798 Bulletin 4/, Untied States National Museum. 



Body very slender. Mandible sliglitly projecting. First dorsal well in 

 advance of second, inserted just before the vent, about midway between 

 base of candal and tip of snout. Scales entire ; fins not scaly. (Greatest 

 depth of body 1^ in distance from nape to spinous dorsal. Very pale 

 olive, with a sharply defined silvery band found anteriorly on the lower 

 half of the fourth row of scales and the upper half of the fift*h row ; 

 toward the middle, opposite the dorsal fins, it is on the central portion 

 of the fourth row and on the margins of the scales of the third and fifth 

 rows, rising toward the tail, where it covers the lower half of third and 

 upper half of fourth rows; back and sides with scarcely any dark dots. 

 Potomac River, near Washington. {beryUinus, emerald color.) * 



Chirostoma heryllinum. Cope, Trans. Anier. Phil. Soc, 1860, 403, Potomac River, at Wash- 

 ington. 

 3Ieuidia herijlUna, Jordan & Gilbert, Synopsis, 408, 1883. 



1163. MEMDIA AUDENS, Hay. 



Head 4* ; depth 6. D. IV or V-I, 8 or 9 ; A.I, 17 or 18 ; scales 4.5-10. 

 Head rather broad and fiat above. Mouth small Eye 3 in head, equal 

 to snout and to interorbital space. Vent a longitudinal slit, its length 

 f diameter of eye. First dorsal spine inserted immediately above anterior 

 part of anal slit, slightly nearer base of caudal than snout. Pectorals 

 extending to beyond bases of ventrals, their length * head. Ventrals 

 reaching vent. Interspace between dorsals twice diameter of eye. Top 

 of head covered with large scales. Lateral silvery band on fifth row of 

 scales and edges of fourth and sixth rows ; the extreme parts of fifth 

 row not included in it. Scales with entire edges, which are nearly 

 straight, so that each scale is angulated behind. Soft dorsal naked. 

 Color and form of Menidia notata ; edges of scales somewhat dotted ;• a 

 dusky streak at base of anal. Length 3 inches. Mississippi River; 

 known only from Memphis and Vicksburg. {aadens, daring, having gone 

 far from the sea.) 



Menidia midens. Hay, Bull. U. P. Fish Comm., ii, 1882, r.4, Memphis, Tennessee, and Vicks- 

 burg, Mississippi; (Coll. Hay); .Iordan & Gilbert, Synopsis, 908, 1883. 



1164. MENIDIA GILBERTI. Jordan & BoUmau. 



Head 4| to 4,i ; depth 5J-5t. D. VI-I, 9 ; A. I, 21 or 22. Scales 4-48 or 

 49-4. Body rather slender, elongate, compressed, especially below. 

 Head short, its upper surface slightly convex. Snout larger than eye, 3 

 to 3i in head. Maxillary li in snout ; lower jaw included. Eye mod- 

 erate, 3 to 3i in head, l|s to li in interorbital space. Teeth in jaws small, 

 not close-set, none on vomer or palatines. Gill rakers long and slender, 

 about 20 developed below angle. Origin of first dorsal midway between 

 posterior margin of head and base of caudal, its posterior margin oppo- 

 site front of anal. Its longest spine 4.! in head. Insertion of second 

 dorsal midway between base of caudal and fifth scale in front of first 

 dorsal, opposite middle of anal, its longest ray equal to snout. Distance 

 between origin of second dorsal and base of caudal equal to a distance 



