230 Bulletin 47, United States National Museum. 



c. Caudal peduiu-le very deep and compressed, its least depth nearly equal to depth of 

 head; dorsal inserted above ventrals; scales comparatively large and well imbricated, 

 about 5G. ;rassicauda, 363. 



TiGOMA, (a coined name): 

 cc. Caudal peduncle not very stout, its least depth not % depth of head ; scales jmall, 

 not closely imbricated ; dorsal usually inserted behind ventrals. 

 d. Scales of medium size, TjO to 75 in the lateral line ; young with the head more 

 or less conical ; adults with the head tlattened and the back elevated, 

 e. Species from the Sacramento Basin ; scales large, about 52. 



CONFOBMIS, 364. 



ee. Species from the great basins of Utah, Nevada, Idaho, and Oregon; scales 



rather large, 53 to 03. 



/. Sides of body abruptly silvery from a line just above lateral line; scales 



i;j_G0-7. BicoLon, 305. 



jr. Sides of body scarcely silvery, the scales everywhere much dotted; head 



Bubconical; eye small; form extremely variable. lineatus, 306. 



eee. Species from the basin of the Rio Grande; mouth large; head large; teeth 



extremely variable; scales 00 to 07. nicuescens, 367. 



ecee. Species from the basin of Rio Yaijui ; scales 02 ; body robust. 



PUKPUREUS, 308. 



eeeee. Species from the Gila basin ; liead more blunt ; scales 73 to 75 ; body 

 rather elongate. intermedius, 369. 



del. Scales very small, 80 in the lateral line. 



g. Head depressed above; back elevated with age; species of large size; 

 from the Gila Basin. niuer, 370. 



gg. Head not depressed ; the back not elevated ; species of small size, from 

 the Great Basin of Utah. ALici.Ti, 371. 



6ft. Anal basis long, of 9 to 22 rays, the flns all high; body more or le.ss compressed; 

 head bluntish, with large eye ; scales moderate, not closely imbricated, 55 to 65 in 

 lateral line. 

 CiiEONDA, (a coined name): 

 h. Anal rays 9 to 13, usually 11. 



i. Coloration plain ; body not much compressed. cooperi, 372. 



it. Coloration not plain ; sides with a dark lateral band, or with two dark bands; the 

 interspace and the belly bright red in spring males. 

 j. Body very deeji, the depth 3 in length. HUMBOi.nTi, 373. 



jj. Body moderately elongate, the depth 4 to 4)^ in length ; cheek with a silvery or 

 golden crescent ; a pale streak from gill opening above eye. 

 k. Anal rays usually 9 or 10 ; two dark lateral stripes. egregius, 374. 



kic. Anal rays usually 11 or 12 ; one dark lateral stripe, forking anteriorly. 



HYDROPHLOX, 375. 



Richardson lus, (named for Sir John Richardson): 



/(/). Anal rays 14 to 22, usually 16 ; body much compressed ; a dark lateral stripe ; crescent 

 on cheek very distinct. balteatus, 370. 



Ci.iNOSTOMUS, (/cAiVu, to incline ; aroixa, mouth): 



0(1. Mouth very wide, the lower jaw much projecting beyond upper ; upper lip on the level of 

 tho middle of the pupil ; maxillary reaching to below the pupil ; body elongate, com- 

 pressed ; dorsal well back ; males with red pigment, often brilliantly colored. 



I. Scales moderate, 50 to 55 in lateral line. vandoisulus, 377. 



II. Scales minute, 63 to 70 in lateral line. elongatus, 378. 

 II. Lateral lino more or less incomplete ; small species, the males usually brilliantly colored, 



the sides and belly red in spring. 

 Phoxini'S, {(/>o{ii'os, minnow; from (/lo^o;, tapering; the old name of the European "minnow," 

 Lencincus i^hnximm): 

 m. Scales minute, SO to 10(1 in a longitudinal series ; lateral line very short ; snout blunt. 



NEOd.KUS, 370. 



Hemitkemia, (r|/u.i-, half; rpfifxa, aperture = lateral line): 

 mm. Scales moderate <ir large, 40 to 00 in a longitudinal series; lateral lin(> variously devel- 

 oped, sometimes almost complete. 



