152 New Species of Sierola, With Explanatory Notes. 
the sides, the carina extending backward shortly on the top of the head; 
mandibles stout, curved, concavo-convex, truncate apically and toothed, base 
touching the eye above; gula and sides of the head flatly convex, the former 
a little foreshortened, as wide as long, flat and depressed in front as well 
as in the groove behind, anterior margin arcuately concave, posterior margin 
incised; propodeum finely rugulose; abdomen ovate, smooth and polished; 
wings subinfuscate, with a faint fuscous pigmentation; length 2.5 mms. 
Described from three females (type and paratypes) from Manoa Cliff 
Trail-Tantalus, Oahu, reared from decaying wood of Perottetia sandwi- 
censis by J. C. Bridwell, July, 1918. 
Type: Cat. No. 158, Bishop Museum. 
159. Sierola humilis n.sp. 
@ shining black, antennze, trochanters, fore-tibia and tarsi, middle and 
hind tarsi yellowish brown. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture; coarsely and fairly closely punctate; hairy clothing 
short and inconspicuous. Head a little longer than wide, width between the 
eyes greater than the length from eye to vertex; convex above, depressed 
in front, a little tumid beneath; vertical margin straight, temples rounded, 
eyes flatly convex; antenne hardly longer than the head, pedicel and first 
funicle segment a little longer than wide, the following segments as wide as 
or wider than long, antennal fosse deep; clypeus carinate, apically depressed, 
hardly projecting in front of the anterior margin of the head, which is 
angulate, not transverse, sloping at the sides, the carina extending backward 
shortly on the top of the head; mandibles fairly stout, curved, concavo- 
convex, truncate apically and toothed, base touching the eye above; gula and 
sides of the head flatly convex, the former medially foreshortened, wider 
than long and finely punctate, anterior margin arcuately concave, posterior 
margin incised; propodeum finely rugulose; abdomen elongate ovate, smooth 
and polished; wings subinfuseate, with a faint yellowish brown pigmenta- 
tion; length 2.5 mms. 
Described from one female (type) collected on ridge south of lao Val- 
ley, W. Maui, 1800-2000 ft. elevation, by J. C. Bridwell, September 1, 1918. 
Type: Cat. No. 159, Bishop Museum. 
160. Sierola pro.xvima n.sp. 
@ shining black, the legs and antenne brown. 
Head and thorax with a microscopically fine and delicate reticulate 
surface sculpture; finely, shallowly and fairly closely punctate, hairy clothing 
short and inconspicuous. Head a little longer than wide, width between the 
eyes a little more than the length from eye to vertex; convex above and 
beneath; vertical margin straight, temples rounded, eyes flatly convex; anten- 
ne a little longer than the head, pedicel a little longer than wide, the follow- 
ing segments as wide as or wider than long, antennal fossz deep; clypeus 
carinate, apically depressed, hardly projecting in front of the anterior mar- 
gin of the head, which is angulate, not transverse, declivous at the sides, the 
carina extending backward shortly on the top of the head; mandibles stout, 
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