80 U.S. NATIONAL MUSEUM BULLETIN 282 



Aside from the peculiar pore counts of populations in the Red River 

 system, the gradients in meristic characters appear to be slight. The 

 following data are arranged in the sequence: number of tabulations, 

 range (in parentheses), and mean by drainage. 



Vertebrae: San Jacinto R., Texas 8 (35-37) 35.75; Neches R., Texas 

 2 (37) 37.00; Red R., Oklahoma and Louisiana 24 (35-38) 37.04; 

 Ouachita R., Louisiana 16 (36-38) 36.56; Arkansas R., Oklahoma 11 

 (35-37) 36.09; Black R., Missouri 1 (38) 38.00; Cache R., Illinois 14 

 (36-37) 36.57; Alabama R., Alabama 7 (36-37) 36.86; total 83 (35-38) 

 36.61. 



The following data, in the same sequence, are combined from broad 

 geographic areas: (a) Texas, (b) Red River system, Oklahoma, (c) 

 Red River system, Louisiana, (d) Arkansas River system, Oklahoma 

 and Kansas, (e) Ouachita River system, (f) Mississippi River drainage 

 above Arkansas River, (g) tributaries to Gulf of Mexico between 

 Mississippi and Mobile Rivers, (h) Mobile River drainage, (i) total. 



Pelvic rays: (a) 56 (8-10) 9.02; (b) 30 (8-9) 8.93; (c) 24 (9-10) 9.13; 

 (d) 46 (9-10) 9.17; (e) 44 (9-10) 9.05; (f) 62 (8-10) 8.98; (g) 44 (8-10) 

 9.00; (h) 20 (9-10) 9.15; (i) 326 (8-10) 9.04. 



Soft pectoral rays: (a) 54 (8-10) 9.06; (b) 30 (8-10) 9.23; (c) 22 

 (9-10) 9.23; (d) 46 (9-10) 9.30; (e) 44 (9-10) 9.11; (f) 63 (7-10) 8.98; 

 (g) 42 (9-10) 9.43; (h) 20 (9-11) 9.85; (i) 321 (7-11) 9.21. 



Analrays: (a) 22 (16-18) 16.95; (b) 19 (15-18) 16.68; (c) 12 (17-19) 

 18.00; (d) 12 (15-18) 16.50; (e) 24 (15-18) 17.13; (f) 32 (15-20) 16.97; 

 (g) 24 (16-19) 17.33; (h) 10 (16-18) 16.70; (i) 155 (15-20) 17.04. 



Lower-half caudal rays: (a) 22 (27-31) 28.50; (b) 14 (26-30) 27.64; 

 (c) 12 (28-31) 29.08; (d) 12 (27-30) 28.00; (e) 21 (26-29) 27.82; (f) 29 

 (26-30) 27.66; (g) 5 (28-30) 29.00; (h) 8 (27-29) 27.75; (i) 123 (26-31) 

 28.07. 



Upper-half caudal rays: (a) 22 (29-33) 31.00; (b) 14 (29-33) 31.00; 

 (c) 12 (31-34) 32.25; (d) 12 (28-33) 30.33; (e) 21 (29-33) 30.91; (f) 29 

 (29-34) 30.59; (g) 5 (30-33) 31.20; (h) 8 (29-32) 30.38; (i) 123 (28-34) 

 30.89. 



Total caudal rays: (a) 22 (56-64) 59.50; (b) 19 (55-62) 58.68; (c) 

 12 (59-64) 61.33; (d) 12 (56-62) 58.33; (e) 21 (56-62) 58.73; (f) 30 

 (55-63) 58.23; (g) 5 (58-63) 60.20; (h) 8 (56-60) 58.13; (i) 129 (55-64) 

 58.94. 



Preoperculomandibular pores: (a) 64 (10-11) 10.89; (b) 225 (9-12) 

 10.26; (c) 114 (9-11) 10.27; (d) 180 (9-12) 10.86; (e) 203 (9-12) 10.94; 

 (f) 54 (10-12) 10.80; (g) 52 (10-12) 10.92; (h) 20 (10-11) 10.95; (i) 

 916 (9-12) 10.66, including Calcasieu River, Louisiana 4 (11) 11.00. 



Preoperculomandibular pores in streams of Red River system: 

 Clear Boggy River, Oklahoma 63 (9-11) 10.30; Kiamichi River, 

 Oklahoma 12 (10-12) 10.33; Little River, Oklahoma 146 (9-11) 



