SPAROID FISHES OF AMERICA AND EUROPE. 5O1 
84. ORTHOPRISTIS INORNATUS. 
Microlepidotus inornatus Gill, Proc. Ac, Nat. Sei. Phila. 1862, 256 (Cape San Lucas). 
Orthopristis inornatus, Evermann & Jenkins, Proc. U.S. N. M, 1891, 1448 (Guaymas). 
Habitat: Gulf of California. 
Etymology: Znornatus, not adorned. 
This interesting species is known only from the Gulf of California. 
The specimens examined by us are from Cape San Lucas and Guaymas. 
The subgenus Microlepidotus, which it represents, is a well-marked 
group, perhaps worthy of recognition as a distinct genus. 
XVII. ISACIA. 
Isacia Jordan & Fesler, gen. nov. (conceptionis). 5! 
Type: Pristipoma conceptione Cuv. & Val. 
Etymology: From Isaki, a Japanese name of Parapristipoma trilin- 
eatum (=Pristipoma japonicum Cuv. & Val.). 
We separate from the genus Purapristipoma an American species 
(conceptione), which ditters from the type of Pristipoma much as Ortho- 
pristis does from Pomadasis. The anal fin is very long in this species, 
and it lacks the peculiar sheath of scales found in Purapristipoma. 
The gill-rakers are well developed in both groups, but the outline of 
the dorsal is in Jsacia more as in Pomadasis. Although this species 
has been referred to Pristipoma, it lacks the symphyseal groove. 
ANALYSIS OF SPECIES OF ISACIA. 
a. Dorsal fin deeply notched; anal fin long; caudal fin forked. 
b. Dorsal spines 13 or 14, the soft dorsal about half as long as spinous portion; 
lower jaw projecting. Body oblong-elliptical, moderately compressed; an- 
terior profile nearly straight, a little depressed above eye; snout short and 
sharp; mouth small, oblique; teeth small, arranged in bands, the outer above 
a little enlarged; preorbital narrow; preopercle finely serrate; gill-rakers long 
and slender, x-++-22; scales above the lateral line arranged in very oblique series ; 
those below horizontal ; soft fins, naked; dorsal spines slender and ra!her high; 
soft dorsal rather low; anal spines small, graduated, second spine about half 
as long as first ray; pectoral about as long as head; caudal moderately forked. 
Color bluish-silvery below, a dark streak along each row of scales below the 
lateral line, these being horizontal and parallel; some scales above lateral line 
having pale centers, these making scattered paler spots; axil dusky. Head, 
34; depth, 23; D. x11-xrv, 12 to 14; A. 111, 13; scales, 10-65-16; eye, 43; snout, 
44; maxillary, 34; pectoral, 1;,; third dorsal spine, 2; second anal spine, 6; 
SOLA Orsalals cine SpIMOUS= =sotoe as oda S22 eee ee e211 CONCH TIONIS G5; 
85. ISACIA CONCEPTIONIS 
Pristipoma conceptione Cuv. & Val., v, 268, 1830 (Chile). 
Habitat: Coast of Chile and Peru. 
Etymology: From Concepcion in Chile. 
This species is an ally of Orthopristis brevipinnis. As, however, it 
lacks the central groove at the symphysis, it can not be referred to the 
same genus. The specimens seen by us are from Mexillones in Peru 
and from Caldera and Paraca in Chile. One specimen has 14 dorsal 
spines, the others 13. 
