85. PERCID.E PCECILICHTHYS. 
515 
a. Dorsal spines 8 or more ; anal spines well developed. 
b. Humeral region with an enlarged black scale-like process. 
c. Cheeks and opercles naked; nape naked; body striped virgatus. 
cc. Cheeks and nape naked ; opercles scaly saxatiUs. 
ccc. Cheeks, opercles, and nape more or less scaly jmnciulatus, arieisice. 
bb. Humeral scale obsolete or wanting. 
cl. Opercles and cheeks naked; preopercle creunlate; anal spines very long. 
Ie_piclus. 
del. Opercles scaly ; preopercle strictly entire, 
e. Lateral line nearly straight. 
/. Cheeks naked; or with only 3 or 4 small imbedded .scales close behind 
eye count lens, spectabi I is. 
ff. Cheeks evidently scaly, at least above asprigenis, jessicB. 
ee. Lateral line forming a slight curve above the pectorals; dorsals sub-eqnal. 
Dorsal spines 9 or 10. {Boleichlhgs Girard.) 
g. Cheeks scaly bullerianus, barratti, fnsiformis, erochrotis, cos. 
gg. Cheeks naked exilis, tvarreni, gracilis. 
aa. Dorsal spines 0 ; anal spines obsolete? {Alvarius) lateralis. 
a. Dorsal spines 8 or more; anal spines well developed. 
b. Humeral region with an enlarged scale-like process, which is always black, 
c. Opercles, cheeks, and nape naked ; body strijjed. 
806. P. virgatiBS Jordan. 
Body slender, snbfusiform, compressed, the back somewhat elevated, 
the caudal peduncle rather deep. Head long, rather slender and pointed, 
little compressed, the snout but little deenrved. Mouth rather large, 
somewhat oblique, the maxillary reaching to the pupil, the lower jaw 
scarcely shorter than the npjter ; teeth small, even, in several rows. 
Eye rather large. Posterior border of preopercle above, obtusely cre- 
nate. Scales rather large; lateral line distinct, on about 20 scales; 53 in 
a lengthwise series. Head naked; nape and breast naked. Color green- 
ish, each scale with a small blackish spot, forming conspicuous lateral 
stripes, as in Etlieostoma lineolatwm ; back and sides with cross-blotches ; 
humeral scale large and black; dorsal and caudal fin faintly barred. 
Head 3§ ; depth 5. D. IX-10 ; A. II, 8. Kock Castle River, Kentucky ; 
resembk^s the species of Etlieostoma. 
(Jordan, Proc. U. S. Nat. Mus. ii, 236, 1879.) 
cc. Cheeks and nape naked ; opercles scaly. 
807. P. saxatMas Hay. 
Body rather slender. Head pointed, the profile descending in a 
gradual curve. Month large, the maxillary extending to opposite front 
of pupil. Eye equal to snout, 4 in head. Cheeks, breast, and throat 
naked; opercles with a few large scales. Lateral line little arched, its 
tubes bn about 35 scales. Dorsals well separated, the second shorter 
and higher than first. Greenish, with darker tessellations; a black 
