150 New Species of Sierola, With Explanatory Notes. 
jecting 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 stout, curved, concavo-convex, truncate apically and 
toothed, base not reaching the eye; gula flatly convex, finely and closely 
punctate, medially foreshortened, as wide as long narrowing posteriorly, 
anterior margin arcuately concave, posterior margin incised; propodeum 
very finely rugulose; abdomen ovate, smooth and polished; wings subinfus- 
cate, with a faint yellowish brown pigmentation; length 3 mms. 
Described from two females (type and paratype) collected on Tantalus 
Mountain, Oahu, elevation 1300 ft., by W. M. Giffard, October 15, 1905, and 
numbered 10. 
Type: Cat. No. 154, Bishop Museum. 
155. Siecrola blackburni n.sp. 
@ shining black, the legs and antennze brown to fuscous. 
Head and thorax with a microscopically fine reticulate surface sculp- 
ture; coarsely and fairly closely punctate; clothed with short silver gray 
hairs. Head longer than wide by a half, width between the eyes a little 
more than the length from eye to vertex; flatly convex above, a little tumid 
beneath; vertical margin straight, temples rounded, eyes convex; antenne 
a little longer than the head, pedicel longer than wide, the following seg- 
ments as wide as long, antennal fosse deep; clypeus carinate, apically 
depressed, hardly projecting in front of the anterior margin of the head, 
declivous at the sides, the carina extending backward shortly on the top of 
the head; mandibles short, stout, curved, truncate apically and toothed, base 
not quite reaching the eye: gula and sides of the head flat, the former 
medially foreshortened, as wide as long, narrowing behind, anterior margin 
arcuately concave, posterior margin incised; abdomen short ovate, apically 
acuminate, smooth and polished; wings subinfuscate, with a very faint 
fuscous pigmentation; length 2.5 mms. 
Described from one female (type) collected on Kau, Hawai, a-a flows, 
3600 ft. elevation, by W. M. Giffard, July 18, r1or8. 
Type: Cat. No. 155, Bishop Museum. 
156. Sierola celerts n.sp. 
@ shining black, the legs and antenne basally yellowish brown, hind 
femora and antenne outwardly fuscous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture; coarsely, shallowly, fairly closely punctate, and hairy. 
Head wider than the thorax, longer than wide by a half, length from eye 
to vertex equalling the width between the eyes; convex above, a little tumid 
beneath, the greatest depth behind the eye; vertical margin straight, tem- 
ples rounded, eyes flat; antenne a little longer than the head, pedicel and 
first funicle segment twice as long as wide, second a little shorter, the fol- 
lowing segments as wide as long, antennal fossze deep; clypeus carinate, api- 
cally depressed but rather flat, not projecting in front of the anterior margin 
of the head, sloping at the sides; mandibles stout, curved, a little flattened 
outwardly, truncate apically and toothed, base touching the eye above; gula 
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