206 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
over insertion of anal, and anterior rays of both fins longest, those of anal gradually smaller behind, 
the last 2 minute and close together; caudal emarginate, lobes rounded; pectoral rather long, lower 
rays longest; ventrals small, united to form a small round disk whose diameter is 2.25 in head; 
caudal peduncle compressed, elongate, its length equal to head, its depth 2.25 in head. 
Color in alcohol, very pale translucent brown, 7 V-shaped pale brown markings on upper side of 
body united over back; fins whitish. 
We have examined 7 examples obtained at Hilo, each about 1.2 inches in length: 
Locality. 
Final disposition of specimen. 
Locality. 
Final disposition of specimen. 
Hilo 
Do.... 
Do.... 
Do.... 
Type, No. 50655, U. S. N. M. 
Cotype, No. 7469, L. S. Jr. Univ. Mus. 
Cotype, No. 2720, U. S. F. C. . 
Cotype, No. , M. C. Z. 
Hilo 
Do 
Do 
Cotype, No. 2295, Am. Mus. Nat. Hist. 
Cotype, No. 24223, Ac. Nat. Sci. Phila. 
Cotype, No. 1700, Bishop Museum. 
Family PTEROPSARIDAi. 
OSURUS Jordan & Evermann, new genus. 
Osurus Jordan & Evermann, new genus of Pteropsaridx ( Parapercis schauinslandi Steindachner). 
This genus is allied to Parapercis, from which it differs in having the caudal fin deeply forked 
instead of truncate. 
Family FIERASFERIM. 
54. Fierasfer umbratilis Jordan & Evermann, new species. 
Head 10.2 in length; depth 15.2; eye 5 in head; snout 4.8; mouth 2.6; interorbital 4.5. 
Body very elongate, compressed; tail very long and tapering gradually in a long point; head 
elongate, conic, its depth 2 in length, width 2.25; snout rather broad, conic, and produced beyond 
mandible; mandible broad, flattened below; mouth nearly horizontal, broad, the gape reaching below 
posterior margin of eye; eye rather small, anterior, without eyelid, and placed about first quarter of 
head; nostrils well separated, anterior with elevated rim, posterior a short, crescent-like slit; inter- 
orbital space rather broad, convex; gill-opening low, inferior, rather long; gill-membrane free from 
isthmus, its angle nearly an eye diameter distant from posterior margin of eye; dorsal fin almost 
rudimentary, very low and thin; anal rather broad, in middle its height is about 0.75 in eye, from 
which point it gradually decreases to tip of tail, where it is rudimentary, like dorsal; tail ending in 
a fleshy point, caudal fin apparently absent; pectoral small but relatively large, 3.1 in head, rays very 
minute; lateral line distinct, running down along middle of side on posterior half of tail; no scales. 
Color when fresh (field No. 03506), pale olivaceous, with pale greenish spots; a pale bluish streak 
in each spot over lateral line; pale purplish oblong spots on lower half of body; head greenish-olive, 
with pale green spots closely set on cheek and jaw; pale purplish dots on upper part of cheek and 
behind eye; first dorsal same as body, but the spots yellowish; a black spot behind first and second 
rays, tips pale; rays of second dorsal checked alternately with yellowish-green and white; caudal 
same as second dorsal, but margin yellowish; anal, yellowish-olive; tip blackish; pectoral and ventrals 
pale; iris greenish-vellow; dull red streaks radiating from pupil. 
Color in alcohol, brown; head and end of tail dark sooty or blackish brown, the color formed of 
dark points; greater part of anal fin, lower surface of body anteriorly and pectoral and branchiostegal 
membranes, pale straw color; lower surface of trunk more or less blotched with pale brown. 
Our collection contains but 2 specimens of this species, both obtained at Hilo. Type, No. 50656, 
U. S. N. M. (field No. 03506), a specimen 7.6 inches long; cotype, No. 7470, L. S. Jr. Univ. Mus. (field 
No. 528), an example, 6.4 inches long. 
Fierasfer umbratilis occurs also in the South Seas, and is readily distinguished from most related 
species by its dark, non-translucent coloration. 
F. boraborensis from Borabora, briefly described by Kemp, has the pectoral 6 to 7 times in head. 
