BULLETIN OF THE UNITED STATES FISH COMMISSION. 
49B 
, 413. Enneapterygius atriceps (Jenkins). Fig. 219. 
Head 3.25 in length; depth 4.5; eye 3.5 in head; snout 3.4; mouth 2.5; interorbital 2 in eye; 
D. hi, xiv 8 10; A. l, 20; scales 4-34-6. 
Body elongate, compressed, greatest, depth in middle of belly, depth of head 1.5 in its length; 
width of head 1.4; head pointed, triangular when viewed from above; snout blunt, pointed, oblique; 
jaws equal, low, and slightly produced; lips fleshy; mouth moderately large, slightly oblique; teeth 
in jaws fine, in bands; eye high, in first two-fifths of head, with a short filament above; anterior 
nostril with short fleshy flap; interorbital space narrow; three dorsal tins, first 2 divisions spinous, 
distinct from rayed portion; fifth dorsal spine 2 in head; second dorsal ray 2; anal fin rather low, lower 
than dorsal, anterior rays highest; caudal 1.4; pectoral pointed, middle rays longest, equal to head; 
ventral 1:75: caudal peduncle compressed, its least depth 3; lateral line inferior and straight at first 
until a little in front of the soft dorsal, where the tubes and pores stop; below this point a median 
series of deeply scalloped scales to base of caudal; scales ctenoid on side of body, belly naked. 
Color in alcohol, very pale brown or whitish, side with about 6 pairs of dark brown irregularly 
vertical bars more or less confluent; head marked with brown dots above, becoming larger and deeper 
on the lower surface, where the general color is grayish; fins pale or whitish, with a few dark dots on 
basal portion of dorsal and anal, otherwise pale; space about gill-opening blackish in front of pectoral 
Fig. 219. — Enncapteryg iuj atriceps (Jenkins). Type of Tripterygion atriceps Jenkins. 
ami with blackish spots below. Other examples, females, have the head pale, not blackish, with 
brown dots above and several larger on cheek opercle. 
Besides the type, we have examined 9 examples, ranging in length from 0.75 inch to 1.2 inches, 
obtained by Doctor Jenkins at Honolulu in 1889, and 37 examples 0.6 to 1.2 inches long, collected by 
us at Waikiki reef, near Honolulu, in 1901. 
This dainty little fish is very common in the holes in the coral rocks. It can be most successfully 
collected by lifting up large pieces of the rock and breaking them to pieces over a bucket or fine- 
meshed net. 
Triptenjriion atriceps Jenkins, Bull. ! T . S. Fish Comm., XXII. 1902 (Sept. 23, 1903),. 1 >05, tig. 46. Honolulu, Hawaiian Islands. 
(Type, No. 50719, U. S. Nat. Mus.; Coll. O. P. Jenkins.) 
Genus 246. BLENNITJS (Artedi) Linnaeus. 
Body oblong, compressed, naked; head short, the profile usually bluntly rounded; mouth small, 
horizontal, with a single series of long, slender, curved, close-set teeth in each jaw, besides which, in 
the lower jaw at least, is a rattier short and stout fang-like canine tooth on each side; premaxillaries 
not protractile; gill-openings wide, extending forward below, the membranes free from the isthmus 
or at. least forming a broad fold across it; dorsal fin entire, or more or less emarginate, the spines slen¬ 
der; pectoral moderate; centrals well developed, i, 3; no pyloric coeca; lateral line developed ante- 
