388 



SYNOPSIS OF THE CYPRINIDyE OF PENNSYLVANIA. 



Diameter of orbit greater than length of nraz/Jc, three times in length of head ; head five and one-half times in 

 total four and one-half to base tail. Scales 5 — 39 — 3. A dark vertebral line, and defined lateral silver band. 



ARGE.* 



Other species described as inhabiting the United States, arc ; 



A. rubcllus, Agass., Lake Superior; A. lineolatus, Ag., Osage River; A. zonatus, Ag., 



Putnam's Bulletin Mus., Corap. Zool., I, 9, Osage lliver; A. formosus, Putnam, 1. c, 



Mobile; A. dilectus and nmbratilis, Girard, Pr. A. N. S. Phila. 1856, 193, Arkansas 



It.; A. amabilis, Girard, It. Leon, Texas; A. megalops, Girard, San Felipe, Texas; A. 



"socius, Girard, Live Oak Cr., Texas. The only species known to occur in Pennsylvania is 



ALBUltNELLUS ltUBltlFltONS, Cope. 

 Proc. Acad. Nat. Sci., Phila., 1865, 85. 



The head is elongate conic and compressed, the outline of the vertex and front nearly 



s~ **. plane, scarcely descending at the end of the muzzle ; length one-fifth the total (thus differing 



[ ^*"~pr from dilectus, Gir., one-sixth). Operculum a little higher than long. Mouth elongate, 



^" very oblique, end of maxillary opposite anterior margin of orbit; border of premaxillary 



above opposite middle of pupil (differing in this from rubcllus, Ag.). Orbit nearer end of 



muzzle than to opercular border, its diameter not reaching former, and contained four times in length of head. 



Shape regularly fusiform, greatest depth five and one-half times in length including caudal. 



Scales 6 — 39 -f 2 — 3 fewer than in umbratilis, more than in oligaspis, and much as in amabilis, megalops, and 

 socius. These species are not so elongate, have differently proportioned heads and different coloration. The 

 lateral line has a long slight deflection as far as the dorsal fin. The pectorals do not reach the ventrals, which 



three-fourths longest dorsal and anal rays. Pectorals extend three-fifths way to ventrals, the latter do not reach 

 vent. Depth caudal peduncle one-third from middle base of caudal fin to opposite last anal ray. Hays 1). 1. 8. 

 A. I. 10 or 11. V. 8, P. 13. 



Upper surfaces half way to lateral line olivaceous, the scales darker bordered; from this point below, leaden 

 silvery; top of head, muzzle, caudal, dorsal, and pectoral fins dusky. 



Length 2.75 inches. 



Habitat. Southwestern Michigan; numerous specimens Museum Academy. 



* Alburncllus arge, m. sp. nov. 



Also an elongate species, less than the preceding, with deeper head and larger eye. 



Muzzle from orbit less than diameter of latter; end of os maxillarc opposite anterior rim of same; mandible 

 acuminate, not projecting when closed, no symphyseal knob. Frontal breadth two-thirds temporal, and three- 

 fourths orbit. Greatest depth a little over seven times in total length equal from end muzzle to preopercular 

 border. Proportions and formula of fins as in the last. Lateral line straight. A silver band along anteriorly 

 above the latter, dark-edged above and below. Muzzle and lips blackish. 



Length 2.75 inches. 



Habitat. Hither the Detroit River or the St. Josephs, the locality confused. Numerous specimens. 



