532 PROCEEDINGS OF THE ACADEMY OF [DeC._. 



latter 1^ in eye. Infraorbital broadest of other narrow suborbitals. 

 Posterior preopercle margin nearly straight, but slightly inclined 

 forward. 



GUI-opening to hind pupil margin, isthmus width at this point 2^ 

 in eye. Rakers 2 + 4 short weak points, much shorter than filaments, 

 latter 2 in eye. Pseud obranchise large, less than filaments. Isthmus 

 rather broadly depressed. Teeth lost. 



Scales moderately large, series parallel with 1. 1., mostly uniform 

 except smaller ones on caudal base, with fine radiating striae. L. 1. 

 continuous, first decurved slightly, then about midway along caudal 

 peduncle side. Tubes simple, each about f exposed scale. 



Dorsal origin midway between caudal base and snout tip, fin gradu- 

 ated down from first branched ray (damaged) and longest? Caudal 

 (damaged) emarginate, lobes equal? Pectoral f to ventral, upper 

 rays longest. Ventral inserted little before dorsal origin, not quite to 

 vent. Vent close to anal. 



Color in alcohol faded mostly dull or pale brownish, not darker above. 

 Edges of back scales slightly darker than ground-color. Head above 

 brownish, below paler or translucent, sides washed silvery-white. 

 Entire side of body bright silvery-white with underlaid median lateral 

 streak from shoulder to caudal base medianly. From snout tip, back 

 over underlaid leaden streak, dull brown band, inconspicuous and 

 narrower than vertical eye. Iris pale silvery, leaden lateral streak 

 passing through. Fins pale or plain dull brownish. 



Length lyf inches (caudal damaged). 



No. 3,152, A. N. S. P., cotype (type) of H. procne Cope. Conestoga, 

 tributary of the Susquehanna (Stauffer). Also Nos. 3,153 to 3,162, 

 same data. 



Head 3^ to 4^; depth 3f to 5^; D. iii, 7, i, rarely iii, 6, i; A. iii, 

 6, I, rarely iii, 7, i or iii, 5, i; scales usually 33, frequently 32, often 

 34, occasionally 35, seldom 31, rarely 36 + usually 2, occasionally 

 3; usually 6 scales, occasionally 5, above 1. 1.; 4 scales below 1. 1.; 

 13 predorsal scales usually, often 12 or 14, seldom 15, rarely 16; 

 snout 3^ to 4 in head; eye 2f to 3^; maxillary 3 to 3|; interorbital 

 2^ to 3^; teeth 4-4, rarely 5-4. Body elongate, compressed, rather 

 slender, caudal peduncle long, constricted. Head moderate. Muzzle 

 short. Eye circular, little high. Mouth oblique. Jaws even. 

 Rakers 2 + 5 short weak points. Scales well exposed, L. 1. complete, 

 little decurved at first. Dorsal origin midway between snout tip and 

 caudal base. Anal inserted well behind dorsal base. Caudal long, 

 forked, lobes pointed. Pectoral f to ventral, latter inserted little 



