PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 64. 



Proportional measurements and scale counts of 11 specimens of Pantosteus 



delphinus. 



Rio Florida-Durango. 



Uncompahgre-Montrose. 



Length of body (millimeters) 



Length of head 



Depth of body 



Depth of caudal peduncle 



Length of caudalpeduncle 



Length of snout 



Diameter of eye 



Interorbital width 



Depth of head 



Snout to occiput 



Snout to dorsal 



Snout to ventral 



Length base of d orsal 



Length base of anal 



Height of dorsal 



Height of anal 



Length of pectoral 



Length of ventral 



Length of caudal 



D orsal rays 



Anal rays 



Scales lateral series 



Scales above lateral line 



Scales below lateral Une 



Scales before dorsal 



191 

 0.21 

 .20 

 .065 

 .16 

 .125 

 .03 

 .09 

 .14 

 .185 

 .51 

 .57 

 .16 

 .075 

 .165 

 .20 

 .19 

 .15 

 .23 

 11 

 7 

 109 

 20 

 17 

 57 



200 

 22 

 .19 

 .07 

 .17 

 .125 

 .03 

 .095 

 .145 

 .195 

 .515 

 .56 

 .14 

 .07 

 .17 

 .18 

 .18 

 .15 

 .215 

 11 

 7 

 108 

 21 

 17 

 56 



195 

 0.22 

 .20 

 .07 

 .16 

 .13 

 .03 

 .09 

 .14 

 .14 

 .51 

 .585 

 .14 

 .08 

 .185 

 .20 

 .19 

 .15 

 .23 

 10 

 7 

 105 

 21 

 17 

 55 



173 



0.205 

 .23 

 .07 

 .17 

 .115 

 .035 

 .095 

 .145 

 .20 

 .50 

 .55 

 .155 

 .085 

 .165 

 .22 

 .215 

 .17 

 .23 

 11 

 7 



110 

 21 

 19 

 56 



175 

 0.22 

 .22 

 .075 

 .16 

 .125 

 .035 

 .10 

 .15 

 .21 

 .51 

 .58 

 .145 

 .075 

 .18 

 .235 

 .205 

 .16 

 .225 

 11 

 7 

 109 

 22 

 17 

 55 



185 



0.225 

 .21 

 .075 

 .165 

 .13 

 .03 

 .095 

 .14 

 .205 

 .51 

 .57 

 .14 

 .07 

 .185 

 .22 

 .20 

 .17 

 .24 

 11 

 7 



109 

 23 

 18 

 55 



205 

 0.21 

 .20 

 .075 

 .16 

 .11 

 .03 

 .095 

 .14 

 .18 

 .51 

 .575 

 .13 

 .075 

 .165 

 .18 

 .185 

 .15 

 .21 

 10 

 7 

 107 

 24 

 19 

 61 



175 

 0.22 

 .21 

 .07 

 .16 

 .115 

 .03 

 .10 

 .15 

 .18 

 .52 

 .60 

 .135 

 .08 

 .17 

 .20 

 .195 

 .155 

 .23 

 11 

 7 

 106 

 23 

 20 

 59 



205 

 0.20 

 .19 

 .075 

 .15 

 .11 

 .03 

 .10 

 .15 

 .17 

 .51 

 .58 

 .135 

 .08 

 .165 

 .185 

 .20 

 .16 

 .22 

 10 

 7 

 105 

 24 

 19 

 63 



220 



0.195 

 .19 

 .07 

 .17 

 .11 

 .03 

 .095 

 .14 

 .17 

 .49 

 .56 

 .13 

 .08 

 .17 

 .20 

 .20 

 .17 

 .22 

 11 

 7 



109 

 24 

 20 

 63 



202 



0.21 

 .22 

 .07 

 .15 

 .115 

 .03 

 .10 

 .14 

 .18 

 .52 

 .57 

 .14 

 .08 

 .165 

 .19 

 .18 

 .155 

 .215 



10 



7 



105 



23 



18 



57 



As previously noted, P. virescens was found in considerable num- 

 bers in Weber and Bear Rivers. When compaCt'ed directly with the 

 type, these fishes differ in no way, many specimens from Weber 

 River be ing exact counterparts, even in size and general appearance. 

 An examination of a series of specimens resulted in the following 

 scale counts: 



Scales in lateral series 90 91 92 93 94 95 96 97 98 99 100 



Number of specimens 1144 10 10 6672 3 



Scales occiput to dorsal 49 50 51 52 53 54 55 56 57 58 



Number of specimens 159 10 887233 



Scales above lateral line 18 19 20 21 22 23 



Number of specimens 1 3 17 15 16 2 



Scales below lateral line 12 13 14 15 16 17 



Number of specimens 5 8 19 16 3 3 



The anterior lip has 4 or 5 rows of papillae, the outer ones being 

 very small. The posterior lip is deeply incised. It is separated from 

 the anterior or upper, on either side, by a pronounced notch, behind 

 which the lobe is angular and pointed. There are about 15 series 

 of papillae which are not disposed in rows. The pectoral fins are 

 bluntly pointed, the edge of the dorsal concave, the caudal deeply 

 concave, or rather sharply notched in some specimens. There are 

 36 to 40 gillrakers on the first arch. The crania of many specimens 

 were examined, and in no case was the fontanelle found to be closed. 



In the appended table, measurements of mature examples from 

 Weber River are given. In smaller examples, 145 to 180 millimeters 

 in length, the body is deeper, 0.19 to 0.23 of the length; the caudal 



