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4M <br />i- <br />194 Bailey and Cross <br />of the type specimen (Holly, 1936: 41) show a dried specimen with <br />shrunken snout. The head length seems to be between 29.8 any-] <br />30.0 per cent of the standard length —too small for album but well <br />within the range of variation in platarynchus. If the counts are cor- <br />rect, the dorsal -fin rays (39) point to identification with album, the <br />anal -fin rays (?3) to platorynchus. As indicated above, fin -ray counts <br />are difficult to obtain with accuracy. Until someone who has a first- <br />hand acquaintance with the species can examine the type specinj,n, <br />we see no reason why mexicanus should not be referred to the svn- <br />onymy of platoryn.chus. Judging from the known distribution of the <br />species, the type of mexicanus probably came from the Rio Grande. <br />Diagnosis. —A species of Scaphirhynchus with 30 to 36 dorsal <br />rays and 18 to 23 anal rays; gillrakers on lower half of first arch <br />mostly with 3 or 4 blunt tips; contrasting with S. album notably in <br />smaller head, narrower mouth, longer inner barbels, shorter and <br />usually blunter snout, more advanced position of barbels, with outer <br />pair originating on a level with or anterior to inner pair, larger eye, <br />and lard( r ].•>;nal plates, especially in Iateral series, presence of small <br />aermal ,Cutts on belly in adults, and more brownish color (see Tables <br />I and Il- and compare Tables II and III; see test comparison, pp. <br />177-190, and Fig. 9). <br />New locality records. —On Figure 10 are plotted all records of the <br />STW11 — !;nom v-n to us. Literature reports are cited in the synonymy; <br />those vermed by us are indicated there.. Below are listed museum <br />numbers and localities for specimens examined by us (indicated by <br />asterisks) or on which information has been made available to us by <br />colleagues (see Acknowledgments). <br />AL. &Bex-- <br />*C'1�IZ 13'704, Tennessee Ricer at Wilson Dam. <br />4 USN M 143799, wheeler Reservoir, _Morgan Co. <br />`- Spring Ricer at Imboden and at Black Rock, Lawrence Co.; Black Ricer, Pocahontas. <br />Randolph Co.; and Black River, Powhatan, Lawrence Co. (specimens eauc'i, <br />Y = Baron L. _Marshall, the records made available to us by Dr. John D. Blacs,. <br />bm <br />ILLMOIS <br />Illinois Natural History Surrey, Mississippi Ricer, Savanna, Carroll Co. <br />*U'LIMZ 101572, _Mississippi Ricer, Chester. <br />; *U.IMMZ 111542, 'Mississippi River at Cairo bridge, i4 mile above confluence with <br />Ohio River, Alexander Co. <br />