180 U.S. NATIONAL MUSEUM BULLETIN 282 



rivers with shifting bottom and it is not normally a resident of small 

 streams or creek-like habitats. In the Huron River, Michigan, scat- 

 tered specimens were found in clear water in an area of moderate to 

 fast current over mixed gravel, sand, and marl and some vegetation, 

 but they were most numerous and apparently concentrated on a riffle 

 (the type-locality) of large, irregular stones over which a swift current 

 flowed. At this riffle, they were commonly taken with Noturus jlavus. 

 Noturus stigmosus has been taken in collections containing the fol- 

 lowing Noturus: gyrinus, phaeus, Jlavus, hildebrandi lautus, elegans, 

 trautmani, eleutherus, and miurus. 



Noturus munitus Suttkus and Taylor 



FRECKLEBELLY MADTOM 

 Plates 4 (fig. 10), 16 (fig. 2), 18 (fig. 2); Map 13 



Noturus munitus Suttkus and Taylor, 1965, pp. 169-178, figs. 1-3 (original descrip- 

 tion; ecology; localities in Pearl, Tombigbee, and Cahaba Rivers). — Suttkus 

 and Ramsey, 1967, p. 140 (in associations with Percina aurolineata, three 

 Cahaba R., Alabama localities). 



Type-specimens.— TU 26250 (holotype), TU 11311 (196 para- 

 types), ANSP 102047 (10 paratypes), BMNH 1964.12.24.1-10 (10 

 paratypes), CNHM 72742 (10 paratypes), CU 47676 (25 paratypes), 

 MCZ 43090 (10 paratypes), MNHN 1964-584 (5 paratypes), SMF 

 7580-7584 (5 paratypes), SU 62400 (5 paratypes), UMMZ 181771 (25 

 paratypes), USNM 198208 (25 paratypes), Pearl R., 2.6 mi. E. Sandy 

 Hook, Marion Co., Mississippi, November 14, 1955, Royal D. Suttkus 

 and Kristin T. Nielsen. 



Other paratypes. — All Pearl River system ; see original description 

 for data. 



UNITED STATES: Louisiana: TU 7369, 10462, 11588, 15073, 15465, 17472, 

 19825, 19880, 23310, 23351, 28429, 29942, 29962, 29975, 29989, 30010, 30025, 

 30040. Mississippi: USNM 197708; TU 3557, 3627, 3951, 4872, 8886, 9709, 

 13954, 14930, 14938, 15171, 16148, 17721, 17951, 18739, 18963, 19781, 22824, 

 23127, 23518, 23701, 23869, 26657, 26695, 26759, 26878, 27137, 27172, 27299, 

 28034, 28272, 28303, 28316, 28345, 28373, 28391, 28403, 28534, 28719, 28768, 

 28820, 30149. 



Other material studied 



UNITED STATES: Alabama: Cahaba R.: USNM 200473. Tombigbee R.: 

 USNM 200379 (about 1 mi. below mouth Sipsey R., at Greene-Sumter Co. line). 

 Mississippi: Tombigbee R.: USNM 198188. 



Diagnosis. — Noturus (Rahida) munitus, a member of the juriosus 

 group, has the posterior margin of the adipose fin nearly free from the 

 caudal fin, a short anal fin with 12 to 14, exceptionally 15 rays, an 

 abbreviated caudal fin with 45 to 52 rays, and typically 9 pelvic rays, 

 8 soft pectoral rays, 1 1 preoperculomandibular pores, and 2 internasal 



