( 39) 



this unique family : and, in consequence of certain characters present in the 

 newly discovered form, the family characters of this group must now read 

 as follows : 



Fam. Char. Vent jugular or thoracic, either in front of or between the 

 ventrals. Dorsal fin single, with three or four spines. Ventrals thoracic, 

 without spines and with more than five soft rays. Some bones of head 

 spinous ; teeth on jaws and palate ; scales ctenoid ; branchiostegals six ; 

 coecal appendages about twelve : air bladder simple. 



The following table shows the characters of the two genera of this 

 family as they now stand : 



Aphredoderus. I Sternotreinia, Gen. Nov. 



Yent jugular, in advance of ventral I Vent thoracic, between bases of 



tins. Dorsal nearly equidistant between I ventral fins. Dorsal nearer snout than 



snout and caudal. Last anal spine ) base of caudal. Last anal spine long and 



short and rather slender. | sleiider. 



Below is a comparison of the specific characters of the two forms. I 

 may here express my thanks to Mr. F. W. Putnam for the specimen of .4. 

 sayanua from which the following description is made : 



S. isolepis, sp. nov. Habitat, small, 

 weedy tributary to the Calumet river 

 near Chicago, and small streams in South 

 IlUnois. 



Vent more than twice as far from 

 lower jaw as from ventrals ; also more 

 than three times the diameter of the 

 eye from the junction of the gill mem- 

 branes. 



Pectorals, 1 3-5 in head. Ventrals 

 IM- Longest dorsal ray, 1 f's . Longest 

 dorsal spine, 2}4. Longest anal ray, 

 1^4. Longest anal spine 2, and as long- 

 as from snout to posterior border of or- 

 bit. Caudal fin 1}^ in head. Each 

 scale with an edge of dark puncta- 

 tions, forming fine longitudinal streaks 

 or lines. Vent behind end ot opercle, 

 and between bases of ventrals. 



Diaineter of caudal peduncle 1^ in 

 head. 



Scales on body nearly equal, being, if 

 anything, a trifle larger on the caudal 

 peduncle. Scales on opercle slightly 

 larger than on cheeks, the latter being 

 scattered and imbedded. Angle of 

 cheeks rounded and more than a right 

 angle. 



The distance from snout to anterior 

 ray of dorsal less than twice the base of 

 dorsal. Eye 13^2 times in inter-orbital 

 space, and more than once in snout. 



Color of living specimen a clear green- 

 ish ohve, lighter below; becoming yel- 

 lowish or orange on abdomen. 



A. say anus, [Gilliams) DeK. Hab- 

 itat, brooks near the coast from New 

 York to Louisiana. 



Vent nearer"lower jaw than to ven- 

 trals, and less"than twice the diameter 

 of the eye from the junction of the gdl 

 membranes. Pectorals 1 3-5 in head. 

 Ventrals the same. Longest dor- 

 sal ray the same. Longest dorsal 

 spine 2^2 in head. Longest anal ray, 

 \%. Longest anal spine, 2^4;. Caudal 

 fin. 1 l-"). Diameter of caudal peduncle 

 twice in head. Ventrals well separated, 

 slightly decurrent. Vent opposite mid- 

 dle of opercle. 



Longest anal spine less than from 

 snout to middle of orbit. Scales consid- 

 erably larger anteriorly, larger on 

 opercle than on cheek. Lower posterior 

 angle of cheeks about a right angle. 

 Eye=snout, and also inter- orbital space. 

 Ventrals considerably in front of dorsals. 

 Distance from snout to anterior ray of 

 dorsal 23^2 times base of dorsal. Scales 

 on cheeks and opercles large and loose. 



