48 ZOOLOGY. 



riorly to the anterior margin of the dorsal, their tips reaching the vent. Scales moderate. Reddish brown above, spotted with 

 black; greyish beneath. Soft portion of dorsal and anal fins provided with a black patch. 



375. Tributary of Gypsum creek, Canadian. H. B. Mollhausen. 



6. CALLIURUS LONGULUS, Grd. 

 GEN. REP. 16. PLATE V, FIGS. 58, and PLATE VI, FIGS. 58. 



SPEC. CHAR. Mouth moderate; gape oblique upwards. Posterior extremity of maxillary extending to a vertical line inter 

 secting the pupil. Eyes moderate. Insertion of ventrals situated opposite the inferior edge of the base of the pectorals and 

 posteriorly to the origin of the dorsal, their tips extending to the vent. Scales moderate. Reddish brown above; greyish 

 beneath. Soft portion of dorsal and anal fins provided with a black patch. 



407. Rio Seco, Texas. Dr. C. B. Kennerly. 



7. CALLIURUS MICROPS, Grd. 

 GEN. REP. 17. PLATE IV, FIGS. 58. 



SPEC. CHAR. Mouth moderate ; gape oblique upwards. Posterior extremity of maxillary extending to a vertical line drawn 

 midway between the anterior rim of the orbit and the pupil. Eye small. Insertion of ventrals situated posteriorly to the base 

 of pectorals and the origin of the dorsal ; their tips not reaching the vent. Scales moderate. Reddish brown above, with 

 centre of scales lighter ; greyish beneath. Soft portion of dorsal provided with a black patch. 



413 and 414. Rio Brazos, Texas. Dr. George G. Shumard. 



8. BRYTTUS ALBULUS, Grd. 

 GEN. REP. 19. PLATE VI, FIGS. 14. 



SPEC. CHAR. Body sub-elliptical, rather contracted and deep. Nape convex, and snout sub-conical. Posterior extremity 

 of maxillary extending to the anterior rim of the orbit. Insertion of ventrals situated posteriorly to the base of the pectorals 

 and the anterior margin of the dorsal; their tips overlapping the vent. Scales rather large. Pale reddish brown, lighter 

 beneath than above. Fins greyish olive ; dorsal with a black patch. 



421. Rio Blanco, Texas. Dr. C, B. Kennerly. 



9. BRYTTUS SIGNIFER, Grd. 

 GEN. REP. 20. PLATE VII, FIGS. 58. 



SPEC. CHAR. Body contracted and deep. Nape convex, and snout sub-conical. Posterior extremity of maxillary extending 

 to a vertical line drawn in advance of the pupil. Insertion of ventrals situated posteriorly to the base of pectorals and the 

 origin of dorsal, their tips overlapping the vent. Scales mo.derate. Eeddish brown, lighter beneath than above ; dorsal and 

 anal fins provided with a black patch. 



422. Rio Medina, Texas. Dr. C. B. Kennerly. 



10. BRYTTUS HUMILIS, Grd. 

 GEN. REP. 21. PLATE VII, FIGS. 924. 



SPEC. CHAR Body sub-elliptical. Nape convex, and snout sub-conical. Posterior extremity of maxillary extending beyond 

 the anterior rim of the orbit. Insertion of the ventrals situated posteriorly to the base of pectorals, and a little in advance 

 of the origin of the dorsal, their tips overlapping the vent. Scales large. Eeddish brown or dusky, maculated. Fins unicolor; 

 dorsal sometimes blotched. 



423428. Near Rock Mary, Old Fort Arbuckle, Sugar-loaf creek, Arkansas. H. B. Moll 

 hausen. 



