584 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



The paratypcs exhibit some variation, as illustrated in the annexed 

 table. The pores of the lateral line fail to develop on occasional 

 scales, especially on the caudal peduncle. 



Notropis meamsi. — Measurements of type and paratypes. 



Length of body mm.. 41 40 35 



Lengthhead 0.26 0.25 0.255 



Depth body 27 .28 .28 



Depth caudal peduncle 10 .10 .11 



Length caudal peduncle 21 .25 



Length snout 06 .07 .07 



Diameter eye 065 .065 .07 



Interorbital width 075 .085 .085 



Depth head 19 .18 .19 



Snout to occiput 21 .20 . 21 . 



Snout to dorsal 55 .58 .55 



Snout to ventral 50 .50 .51 



Length base of dorsal 12 .13 .14 



Length base of anal 115 .13 .12 



Heightdorsal 20 .21 .21 



Height anal 17 .16 .19 



Length pectoral 19 .20 .22 



Length ventral 17 .14 .17 



Length caudal 26 .27 



Doisal rays 8 8 8 



Anal rays 8 9 9 



Scales lateral line 40 37 38 



Scales above lateral line 8 8 8 



Scales below lateral line 5 4 4 



Scales before dorsal 19 18 17 



AGOSIA CHRYSOGASTER Glrard. 



The teeth of 10 specimens were examined and found to have a 

 well-developed grinding surface. They were sharp and distinctly 

 hooked at the tips. There were 4 on each side. The fins are unusually 

 short and rounded in some cases, the ventrals not reaching the anal 

 opening. Tubercles are present on the heads of the males taken in 

 January, and the females contain many eggs in various stages of 

 development, some very large, apparently ripe. The peritoneum is 

 dark; almost black. 



Doctor Mearns observes of the color: 



Blackish above, greenish olive on the sides, and white below. Steel-blue reflections 

 on sides of head. 



Sonoyta River. 



PLAGOPTERUS ARGENTISSIMUS Cope. 



Three specimens of this interesting spined minnow bear rudi- 

 mentary scales on the anterior dorsal parts of the body. On the 

 throat, just posterior to the lower lip, is a mass of papillae like those 

 on the lips of Catostomus. 



GUa River, near Gila City. 



