32 



illary bone. Color olive, with orange spots ; body 

 rather elongate ; size small, not exceeding 3| inches. 



humilis. 

 AAA. Operculum not composed of well differentiated osseous 

 and membranous portions, the bone becoming gradu- 

 ally thinner posteriorly and terminating in a flexi- 

 ble osseo-membranous flap, which is usually consid- 

 erably produced in adults, sometimes exceedingly 

 so, and is entirely black or with only a very narrow 

 edging of pale. Supplemental maxillary bone very 

 rudimentary or entirely wanting. 

 /'. Dorsal spines low, the longest but slightly more than 

 snout; gill-rakers very short and weak; color olive, 

 with blue or orange spots and wavy vertical streaks 

 of emerald; no black blotch on dorsal or anal be- 

 hind megalotis. 



ff. Dorsal spines higher, the longest usually greater than 

 snout and eye; gill-rakers rather long and slender; 

 color olive, with purplish lustre, usually rather 

 dark; dorsal and anal with black blotch at base of 

 last rays pallidas. 



Lejpomis cyanellus Rafinesque. 



Apomotis cyanellus, Jordan & Evermann, Bull. U. S. Nat. Mus., No. 47, p. 996. 



Distributed throughout the state, being the most abundant 

 sunfish in the smaller prairie streams and pools of central Illi- 

 nois. 



Lepomis ischyrus (Jordan & Nelson). 



Apo?notis ischyrus, Jordan & Evermann, Bull. U. S. Nat. Mus., No. 47, p. 097. 



Type, in possession of the Illinois State Laboratory of Nat- 

 ural History, obtained from the Illinois River in 1877. Not 

 again taken until 1899, when two excellent adult specimens 

 were obtained from the Illinois River at Meredosia. 



Lepomis euryorus (McKay). 



Eupomotis euryorus, Jordan & Evermann, Bull. U.S. Nat. Mus., No. 47, p. 1008. 



Form strongly suggestive of Eupomotis gibbosus, but the 



