1S87.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 57 



10. Etheostoma (RhothcEca) rupestre Gilbert &, Swaiii, sp. nov. 36695. 

 Closely related to Etheostoma thalassinmn, from wbich it may be dis- 



tiuguislied by its more sleuder form, the absence of bright coloration, 

 the smaller scales, and the squamation of the opercle. 



Body slender, fusiform, little compressed, the upper anterior profile 

 descending rapidly to tip of snout. 3Iouth small, horizontal, terminal, 

 at lower side of snout, the lower jaw included ; maxillary reaching ver- 

 tical from front of orbit, its length slightly less than diameter of eye, 

 3^ in head in specimens li inches long. Interorbital space very nar- 

 row, its width half diameter of orbit. Gill-membranes widely joined, 

 free from the isthmus. 



Scales small, 6 to 7 longitudinal series between lateral line and the 

 base of the spinous dorsal ; tubes of lateral line usually 55 or 5Q in 

 number, varying from 50 to 57. Lateral line complete, straight. Oper- 

 cle more or less completed covered with scales as large as those on sides; 

 cheeks and breast naked, the nape closely scaled. 



Fins of moderate size, the spines weak and flexible. Length of dorsal 

 spines equaling distance from tip of snout to middle of orbit. Anal 

 spines short, about equal in size, their length less than diameter of orbit. 

 Pectorals long, reaching beyond vertical from vent, their length 3 to 3^ 

 times in length of head and body. Yentrals reaching vent. Caudal 

 short, not deeply notched, ii in length. 



Head, 34 to 4 in length ; depth, 5i|. D. XI or XII— 11 or 12 ; A. II, 

 7 (8). Lat. 1. 50 to 57 ; 6 or 7 series above lateral line. 



Coloration in life: Grass green, with darker markings, but no red or 

 blue. Back with six dark cross bars, wider than the light interspaces. 

 A series of six dark blotches, sometimes W-shaped, along sides imme- 

 diately below lateral line. Usually four dark spots at base of caudal, 

 two of which are closely approximated at base of median caudal rays. 

 Dark vermiculatious on top of snout; a dark bar downwards, and one 

 downwards and forwards from eye. Fins with wiivy dusky bars. 



Xumerous specimens were taken by us in North River, a tributary 

 of the Black Warrior, near Tuscaloosa, Ala. It may prove to be a sub- 

 species of thalassimim, but we cannot at present so determine it. 



11. Etheostoma (Etheostoma) saxatile Hay. 36628, 36630, .36736. 

 Numerous specimens from various localities enable us to contribute 



the following points to our knowledge of this species : 



With much the habit of E. olmstecU, but the snout slender and sharp, 

 with gently decurved profile and the mouth terminal, nearly horizontal. 

 Lower jaw included ; maxillary extending scarcely beyond vertical from 

 front of eye. Pieopercle entire; ojiercular spine developed. Gill mem- 

 branes evidently but rather narrowly united across isthmus. 



Pectorals reaching somewhat beyond ventrals, about as long as head, 

 not nearly reaching vent. Ventrals not extending two thirds distance 

 to front of anal, equaling distance from snout to preopercle. Dorsal 

 fins well separated, the interval between them equaling two-thirds diam. 



