36 ON THE ZOOLOGICAL POSITION OF TEXxiS. 



(lifters from tliat of most otlier species in having the superior distal angle 

 somewhat produced, while the corresponding lower angle is obliquely 

 truncate. The intermediate border is scarcely emarginate when spread 

 out. Other characters are as follows : Head flat, one-fifth longer than 

 wide ; greatest gape of mouth equal half length of head from dorsal spine, 

 omitting soft upper lip. Length of head 3| times in total, minus caudal 

 fin ; length of base of anal fin the same. Pectoral spine finely serrate 

 posteriorly, more than half as long as head ; dorsal spine long, smooth, 

 a little shorter than i)ectoral, its base a little nearer end of muzzle than 

 origin of adipose fin. It is separated by a wide space fi'om the supra- 

 occipital crest. Longest anal rays one-half as long as head. Brauchi- 

 ostegal rays 9. 



Color light or dark olivaceous above ; below, with mental barbels, 

 yellow or white in spirits. Length of specimens 6 inches. 



The only species besides the A. natalis with which to compare this 

 species is the A. erebennus Jordan. From this species it differs in many 

 X)oints. 



Little Wiciiita Eiver, Northern Texas. It is dedicated to the weJl- 

 known naturalist Jacob Boll, who discovered it. 



PelodicMhys olivaris Eaf. The Trinity, at Fort Worth and Dallas. 



PLECTOSPONDYLL 



Myxostoma macrolepidotum Les. This Texan representative of the "red 

 horse," var. duquesnei, was found to be common in the Guadaloupe and 

 Llano Elvers. It may prove to be but a geographical race or sub- 

 species, as I find no other difference between the two than a rather larger 

 number of scales in the Texan form. They number 6-45-5 in the latter; 

 in var. duquesnei 5-42-4, a slight difference, but more imi)ortant in this 

 genus than in manj^ others. Eadii : D. 1-12; V. 9. 



Campostoma anomalum Eaf., subspecies or var. pullum Ag. I found 

 the small form of this species common at Helotes, on the Upper Medina, 

 and in Comanche Creek, at Mason. 



Hijhognathus flavipimiis sp. no v. This species belongs to the second 

 division of the genus, as defined in my Fresh Water Fishes of North 

 Carolina (Proceed. Amer. Philos. Soc, 1870, p. 466) by the narrow sub- 

 orbital bones and the inconspicuous speculum of the postfrontal re- 

 gion, tlie tyi)e of which is the H. argi/ritls. The present fish differs from 

 that one in the smaller scales and quite distinct coloration. Formulae : 



