1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM 47 



36. Notropis args (Cope). 



This species was originally described in 1S3C by Prof. E. D. Cope, 

 from specimens probably from southeastern Michigan, whether from 

 the Detroit River or from St. Joseph River of the Maumee he did not 

 know. 



Dr. Jordan has always regarded it as identical with Notropis atheri- 

 noides (Raf.), but upon examining specimens from Wild Cat and Deer 

 Creek he agrees with us in regarding it as a good species. 



As the only printed description of this species is that found in Cope's 

 "Cypiinidii' of Pennsylvania," I860, p. 387, it seems desirable to re- 

 print it in this connection: 



"Alburnellus arge Cope. Diameter of orbit greater than length of 

 muzzle, three times in length of head; head five and one-half times in 

 total, four and one-half to base of tail. Scales 5-39-3. A dark verte- 

 bral line and definite lateral silver baud." Aud in a foot note: 



"Alburnellus arge, m. sp. nov. Also au elongate species, less than 

 the precediug, with deeper head and larger eye. Muzzle from orbit less 

 thau diameter of latter ; end of os maxillare opposite anterior rim of 

 same; mandible acuminate, not projecting when closed, no symphysel 

 knob. Frontal breadth two thirds temporal and three-fourths orbital. 

 Greatest depth a little over seven times in total length, equal from 

 end muzzle to preopercular border. Proportion and formula of fins as 

 in the last [Alburnellus jacuhis= Notropis atherinoides]. Lateral line 

 straight. A silver baud along anteriorly above the latter, dark-edged 

 above and below. Muzzle and lips blackish. Length, 2.75. 



"Habitat: Either Detroit River or the St. Joseph's; the locality con- 

 fused. Numerous specimens." 



The species differs quite evidently from Notropis atherinoides, the spe- 

 cies which it most resembles. It is more slender, the snout is heavier 

 and not so pointed, the eye is larger, equaling the interorbital 

 space and exceeding the snout, 3t in head, while in N. atherinoides 

 the eye does not equal the interorbital space, just equals the snout, and 

 is contained 3i times in head. The origin of the dorsal in N. arge 

 is but little nearer end of snout than base of caudal ; in the other it is 

 midway between end of snout aud free end of caudal; the first 

 has a broad plumbeous lateral baud, bordered below with silvery, ex- 

 tending straight from the opercle to base of caudal, while in the second 

 this line is little more thau a silvery one. Notropis arge has a well- 

 marked black vertebral line, which is scarcely evident in atherinoides, 

 and the lateral line is lessdecurved than in atherinoides. 



D., 8; A., 10; eye, 3}; head, 4; depth, 5| j lateral line, 5-40-4; 

 teeth, L'-4-4-2. 



37. Notropis rubrifrons (Cope). 



Six specimens from Wild Cat, a dozeu from Deer Creek, seven from 

 the Wabash, and many from the Tippecanoe. Xot noticed elsewhere. 



