(38) 
The following description is made from the adult specimen, seven 
inches long. Head, with flap, in length ; depth 2 1-6. Eye:=:snout, in 
head. The eye is large but smaller than the opercular spot, and not quite 
equal to inter-orbital space. D. I, 12; A. Ill, 10 ; dorsal spines rather short 
and stout, as long as from snout to middle of orbit. Second anal spine 
stout, third as long as dorsal spines. Pectorals and ventrals long, about 
reaching anal, the ventrals being the longer. V entral spine longer than dorsal 
spines. Body elongated, much elevated in front, heavy. General form and 
proportions of I. obscurus, (Ag.) Jord. Mouth wide for Ichthelis ; maxilla- 
ries reaching to line from middle of orbit; fins high, spines rather low but 
very stout. Occipital region very prominent and narrow in adult. The 
caudal peduncle about as long as wide in front. Color in alcohol, dusky, 
mottled with orange and blue ; cheeks with wide blue bands obscurely de- 
fined ; dusky dorsal and anal spot. Belly and lower fins with orange and 
yellow shades, in life apparently coppery yellow; each scale on sides and 
back with a blackish, longitudinal oblong spot resembling the markings of 1. 
inscriptus. Lower jaw and lower parts of cheeks a dull leaden blue, prob- 
ably brilliant in life ; blue line in front of and yellowish band around eye ; 
opercular spot large, flap very broad and black, with a very broad pale 
edge entirely surrounding the black ; the posterior width of edge more 
than half that of pupil ; scales very large and crowded. Lat. 1. 46 ; longitu- 
dinal rows 5-14; the lateral line very high; opercular scales large, 
those on cheeks moderate and six-rowed. Top of head flat and short, form- 
ing an angle with abruptly descending profile ; rim of orbit slightly elevated. 
Coloration resembling that of I. obscurus and Pomotis auritus. Its nearest 
relative is the former, from which it differs in the presence of blue lines on 
the cheeks, wider snout and widely margined opercular flap. The smaller 
specimen bears considerable resemblance to P. auritus , being less gibbous 
and having the opercular flap smaller ; it may be distinguished at once, how- 
ever, by the large mouth and pointed pharyngeals. 
35. 1. macrochira , Pa/. Gilded Sun Fish. A few specimens have 
been examined from tributaries of the Illinois and the Wabash valley. 
36. I. anagallinus , ( Cope.') Bliss. Bed-spotted Sun Fish. One speci- 
men in the collection from the Fox river. 
I. inscriptus probably occurs in the southern part of the state, but I have 
seen no specimen. 
37. 1. megalotis , Raf. Long-eared Sun Fish. Bather common in the 
southern part of the state. 
38. I. sanguinolentis , (Ag.) Bliss. Blue and Orange Sun Fish. Very 
abundant through the state, especially in northern part. 
Genus Pomotis , Raf. 
39. P. auritus (L.) Gunth. Common Sun Fish. Very abundant in the 
northern part of the state. Prof. Jordan informs me that it does not occur 
in the Wabash valley. 
FAMILY APHREDODERIDAE. 
In the present article I have the pleasure of adding a second genus to 
