ZOOLOGY FISHES 89 



Insertion of ventrals nearer the extremity of the snout than the base of the caudal. Scales moderate. Greenish brown above ; 

 yellowish or whitish beneath, sometimes with small scattered black spots. Fins greyish olive. 



196. Mercede river, California. Dr. A. L. Heermann. 



197. Mohave river, California. Dr. A. L. Heermann. 



34. LAVINIA EXILICAUDA, B. & G. 

 GEN. KEP. 241. PLATE LIV, FIGS. 14. 



SPEC. CHAR.- Body very compressed, quite deep upon its middle ; peduncle of tail rather slender. Head small ; eye moderate ; 

 posterior extremity of maxillary not reaching the anterior rim of the orbit. Isthmus small. Insertion of ventral fins situated 

 in advance of the anterior margin of the dorsal. Pectorals rather small. Caudal deeply furcated. Reddish brown above, 

 silvery grey on the sides, the scales being minutely dotted upon their margin. Beneath yellowish. 



207. Sacramento river, California, Dr. A. L. Heermann. 



208. Posa creek, California. Dr. A. L Heermann. 



35. POGONICHTHYS INAEQUILOBUS, B. & G. 



GEN. REP. 245. PLATE LVI, FIGS. 14. 



SPEC. CHAK. Head forming a little less than the fifth of the total length; snout rounded, sub-conical, thickish ; gape of 

 mouth nearly horizontal ; lower jaw shorter than the upper. Posterior extremity of maxillar bone scarcely even with a vertical 

 jine drawn in front of the orbit Anterior margin of dorsal fin somewhat nearer the extremity of the snout than the insertion 

 of the caudal. Insertion of ventrals placed posteriorly to the anterior margin of the dorsal ; their origin being nearly equidistant 

 between the extremity of the snout and the base of the caudal. Lobes of the caudal fin unequally developed ; upper one the 

 longest. Greyish brown above ; yellowish beneath. 



182. San Joaquin river, California. Dr. A. L. Heermann. 



36. POGONICHTHYS SYMMETBICUS, B. & G. 



GEN. REP. 246. 



SPEC. CHAR. Head constituting the fifth of the total length. Snout rounded and sub-conL al. Gape of mouth somewhat 

 arched; lower jaw shorter than the upper. Posterior extremity of the maxillary corresponding to a vertical line drawn behind 

 the nostrils. Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. Insertion of 

 ventrals placed in advance of the anterior margin of the dorsal, and somewhat nearer the insertion of the caudal than the tip 

 of the snout. Lobes of caudal fin equally developed. Dark greyish brown or blackish above ; yellowish golden beneath. 



191. Fort Miller, San Joaquin valley, California. Dr. A. L. Heermann. 



37. LUXILUS OCCIDENTALS, G r d . 

 GEN. REP. 280. 



SPEC. CHAR Body rather elongated, sub-fusiform in its outline. Head constituting about the fifth of the total length. 

 Snout sub-conical, rather tapering. Gape of the mouth oblique. Posterior extremity of maxillar bone extending to a vertical 

 line which would intersect the hind nostril. Eye large and circular ; its diameter entering four times in the length of the side 

 of the head. Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. Origin of 

 ventrals nearer the insertion of the caudal than the extremity of the snout. Anterior edge of anal fin equidistant between the 

 isthmus and the tip of the lower lobe of the caudal. Dark greyish browu above; yellowish beneath, speckled with grey. 



57. Posa, or 0-co-ya, creek, California. Dr. A. L. Heermann. 58 and 59. Four Creeks, 

 Tulare valley. Dr. A. L. Heermann. 

 12 S 



