246 bulletin 4'/, United States National Mjiseum. 



of Nevada (LakeLahoutan,) anHpulverulentus (=j)arovrtWJts), from the basin 

 of Utah (Lake Bouneville). In general the fish faunsB of the basins of 

 Nevada and Utah are entirely distinct. But we know of no constant char- 

 acters on which a division of this species can be maintained, {symmetri- 

 cus, symmetrical; it being supposed to differ from Pof/onichthys macrolepi- 

 dotus in the symmetrical tail.) 



PogonUhthys siimiiiclriciis,* Baied & Gibard, Proc. Ac. Nat. Sci. Phila., 1854, 136, Fort Miller, 



San Joaquin Valley. (434 inclies long). 

 AhjniiSfu foniiosa, GlKARD, I'roc. Ac. Nat. Sci. Phila., 1856, 183, Merced and Mohave rivers. 



(51^ inches). (Type, Nos. 2754 and 2755. Coll. A. L. rieermauu.) 

 Algaiisea obesa,-\ Girard, Proc. Ac. Nat. Sci. Phila., 1856, 183, Humboldt River; GiitAitn, Pac. 



R.K.Surv.,x, 2,39, 1858. (Type, No. 2752. Coll. Lieut. Beckwith.) 

 Myloli'iH-nn piiInniU-uliis,l Cope, Ilayden's Geol. Surv. Montana for 1871, 475, 1872, Warm 



Springs, Utah. (Scales 13-58-9.) 

 Mi/loleiicus jwraratms, CoPE, Proc. Amer. Philos. Soc. Phila., 1874, 136, Beaver River, Utah ; 



Cope, Zoiil. Whteler Surv. , v, 669, 1875, (1876); Cope, Proc. Ac. Nat. Sci. Phila., 1883, 143. 

 Lexicosomus aymmelricns, Gunther, Cat., vii,267, 18C8. 

 Ceratichthyg si/mmetricus, Jordan & Gilbert, Synopsis, 213, 1883. 

 Leucisms fonnosits, Gunther, Cat., vii, 24.5, 1868. 



Leucos fonnosa, Jordan & IIenbhaw, Beport Chief Engineer,s, App. NN, 193, 1878. 

 Leuctts formosiis, Jordan & Gilbert, Synopsis, 244, 1883. 

 Leuciscjis ohems, Gunther, Cat., vii, 244, 1868. 



Leucos obesiis, Jordan & Henshaw, Report Chief Engineers, App. NN, 192, 187S. 

 Leums obesiis, Jordan & Gilbert, Synopsis, 245, 1883. 



* The type of Pogoiiicliihyx syniiiielriciis has no barbel; the teeth 4-5; the head 4 in length; the 

 depth 4^; scales 9-53-6. It seems to be the same species as Algausea fonnosa, which has scales 

 10-57-7. The type specimen of Algami-a formoxaCi^o. 196), from Merced River, is 5J^ inches long. 

 Head 3g; depth (eviscerated) i}/^! Eye 5, 1^;, in snout. Snout 4 in head. Mouth terminal, 

 oblique, about as in No. 193, but the lower jaw slightly included. Maxillary not reaching eye. 

 D. 8; A. 8. Scales 10-57-7. Another of these specimens has the snout shorter and a little more 

 pointed. Scales 11-57-7. The type from Mojave River (No. 107), i]/^ inches long, has head 3J^; 

 depth 4. Eye 4^4, shorter than snout, which is pointed, 4 in head. Mouth oblique; lower jaw 

 slightly projecting. D. 8; A. 8. Scales 11-51-7. This form from Mojave Riverseemsto cor- 

 respond with specimens from tributaries of Owen Lake, Inyo County, California. These differ 

 from typical symmetricns in the form of the head, agreeing in this respect with the types of ohi-sns 

 and pariwatiiis. The snout in the Inyo County specimens is shorter, barely equal to the eye and 

 not convex as in syiuiiietriciis; mouth very oblique; dorsal over ventrals. Scales 10-55-6. These 

 may be the same as 7i'. jmrovanuf:, the figure of which shows this form of mouth. Riitiliis parovwms 

 is thus described: Body rather stout; muzzle short, conical; mouth very broad, the maxillary 

 reaching front of orbit; profile gently arched; eye large, 3 in head, equal to interorbital width; 

 pectorals reaching little more than half way to ventrals; the latter just to vent. Translucent, 

 with a plumbeous lateral band. Ventrals and pectorals dusky; dorsal and caudal shaded with 

 dark. Head 31^; depth 41-4. D. 9; A. 8. Scales 10-48-5; teeth 4-5. Length 12 inches. (Cope.) 

 Beaver River, Utah, a tributary of Sevier River. 



t R. ohesns is apparently identical with BuUbts symmetricns. Body stout ; head short; snout 

 4 in head, moderately pointed, not much convex. Mouth oblique, lower jaw not projecting; 

 maxillary not reaching eye. Head 3}^; depth 3J^; eye 5, li., in snout. Scales 12-.57-8. Length 

 634 inches. Here described from notes on Girard's type (No. 194, U. S. Nat. Mus.) from Hum- 

 boldt River. 



Another of Girard's specimens (No. 193, U. S. Nat. Mus.) from Humboldt River is 6% inches 

 long. Head 35^; depth 3li(. Eye 5 in head, 13^ in snout, which is 3| in head. Mouth terminal, 

 oblique, the lower jaw scarcely projecting; maxillary not reaching eye; snout pointed. Scales 

 14-58-8. l>. 9; A. 8. 



Another'specimen from Nevada, 5 inches long, has snout a little longer than eye; scales 11- 

 56-6; depth 4. Still another, 83^ inches long, from "Camp 21, Nevada," has scales 12-54-6; 

 snout not decurved; eye 13^ in snout. Of specimens from Truckee River, one has a convex snout 

 very pronounced; another the snout slightly convex, the two others not convex at all. 



X Hryhli'iiai>i pulreriilentus is thus described: Form stout; head short, muzzle not decurved; 

 mouth terminal, slightly descending, the maxillary bone nearly attaining the anterior line of 

 the orbit. Head 3.75 times in length, exclusive of caudal; depth 3% times. Eye 4.2 in head, 

 linmuzzle. Preorbital bone deeper than long. Scales 13-58-9. Radii: D. I, 0; A. II, 7. Caudal 

 well forked. Length 3} 2 inches. A dark plumbeous band extends from the origin of the lateral 

 line above to the caudal i)ccliincle .and on it to the caudal fin; below this the color is silvery, 

 thickly dusted with black dots; above it is au olive-yclluw band, then a dark dor.sal region, all 

 dusted; sides of head silvery, dusted; fins unspotted. Numerous specimens from the Warm 

 Springs, Utah. 



