1064 Bulletin ^7, United States National Museum. 



Mississippi and northwest through Arkansas to Texas ; in sandy streams. 

 (vivax, vivacious.) 



Ammocrypla vivax, HAY, Bull. U. S. Fish Comm., n, 1882 (1883), 58, Pearl River, Jackson, 

 Mississippi. (Type, No. 32213. Coll. Hay.) 



1451. AMMOCETPTA BEANII, Jordan. 



Head 3f to 4; depth 1%. D. VIII to X-10 or 11; A. I, 9 or 10; scales 

 65. Body greatly elongated, subcylindrical, transparent. Head rather 

 large, heavier than in Ammocrypta pellucida. Mouth rather wide, nearly 

 terminal; the upper jaw somewhat the longer; outer teeth strong, 

 hooked. Opercular spine obsolete. Head entirely naked. Body naked, 

 excep't the caudal peduncle, which is sparsely covered with fhin, embed- 

 ded scales, and a series of rather large scales along the sides, on which 

 the lateral line runs. Dorsal fins high, wide apart, about equal in height 

 to the anal fin and to each other ; caudal fin emarginate. Color trans- 

 lucent, without bars or spots, the lateral line shining golden in life. 

 Spinous dorsal with a large black spot on the membrane anteriorly, 

 another near the middle, and some small ones behind; other fins with 

 their membranes dusted with dark points. Length 2J inches. Gulf 

 States, Alabama to Loui&jiana; rather common in sandy bottoms of clear 

 brooks in the pine woods. (Named for Dr. Tarleton Hoffman Bean, its 

 discoverer.) 



Ammocrypta beanii, JORDAN, Bull, x, U. S. Nat. Mus., 5, 1877, Notalbany River, Tickfaw, 

 Louisiana, (Coll. Bean); BOULENGER, Cat., i, 103; JORDAN & GILBERT, Synopsis, 489. 



Ammocrypta gelida, HAY, Proc. U. S. Nat. Mus., 1880, 490, Chickasawha River, Enterprise, 

 Mississippi. (Young.) (Type, No. 27425. Coll. Hay.) 



474. IOA, Jordan & Brayton. 



loa, JORDAN & BRAYTON, Bull. U. S. Nat. Mus., xn, 88, 1878, (vitrea). 



This genus differs from Ammocrypta chiefly in the presence of 2 well- 

 developed spines in the anal fin. The anal fin is proportionately smaller, 

 and the scales are larger and rougher, more fully covering the body. 

 Species small and slender, translucent in life ; abounding in sandy brooks 

 of the southern pine woods. (16$, an arrow or dart.) 



a. Cheeks and opercles closely scaled; anal rays II, 7. VITREA, 1452. 



oa. Cheeks and opercles naked; anal rays II, 10. VIGIL, 1453. 



1452. IOA VITBEA (Cope). 



Head 4 to 4; depth 7 to 7|. D. VII to IX-11 to 14; A. II, 6 to 9; 

 scales 50 to 62. Form of Ammocrypta pellucida, or a little less elongate. 

 Head slender, acuminate; mouth not very small, maxillary reaching 

 front of eye ; temporal region scaled ; eye 3 in head, nearly equal to 

 snout ; cheeks and opercles covered with large, imbricated, very roughly 

 ctenoid scales, these scales extending forward to the maxillary and back- 

 ward to edge of opercle and on subopercle ; the feeble- opercular spine is 

 almost hidden by them. Middle and lower part of the sides of the body 



