479 



Abramis. 



I have discussed this genus in Proc. Biological Soc. Washington^ 

 XXII, p. 211. The so-called American Abramis belong to a distinct 

 genus, Notetnigomis. 



Barbus, 



I have given a general account of this genus in Proc. Biol. Soc, 

 Washington, XXIII, p. 145. There is much more to be said, but it 

 may be left for a future paper treating of the genus as represented in all 

 parts of its range. Very few species have scales resembling those of 

 the type of the genus. There is a curiously close resemblance between 

 the scales of Barbus callensis from Algiers (Playfair) and those of Po - 

 gonichthys macrolepidotus from San Francisco, California (Dr. W. O. 

 Ayres). Seen without a lens, the scales of the two look exactly alike, 

 except that those of the Pogouichthys are somewhat larger. Upon closer 

 comparison, the Pogonichthys scales differ by the absence of basal radii,, 

 and the denser circuii. Pogonichtìtys is an isolated genus in the Ame- 

 rican fauna ; it has been compared with Sonotilus of the eastern states, 

 but the apical circuii are not angled as in Semotilus. I think it must 

 be a remnant of the miocene invasion from Asia. It is with scales of the 

 Barbus callensis type that we find a meeting-place (so far as squamation 

 goes) for Barbus^ Leiiciscus and Ciiondrostoma. 



Leusciscus. 



For several species, see Proc. Biol. Soc. Washington, XXII,. 

 p. 215. The following palaearctic sj)ecies are additional. 



L. pyrenaicus. Mountain rivers near Gibraltar (Lt. Col. Irby). 

 Scale about as broad as long, with strong laterobasal angles; apical 

 radii about six entire, others only developed in the submarginal region; 

 basal radii few. Resembles L. vulgaris. 



L. alburnoides. Mertola, Guadiana (Gadow). Differs conspicu- 

 ously from L. pyrenaicus hy having about 12 very well develeped apical 

 radii, basal radii better developed , and the apical circuii very coarse 

 and distinct, The scale is longer than broad, and the nucleus is dis- 

 tinctly basad of the middle. The scale is altogether quite chondro- 

 stomoid. 



L. illyricus. River Tadro, Dalmatia (Dr. Werner). Scale like 

 that of L. alburnoides., but smaller, with rather fewer apical radii. If 

 shown the scale alone, I should take it for that of a CJiorulrostoma. 



L. friesii = meidingeri. Lake of Derkos, Constantinople (Milli- 

 gan). Scale quite large; apical radii irregular; basal radii very many. 

 Much like L. cephalus. 



