Jordan and Evermann. Fishes of North America. 1033 



rather elongate, fusiform, compressed behind. Head moderately elongate 

 less pointed than in some of the species. Mouth moderate, the lower jaw 

 included ; maxillary reaching just past the front of the eye. Gill mem- 

 branes scarcely connected ; distance from mouth to gill cleft about half 

 head. Lateral line straight, prolonged forward to the eye. Opercles 

 with rather large scales ; cheeks usually covered with very small ones, 

 which are scarcely visible, but rarely or never obsolete ; breast naked ; 

 nape naked, or more or less scaly ; middle line of belly with enlarged 

 caducous scales ; body otherwise entirely scaly , the scales small and rough. 

 Pectoral a little shorter than head; ventrals well separated. Skull 

 smoother than in Percina, its outline more convex, frontal region very 

 narrow ; supraoccipital crest minute. Pyloric creca 3. Vertebrae 

 19 -f- 23 = 42. Shoulder girdle and pharyngeals as in Percina. Coloration 

 straw yellow or greenish, with dark tessellations and marblings above, 

 and about 7 large dark blotches along the sides, which are partly conflu- 

 ent, thus forming a moniliformband ; fins barred. Great Lake region to 

 the middle Missouri, and north to Minnesota ;* southward through Mis- 

 souri, Indiana,, and Kentucky to Arkansas, especially common in the 

 Ohio Valley ; abundant in clear, gravelly streams, not common in small 

 brooks. One of the most curious and elegant of the darters. Its color- 

 ation varies much in intensity with differences in surroundings. (Aspro, 

 or Zingel, a related genus, which this species resembles ; from asper, rough.) 



blennioides, KIRTLAND, Journ. Boat. Soc. Nat. Hist., 1839, 340, fig. (but not descrip- 



tion) ; not of RAFINESQUE. 

 Alvordiiis aspro, COPE & JORDAN, Proc. Ac. Nat. Sci. Phila., 1877, 51, White River, Indian- 



apolis, Indiana, substitute for Etheostoma blennioides, of KIRTLAND and AGASSIZ; JORDAN & 



GILBERT, Synopsis, 501, 1883. 

 Percina aspro, BOULENGER, Cat., I, 59. 



1422, HADROPTERUS GtlNTHERI (Eigenmann & Eigenmann). 



Head 3 to 4 ; depth of to 6. D. X-13 or 14 ; A. II, 9 to 11 ; scales 5-56 

 or 57-9, pores 53 to 56. Premaxillaries not protractile; distance from 

 mouth to gill cleft half head; gill membranes scarcely connected; ven- 

 tral line with the median scales enlarged ; lateral line complete ; palate 

 with well-developed teeth ; preopercle entire ; nape and breast (with the 

 exception of the median line) naked; cheeks and opercles each with 

 about 3 series of large scales. A strong opercular spine ; pectoral nearly 

 as long as head. Yellowish; back marbled with darker; a lateral series 

 of large dark spots ; dark streaks below and before eye ; spinous dorsal 

 with a dark spot in front and another behind. Closely related to Radrop- 

 terus ouachitce. Souris River, Winnipeg, south to Iowa. (Eigenmann/) 



* Recorded by Dr. Eigenmann from Brandon and Winnipeg in Manitoba. Concerning these 

 specimens, Dr. Boulenger remarks: "The latter specimens have been referred by Prof. Eigen- 

 mann to P. aspro, from which they differ in the naked cheek (with or without a few embedded 

 scales) and the smaller number of scales in the lateral line. They show the following formula: 



D. XIII, 12-14; A. II, 9-10; scales 64-72^ ; lateral line 56-62. In the Bull. U. S. Fish Comm., 

 vin, 1889, p. 113, Professor Jordan says of P. peltata: 'General form of E. aspro, from which this 

 species scarcely differs except in the larger size of the scales.' If so, the Canadian specimens 

 belong to P. peltata and not to P. aspro. The two species are, however, nearly completely con- 

 nected, and may ultimately have to be united." 



