[15] CATALOGUE OF THE FISHES OF NORTH AMERICA. 



125c Ainiurus nebulosus vmrmoratua^ Holbrook. Vs. (97) 



126. Amiurus vulgaris Thompson. Vn. (99) 



127. Amiurus natalis Le Sneiir. V. (100) 

 127b. Amiurus natalin lividus Katiuesciue. V. 

 127c. Aviiurus natalis hoUi Cope. Vsw. (100i>.) 



128. Amiurus erebennus- Jordan. Vse. (101) 



129. Amiurus albidus^ Le Sueur. Ve. (102,103) 



130. Amiurus lupus Girard. Vsw. (104) 



131. Am.iurus niveiventris Cope. Vse. (105) 



132. Amiurus nigricans Le Sueur. Vw. (106) 



133. Amiurus ponderosus^ Bean. Vw. (107) 



54.— ICTALURUS^Rafinesque. (56) 



134. Ictalurus punctatus Kafuiesque. V. (108) 



135. Ictalurus furcatus Cuv. & Val. Vsw. (109) 



55.— GALEICHTHYS « Cuv. & Val. (57) 

 vS Arius Cuv. & Val. 



136. Galeichthys guatemalensis^ Giinther. P. 



137. Galeichthys seemanni^ Giiuther. P. 



' Aviiurus mamwratus represents apparently a color variety only of Amiurus nehulo- 

 8U8. It inhabits grassy waters southward. 



"Professor Cope describes (Proc. Ac. Nat. Sci., Phila., 1883, 133) a catfish from Bata- 

 toe River, New Jersey, as a new species, under the name of Aviiitrus prosthistitis. Ex- 

 cept that the caudal fin is said to be rounded rather than truncate, this species agrees 

 with A. erebennus, with which species we think that it will prove identical. Great- 

 est width of head equal to depth of body ; eye small, 5 in interorbital width ; dorsal 

 spine inserted much nearer tip of snout than adipose fin ; pectoral spines a little 

 larger than dorsal spine ; maxillary barbel reaching middle of pectoral spine ; hu- 

 meral process extending a little farther ; black, whitish below; fins black ; pectoral 

 and ventral pale at base ; head, 3f ; depth, A\. D. I. 6. A. 24 to 27. Batstoe River, 

 New Jersey. {Cope.) 



^Amiurus lophius Cope seems to be the adult form of ^. albidus. 



•• Amiurus ponderosus is perhaps the adult form of A. nigricans. The type of the for- 

 mer species has 35 anal rays. We have counted 25, 27, 28, and 32 anal rays in four 

 individuals of A. nigricans. 



* It is probably better, if the genus Amiurus is to be retained as distinct from Icta- 

 lurus, to refer to it all the transitional species having the tail forked and the bony 

 bridge, from occiput to dorsal not quite continuous. It is true that this latter char- 

 acter is largely one of degree, but still there is a positive difference between I. punc- 

 tatus SknA furcatus and the fork-tailed Amiuri. 



^ Galeichthts Cuvier & Valenciennes. 



Arius (C. & v.); Hexanematichthys, Guiritinga, Hemiarius, Cephalocassis, Netuma, and 

 Pseudarius Bleeker ; Notarius, Ariopsis, and Leptarius Gill ; Sdadarius and Bagropsis 

 Kner; Cathorops J or. & Gilb.). 



(Cuvier & Valencienes, Hist. Nat. Poiss., XV., 29, 1840; type Galeichthys feliceps 



C. & v.). 



The genua Arius, distinguished from Galeichthys by having the nuchal shield 

 ("occipital process") not covered by thick skin, cannot well be separated from^nMS, 

 as in several species {dasycephalus, brandti &c.) this character is simply sexual. For a 

 full account of tho species of this genus, found on the west coast of America, see 

 Jordan & Gilbert, Bull. U. S. Fish Comm., 1882, 34. 



''Arius guatemalensis Giinther, V. 1864, 145; Jordan & Gilbert, Bull. U. S. Fish 

 Comm., 1882,48; Mazatlan to Panama. 



^ Arius seemanni Giiuther, V. 147; Arius assimilis Jordan & Gilbert, Bull. U. S. Fish 

 Comm., 1882, 47 (not A. assimilis Giinther); Mazatlan to Panama. 



