New Species of Sierola, With Explanatory Notes. 147 
mens collected in the S. E. Koolau Mountains, Oahu, by J. C. Bridwell, 1913, 
and one collected on Kaumuohona, by P. H. Timberlake, June 4, 10916, 
paratypes. 
Type: Cat. No. 148, Bishop Museum. 
149. Sierola holomelaena n.sp. 
Q depressed; shining black, the head a little dull, legs and antennze 
fuscous. 
Head and thorax to the propodeum with a microscopically fine and 
delicate reticulate surface sculpture; finely, shallowly and somewhat remotely 
punctate; hairy clothing short and delicate. Head longer than wide, width 
between the eyes greater than the length from eye to vertex, length in front 
of the eyes not great; flat above, flatly convex beneath; vertical margin 
straight, temples rounded, eyes flatly convex: antennze longer than the head, 
all the segments a little longer than wide, antennal fosse deep; clypeus cari- 
nate, apically depressed, not projecting in front of the anterior margin of the 
head, sloping at the sides, the carina extending backward on the top of the 
head beyond the base of the antenne; mandibles slender, curved, truncate 
apically and toothed, base touching the eye above; gula flat, not much fore- 
shortened medially, anterior and posterior margins arcuately concave; pro- 
podeum very finely rugulose; abdomen ovate, smooth and polished; wings 
subinfuscate, with a faint yellowish brown pigmentation; length 2.75 mms. 
Described from one female (type) collected at Kilauea, Hawaii, 4000 ft. 
elevation, by Giffard and Muir, January 14, 1917. 
Type: Cat. No. 149, Bishop Museum. 
150. Sierola hirticeps n.sp. 
Qa little slender; dull shining black, coxze and femora fuscous to 
black, trochanters, tibiz, tarsi and antenne basally yellowish brown, anten- 
ne apically fuscous. 
Head and thorax to the propodeum with a microscopically fine and 
close reticulate surface sculpture; coarsely, shallowly and closely punctate ; 
thickly clothed with long silver-gray hairs. Head nearly twice as long as 
wide, length from eye to vertex equalling the width between the eyes; flatly 
convex above, depressed in front, a little tumid beneath; vertical margin 
straight, temples rounded, eyes flatly convex: antenne a little longer than 
the head, pedicel nearly twice as long as wide, the following segments as 
wide as long or nearly so, antennal fossz deep; clypeus carinate, apically: 
depressed, hardly projecting in front of the anterior margin of the head, 
which is angulate, not transverse, declivous at the sides, the carina extending 
backward shortly on the top of the head; mandibles slender, curved, trun- 
cate apically and toothed, base touching the eye above; gula and sides of 
the head flat, the former foreshortened medially, longer than wide, narrow- 
ing posteriorly, where it is a little convex, anterior margin arcuately con- 
cave, posterior margin incised; propodeum very finely rugulose; abdomen 
elongate elliptical, smooth and polished; wings subinfuscate, with a very 
faint yellowish brown pigmentation; length 2.75 mms. 
Described from five females (type and paratypes). Type from Tan- 
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