178 U.S. NATIONAL MUSEUM BULLETIN 282 



Type.— The holotype (UMMZ 165843) is a male, 66.9 mm. in 

 standard length. It has 5+9=14 anal rays, 20+7+9+14=50 caudal 

 rays, and six soft dorsal rays. There are ten pelvic rays on the left and 

 nine on the right side. On each side there are eight soft pectoral rays, 

 two internasal pores, eleven preoperculomandibular pores, and seven 

 serrae on the posterior edge of the pectoral spine. The anterior serrae 

 of the pectoral spine are prominent and numerous. The humeral proc- 

 ess is long. The body form and pattern are shown in the figures (pi. 

 16, fig. 1; pi. 18, fig. 1). The head length is stepped into the standard 

 length 3.35 times; the distance from the adipose notch to the tip of the 

 caudal fin is stepped into the distance from the dorsal origin to the 

 adipose notch 1.95 times. Other measurements are given in table 28. 



Distribution. — Noturus stigmosus (map 13) is found in the trib- 

 utaries to the Mississippi River in western Tennessee and in the Ohio 

 River system from the Shenango River, Pennsylvania, through Ohio 

 to the Wabash River, Indiana, and the Green River, Kentucky. It is 

 not known from either the Tennessee or Cumberland River systems. 

 After the Wisconsin glaciation, it undoubtedly used the Maumee out- 

 let to gain access to the western part of the Lake Erie basin, where it 

 occurs in the Detroit, Huron, and Maumee Rivers. It is typically 

 found in large streams or rivers. 



Variation. — A study of data obtained from Noturus stigmosus 

 throughout its range reveals no geographic trends; specimens from the 

 Great Lakes basin appear not to differ materially from Ohio VaUey or 

 western Tennessee fish. 



The following summarized data includes number of tabulations, 

 range of variation (in parentheses), and mean; several samples have 

 been grouped as follows: (a) Shenango River, Pennsylvania, (b) 

 Muskingum River, Ohio, (c) Shade Creek and Scioto River, Ohio, (d) 

 Miami and Whitewater Rivers, Ohio, (e) Salt River, Kentucky, (f) 

 Wabash River, Indiana, (g) Great Lakes basin, (h) western Tennessee, 

 and (i) total. 



Preoperculomandibular pores: (a) 68 (9-12) 10.84; (b) 121 (8-12) 

 10.94; (c) 72 (9-12) 10.93; (d) 6 (10-11) 10.83; (e) 10 (10-11) 10.80; 



(f) 12 (9-12) 10.75; (g) 38 (10-12) 10.79; (h) 14 (10-11) 10.93; (i) 

 341 (8-12) 10.89. 



Pelmc rays: (a) 70 (8-10) 9.23; (b) 122 (8-10) 9.08; (c) 22 (9-10) 

 9.14; (d) 6 (9-10) 9.33; (e) 6 (9-10) 9.17; (f) 12 (9-10) 9.08; (g) 58 

 (9-10) 9.14; (h) 14 (9-10) 9.21; (i) 310 (8-10) 9.14. 



Soft pectoral rays: (a) 68 (7-8) 7.94; (b) 122 (7-8) 7.65; (c) 22 (7-8) 

 7.95; (d) 6 (8) 8.00; (e) 6 (7-9) 7.83; (f) 12 (7-8) 7.42; (g) 38 (7-8) 

 7.63; (h) 14 (8-9) 8.07; (i) 288 (7-9) 7.76. 



Analrays: (a) 35 (13-16) 14.49; (b) 61 (13-16) 14.34; (c) 11 (13-15) 

 14.09; (d) 3 (15-16) 15.67; (e) 3 (13-15) 14.00; (f) 6 (13-15) 14.17; 



(g) 27 (13-16) 14.44; (h) 7 (13-15) 14.00; (i) 153 (13-16) 14.37. 



