206 [September, 



1. TiGoMA PxiLCnEhtj&.. Gila puleheUa, B. & G, Pror. Acad. Nat. Sc. Philad. 

 Vii. 1854, 29. 



Prom Rio Mimbres, a tributary of Guzman Lake, Mex. John H. Clark. 



2. TiGOMA coNPORMis. Laviniaconformis, B & G. Proc. Acad. Nat. Sc. Philad. 

 vii. 1854, 137. 



From Posa Creek, San Joaquin Valley, Cal. Dr. A. L. Heermann. 



3. TiGOMA BicoLOR. 'A large species, the largest of the genus hitherto known 

 to us. It is twelve inches in total length, the head forming the fourth of it. The 

 greatest depth is nearly equal to the length of the head. The eye is subcircu- 

 lar, and its diameter contained about six times in the length of the side of the 

 head. The origin of the ventrals is situated but slightly in advance of the 

 dorsal. The latter is higher than long throughout the genus. The scales are 

 quite large. The dortal region is bluish grey ; the sides and belly are silvery 

 white, sometimes golden, but always in contrast with the tint of the back. 



Specimens of this species were collected in Tlamath Lake, 0. T., by Dr. John 

 S. Newberry, under Lt. Williamson, U. S. A. 



4. TiGOMA ruRPCREA. This is a much stouter fish than T. pulchella, which 

 it resembles in other respects ; but its head is larger and its body shorter. The 

 anterior margin of the dorsal is nearer the extremity of the caudal than the tip 

 of the snout, whilst in T. pulchella it is nearer to the snout than the extremity 

 of the caudal. The scales are also larger than in T. pulchella. The color is of 

 purplish black above and on the sides ; beneath yellowish. 



Collected at San Bernardino, in the upper waters of Rio Huagui, west of the 

 Sierre Madre, by Dr. C. B. Kennerly, under Major W. H. Emory. 



5. TiGOMA INTERMEDIA. Intermediate between T. pulchella and T. purpurea, 

 more closely related however to the former than to the latter. The fins are 

 much less developed, the inferior fins especially are quite small. 



Collected in the Rio San Pedro, of the Gila, by John H. Clark, under Col. J. 

 D. Graham, U. S. A. 



6. TiGOMA OBESA. A very characteristic species by its short and deep body, 

 its short and conical head, and its small fins. It bears a general resemblance 

 to T. purpurea, but its head is much smaller. Color of dorsal region bluish 

 grey ; upper half of sides dotted, lower half unicolor and yellowish white like 

 the belly. 



Specimens of this species were collected in Salt Lake Valley by J. Soule 

 Bowman. 



7. TiGOMA HUMBOLDTi. Rcsemblcs T. obesa by a deep and rather short body, 

 but the latter is covered Avith much larger scales. The head and eyes are also 

 much larger. The dorsal region above the lateral line is bluish or greyish 

 black and so the upper surface of the head. The rest is red and golden, except 

 a narrow blackish streak below the lateral line, extending from the thoracic 

 belt to near the anal fin. 



Collected in Humboldt river by J. Soule Bowman, and Lt. E. G. Beckwith, 

 U. S. A. 



8. TiGOMA LiNEATA. The general aspect is elongated, the body being subfu- 

 siform, and the head small and conical, constituting a little less than the fourth 

 of the total length. The ground color is yellowish ; the centre of the scales 

 of the upper regions being black, the back and upper half of the flanks ap- 

 pear as if marked with alternate lines of black and yellow. 



Specimens of this species were likewise collected by Lt. E. G. Beckwith. 



9. TiGOMA GRACILIS The body is elongated and compressed, subfusiform, re- 

 sembling T. lineata, but the head is more elongated. The ventrals are inserted 

 but a little in advance of the anterior margin of the dorsal, whilst they are more 

 so in T. lineata. In the latter the pectorals are short and broad ; in the present 

 species they are narrow and elongated. The scales are smaller than in T. 

 lineata. Bluish grey above and on the sides ; yellowish beneath. 



