BLUE CAT. 787 
Silurus cerulescens, RAFINESQUE (1820), Quart. Journ. Sci. Lit. and Arts, London, 49 (et 
var, melanurus). 
Pimelodus cerulescens, RAFINESQUE (1820), Ich. Ohiensis, 63.—KIRTLAND (1838), Rept. 
Zool. Ohio, 169, 194; (1846) Bost. Journ. Nat. H'st., iv, 332.—SrTrorER (1846), Sy- 
nopsis Fishes N. A. in Mem. Nat. Acad. Sci., 405. (All these descriptions refer more 
or less to Amiurus nigricans. ) 
Ictalurus cerulescens, GILL (1862), Proc. Bost. Soc. Nat. Hist., 43—Cors (1865), Proc. Acad. 
Nat. Sci. Phila., 85; (1570) Proc. Am. Philos. Soc., 489.—JORDAN (1874), Ind. Geol. 
Survey, 222.—GILL (1876), Ich., Capt. Simpson’s Exped., 417. 
Ichthalurus cerulescens, COPE (1869), Journ. Acad. Nat. Sci., 237. 
Silurus argentinus, RAFINESQUE (1820), Quart. Journ. Sci. Lit. and Arts, London, 50. 
Pimelodus argyrus, RAFINESQUE (1820), Ichthyologia Ohiensis, 64. 
Pimelodus furcifer, Cuv. and VAL. (1840), xv, 1389.—‘‘ Hyrtu (1859), Denkschr. Akad. Wiss. 
Wien, 16”.—‘“‘ KNER, Sitzgsber. Akad. Wiss, Wien, xxvi, 421.” 
Ictalurus furcifer, GILL (1862), Proc. Bost. Soc. Nat. Hist., 43.—JORDAN (1876), Manual 
Vert., 300. 
Pimolodus gracilis, HouGH (1852), Fifth Ann. Rept. Reg. Univ., Condition State Cabinet 
Nat. Hist., Albany, 26. 
Synechoglanis gracilis, GILL (1859), Trans, Lyc. Nat. Hist., 3 (reprint). 
Ictalurus gracilis GILL (1362), Proc. Bost. Soc. Nat. Hist., 43.—Copr (1865), Proc. Acad. 
Nat. Sci., Phila, 856.—JORDAN (1876), Man. Vert., 300.—JORDAN and CoPELAND 
(1876), Check List, 159. 
Pimelopus vulpes, GIRARD (1858), Proc. Acad. Nat. Sci., Phila., 170; (1859) U. S. and Mex. 
Bound. Surv., 33. 
Ictalurus vulpes, GILL (1862), Proc. Bost. Soc. Nat. Hist., 43.—JoRDAN and COPELAND 
(1876), Check List, 159. 
Pimelodus olivaceus, GIRARD (1858), Pac. RB. R. Survey, x, 211. 
Ictalurus olivaceus, GILL (1862), 1. c., 43; (1876) Rept. Ichthy. Capt. Simpson’s Exp., 417. 
—JORDAN (1876), Man. Vert., 300.—JORDAN and COPELAND (1876), Check List, 159. 
Synechoglanis beadlei, GiLL (1859), Trans. Lyc. Nat. Hist. N. Y., 2 (reprint), 
Ictalurus beadtei, GILL (1862), Proe. Bost. Soc. Nat. Hist., 43—JorRDAN and CoPELAND 
(1876), Check List, 159. 
Pimelodus houghit, GIRARD (1859), Proc. Acad. Nat. Sci. Phila., 159. 
Pimelodus megalops, GIRARD (1859), 1. c., 161 (said to have the eye very large, its dia- 
meter one-third the length of the side of the head). 
Ictalurus megalops, JORDAN and COPELAND (1876), Bull. Buff. Soc. Nat. Hist., 159. 
Pimelodus graciosus, GIRARD (1859), Proc. Acad. Nat. Sci. Phila., 161. 
Pimelodus hammondii, ABBOTT (1860), Proc. Acad. Nat. Sei. Phila., 568. 
Pimelodus notatus, ABBOTT (1869), Proc. Acad. Nat. Sci. Phila., 569. 
Ictalurus simpsoni, GILL (1862), Proc. Bost. Soc. Nat. Hist., 43; (1876) Ich. Capt. Simp- 
son’s Exp., 47. 
Description, —Body slender, little elevated, the dorsal region not much elevated, and 
the profile from snout to dorsal little concave; head rather small, conical, with small 
mouth; eye larger, placed medially, the middle of the head falling in front of its pos- 
terior margin; skin thin; pectoral spines long, 13 in head; coloration olivaceous, sil- 
very, the adult bluish, the young yellowish, with darker blotches, made of dark 
points, which disappear with age; head 4; depth 5 in length ; anal base about 4 times 
in length, of 25 to 29 rays. Length 1 to 24 feet. . 
