FISHES OF SACRAMENTO-SAN JOAQUIN BASIN. 139 
more imbricated. We have but a few small specimens of this form, the longest being but 3 inches long. 
They were taken in North Fork of Pitt River near Alturus and at mouth of Joseph Creek, several hundred 
miles from where any other specimens of symmetricus have been taken. The form may prove not to be 
symmetricus, but we can mot identify it otherwise with the material at hand. 
Locat DistrRrBuTiIon. 
Loeality. Stream or lake. Collector. Name as reported. | Authority. 
At mouth of Joseph Creek...) North Fork Pitt River..... Rutter & Cham- |} Rutilus symmetri- 
berlain. cus. | 
Near Alturus 
Redding 
RG Month ors -2- -ob 552-25. Clear Creek - 
United States hatchery...... Battle Creek... 5. --.-2.--- | meee 
Atmoauthiots.wesso a. -cc- ache Thomas Creek 
Pleasant Valley.-..........-. gee Fork Consumne 
iver. 
Baker Mords. cn -asons Tuolumne River...........- awe 
Near mouth of. .......-...... South Fork Tuolumne |....- 
iver. 
Parrot Memycecs.>-o-5 sd Stanislaus River.......... 
Bower Cave. .| North Fork Merced River. 
Benton Mill. Merced River. 
Livingston 
Algonsea formosa a Girard, 1856. 
Mariposii-~ ~~ ------=-=+------ Rutilus symmetri-_ 
cus. | 
soe GC eee 2 eee 
Loca dot eae ~ 
Pogonichthys sym- | Girard, 1854. 
metricus. 
IGantervyiles <2... --s—ens-n-=-~ REM SUIWOL = == Sees es Rutter & Atkin- | Rutilus symmetri- 
son. cus. 
St. John Channel. ........... KaweabRiver. -.-....222.).-0-. (ooo eres mean bast COM sada eee 
POPtARVillOs ese 2s ee ant = ee MulaiRivers 52-525. 22<2-—- hawt DOr ose ae oan eee does anes re 
Warn akon. oO) oe ne Henshaw......--- Leucos formosus ...| Jordan & Henshaw. 
17. Agosia robusta Rutter. 
Agosia robusta Rutter, Bul. U. S. Fish Comm., vol. xx11, collection 1902, p. 148, fig., Prosser Creek, Cal. 
Body heavy, highest at shoulder, ventral outline curved almost as much as dorsal; head large, 3.75 
to 4 in length; snout blunt, but little overlapping, and never projecting beyond the premaxillary; 
mouth oblique, barbels usually absent, present on 10 to 50 per cent of the specimens from any one 
locality; pectoral about equal to head behind nostril, variable; caudal moderately forked, length of 
middle rays two-thirds of outer; lateral line nearly always incomplete; scales 49 to 77, usually varying 
about 12 in one locality; usually 2 lateral stripes, the upper extending from snout to caudal, the lower 
branching off from the upper behind the head and ending along base of anal; cheeks abruptly silvery 
below lateral stripe. 
This species differs from nubila in the heavy body, blunt rounded snout, incomplete lateral line, 
and in the absence of scattered brown scales. It differs from carringtoni also in the heavy body and 
incomplete lateral line, and in the shorter pectorals, the anterior rays of anal scarcely or not at all extend- 
ing beyond posterior when fin is depressed, a greater development of rudimentary caudal rays which 
usually form short keels along caudal peduncle, and in the silvery stripe across cheeks. 
In the main Sacramento River and the lower portion of its tributaries there appears to be a more 
slender form, but our material is too meager for accurate determinations. The only adults are from 
Sacramento Riverat Sims. They have asmall head, 4.33 in body, the lateral line is complete, the scales 
69 to 77; the mouth is inferior, the snout projecting, and the maxillaries with barbels; the eye is 4.5 
in the head. Specimen 3.4 inches long. Young specimens similar to the young taken at Sims were 
secured in Battle Creek at the government fishery station, and in American River at Placerville. The 
Kings River specimens are more like the type of robusta. 
B. B. F. 1907—10 
