LAMPREYS AND FISHES OF INDIANA. 267 



Ammocrypta asprella Jordan. 



Jordan and Gilbert, 1882, 8, 490. 



Form elongate and slender. Depth in length, about eight times. 

 Head in length, about four and one-third. Snout long, three in head, 

 the upper profile descending to tip of snout, with a regular curve. 

 Mouth horizontal, moderate, the maxillary not extending back to front 

 of eye ; premaxillary hardly protractile ; the lower jaw included. Eye 

 a little less than the snout. Gill membranes free from the isthmus. 

 Scales small, completely covei-ing the body, except the middle of the 

 belly ; about ninety-five along* the lateral line. Cheeks and opercles 

 with scales. Dorsal rays XIV, 13 ; anal, I, 12. Translucent, with 

 about a dozen dusky spots along the lateral line, and five to fifteen cross- 

 bars on the back. A dark spot on each opercle. Fins plain. Length 

 as much as five and one-half inches. 



Streams of region from Arkansas to Southern Indiana. Rising Sun 

 (J, 123) ; Knox and Posey counties (4, '88, 164). Has also been taken 

 in the Little Wabash River, Efiingham County, Ills. 



The size, scaliness and very slightly protractile premaxillaries of this 

 fish relate it to some of the species of Etheostoma. 



Forbes (14, No. 3, 23) found that the food consists principally of the 

 larvte of dipterous insects. 



Genus BOLEOSOMA DeKay. 



Form short to moderately elongated ; usually little compressed. Body 

 completely scaled. Mouth small or large, more or less inferior. Teeth 

 on the vomer. Premaxillaries protractile. Maxillaries not bound 

 closely to the preorbitals by the skin. Anal spines one or two. 



The genus, as here defined, includes the genera Boleosoina, Vaillantia, 

 Ulocentra, Cotiogaster and Lnodoma of Jordan and Gill)ert's " Fishes of 

 North America." 

 A. Anal spine single. 



1. Lateral line complete, or nearly so. nigrum, p. 268. 



2. Lateral line wanting on hinder half of the body. 



chlorosoma, p. 268. 

 AA. Anal spines two. 



1. Gill-membranes broadly united across isthmus (Ulocentra). ^ 



Jiistrio, p. 269. 



2. Gill-membranes scarcely united. 



a. Belly with a series of enlarged scales along the middle; 

 or, if these have fallen, with a naked strip (Cottogaster) . 



copelandi, p. 269. 



