120 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



^ The type of Ptychostomus alhidus is a young individual of M. congestum. The scales 

 are of the usual size in this genus, about 45 in the lateral line instead of 56 as shown 

 in Girard's figure. Moxostoma congestum is very common in Texas, and seems to be 

 quite distinct from M. macrolejndotum. 



- Catostomus insignis is a valid species, nearer C. teres than C. clarki, but having a 

 broader upper lip thau the former. Its scales are considerably crowded anteriorly, 

 much more so thau in C. clarld, though less so thau in C. teres ; about 27 scales before 

 dorsal. Lat. 1. 56. D. 10. Lips broad, the upper vpith many series of tubercles; lower 

 without cartilaginous sheath; fontanelle small. "I^is is the Catostomus insigne of 

 Cope Si, Yarrow. 



^The type of Catostomus pleieius is a Pantosteus, allied to P. generosus, but with the 

 scales before the dorsal larger. Scales crowded forwards ; upper lip full, with 2 or 3 

 rows of tubercles; lowerwith5. Jaws with cartilaginous sheaths. Snout broad, mod- 

 erately projecting. Fins much Ic wer than in P. (7«2^ma»ien8is. D. 9. Lat. 1. 90 ; 29 to 

 30 in cross series. Head 4f in length ; depth 5. Ventral fins rather short. I do not 

 see that the descriptions of Pantosteus delphinus and P. hardus indicate any differences 

 from P. plebeius. 



* Catostomus clarki is very close to C. araojnts, differing chiefly in the larger size of 

 the scales before the dorsal (23 in clarki; 42 in arceopus). Scales little crowded an- 

 teriorly. D. 11. Lat. 1. 70. 



^The type of Catostomus guzmaniensis is a Pantosteus, and on comparison I am unable 

 to distinguish it from the type of Pantosteus virescens, Cope. The latter is said to be 

 from Pueblo, Colo. The specimens of the former are much smaller thau the type of 

 the latter, but they are apparently adult, the fius being tuberculate. D. 10. Lat. 1. 

 nearly 100; 46 scales before dorsal. Lips with cartilaginous sheath; upper lip with 

 many rows of tubercles. Eye small ; fins high, the longest ray of dorsal Ij in head. 

 Head 4^ in length. No fontanelle. 



8 The type of Catostomus generosus seems to me unquestionably identical with, the 

 type of Pantosteus platgrhyiwhus. Cope, as well as with P. jarrovii, Cope. The peculi- 

 arities of P. platgrlujnckus seem to be due to its shriveled condition. 



" Catostomus bernaraini is close to C. occidentalis, but the head in the former is less 

 condc and the lower fins longer. Scales much crowded, forwards, 75 in the lateral 

 jjine, 31 bclore dorsal. D. 12; longer than high. Lips broad, Avitliout cartilaginous 

 sheath ; the lower, as in C. occidenialis, deeply incised. Fontanelle large.. Caudal 

 lobes equal. 



8 Lat. 1. 73, in type of Campostoma ornatum. 

 "Lat. 1. 46, in type of C formosuhim. 



■^° Camjjostoma nasutum is an ordinary C. anomalum,. 



