154 New Species of Sierola, With Explanatory Notes. 
ing backward shortly on the top of the head: mandibles stout, curved, trun- 
cate apically and toothed, base touching the eye above, lower lobe protuber 
ant; gula and sides of the head flatly convex, the former medially fore- 
shortened, as wide as long, anterior margin arcuately concave, posterior 
margin incised; propodeum rugulose; abdomen somewhat piceous, ovate, 
smooth and polished; wings subinfuscate, with a very faint fuscous pigmen- 
tation; length 2.25 mms. 
Described from one female (type) collected on Kaumuohona, Oahu, by 
O. H. Swezey, December 5, 1907. 
Type: Cat. No. 162, Bishop Museum. 
163. Sierola atra n.sp. 
2 dull shining black, antenne, tibiz and tarsi brown black. 
Head and thorax with a microscopically fine reticulate surface sculp- 
ture; finely, shallowly and closely punctate but not uniformly so; hairy 
clothing short and inconspicuous. Head wider than the thorax, a little 
longer than wide, width between the eyes considerably more than the length 
from eye to vertex, length in front of the eyes not great; convex above, a 
little tumid beneath; vertical margin straight, temples rounded, eyes flatly 
convex; antenne hardly longer than the head, pedicel and first funicle seg- 
ment longer than wide, the following segments as wide as or wider than 
long, antennal fosse deep; clypeus carinate, apically depressed, hardly pro- 
jecting 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 and stout, bent at the middle, truncate apically and toothed, base touch- 
ing the eye above; gula and sides of the head flatly convex, the former 
medially foreshortened, a little wider than long, median groove effaced, ante- 
rior margin arcuately concave, posterior margin incised; propodeum very 
finely rugulose; abdomen short ovate, apically acuminate, smooth and _pol- 
ished; wings subinfuscate, with a very faint fuscous pigmentation; length 
2 mms. 
Described from one female (type) collected at 29 miles, Olaa, Hawaii, 
3800 ft. elevation, by W. M. Giffard, August 10, 1918. 
Type: Cat. No. 163, Bishop Museum. 
164. Sierola newelli n.sp. 
9? dull shining black, antennz and legs yellowish brown to fuscous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture; finely and fairly closely punctate; hairy clothing 
rather sparse, the hairs long and delicate. Head as wide as long, width 
between the eyes nearly twice the length from eye to vertex, length in front 
of the eyes not great; convex above, depressed in front, a little tumid 
beneath; vertical margin straight, temples rounded, eyes convex; antenne 
reaching the mesoscutum, all the segments longer than wide, antennal fossz 
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 fairly slender, curved, 
truncate apically and toothed, base not quite reaching the eye; gula and 
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