160 Cocker ell and Allison. — The Scales of American Ciiirrinidse. 



3. Scale very sinall, with a diameter of about 1 nnn. or les>< ... 4. 

 Scale larger '•). 



4. Scale snhcircular; radii about 11; peritoneum silvery, with scattered 



])ali' brown spots aud some black dots .... L. alici;r (Jouy). 



Trovo li., Provo, Utah. 

 Scale I>road ; radii fewer (9 or 10), without the outer divertiin<r oucs 

 seen in aliciiv; per-itoiietoii silver, witli few diffuse large spots aud 



a few black dots L. donqatus (Kirtlaud). 



Cold Run, Columhiaua Co., Ohio. 



."). Scale large aud thin, with weak sculpture; radii 9 to 12; lateral circuli 

 about 32 on each side in a lateral line scale; pmionewm silvery wit 1 1 

 niauy dark spots, the small ones black, the larger brown 



L. hydrophlo.r (Cope). 

 Ross Fork, I'ocatello, Idaho. 

 Scale hroad ; radii 12 to 14; pcriloiH'iim silvery, witli few scattered spots 



L. balteatus (Richardson). 

 Green Lake, Seattle, AVash.; Elk Creek, Oregon. 

 Scale circular, or approximately so, sculpture distinct ..... (1. 



(1. Scale rather large; circuli more numerous than in balteatus; the more 

 central a})ical circuli distinctly angled, approaching the condition 

 of Sfmot'iius; radii numerous (13 to 1'^); peritoneum not or hardly 

 silvery, witli rather few irregularly jilaced spots, some (juite large, 



but not dark L. carhtorti Kendall. 



Cress bake. Thoroughfare, Alaine. 

 Scale rather small ; /;f/'/7o/u'?n?i silvery 7. 



7. Radii ft'w (8 to 10); lateral circuli about ;'>0 on each side; peritoneum 

 silvery, nearly as in neogicus, but witli more diffu.se large brownish 



spots L. egreffius (Cirard). 



Willow Creek, Honey Lake Basin, Calif. 

 Kadii more numerous ( 10 to b!); peritoiicuvi silver, with black spots 



on ujipcr jiart Jj. neoguus (Cope). 



P^agle Lakes, INIaiiu'. 

 Radii most numerous ( 15 to 20), but only about 10 coiui)lete; circuli 

 about 20 on each side; peritoneum, silver, with many spots, mostly 

 reddish-brown, some black, none large, the general effect not dark, 



though the spots are numerous X. margarita (Cojie). 



Cemetery Creek, Watertown, N. Y. 



In a general way, the above arrangement is supposed to correspond 

 more or less with the lines of evolution of the species, the more primitive 

 ones coming fir.st. On the whole the subgenera recogni/e<l by Jordan 

 and Evermann are supported by the scale characters, with the exce})tit)n 

 of Ij. orcutd, w4iich is out of place in Phoxinus, or at any rate is (juite 

 unrelated to margarita and neogirus. (The latter is supposed to be gen- 

 uine Phoxitiun. ) 



