. 



Mexico. 



1. Graodus nigrotseniatus. 

 D. 9. A. 9. V. 8. L. lat. 35. L. transv. 6/4. 

 The height of the body is contained five times in the total length 

 (without caudal), the length of the head four times and one-third. 

 Snout obtuse, convex, longer than the diameter of the eye, which 

 is two-ninths of the length of the head. The maxillary docs not 

 extend to the vertical from the front margin of the orbit. Pite- 

 orbital about as deep as long, much larger than the narrow sub- 

 orbital. There are three longitudinal series of scales between the 

 lateral line and ventral fin. Origin of the dorsal fin opposite to 



