New Species of Sierola, With Explanatory Notes. 81 
closely punctate and hairy. Head wider than the thorax, as wide as long, 
width between the eyes considerably more than the length from the eye to 
the vertex; convex above, depressed in front, tumid beneath, the greatest 
depth beneath the posterior end of the eyes; vertical margin straight, temples 
rounded, eyes convex; antenne reaching the mesoscutum, all the segments 
of the flagellum longer than wide, the pedicel and funicle twice as long as 
wide, antennal fosse deep; clypeus spatulate, rather short, hardly exceeding 
the anterior margin of the head, convex above, apically depressed, contracted 
at the base by the inward extension of the antennal fosse; mandibles fairly 
stout, bent at the middle, distal portion flattened, truncate apically and toothed, 
the base not reaching the eye; cheeks fairly wide; gula and sides of the head 
flat, the former medially foreshortened, wider than long, anterior margin 
arcuately concave, posterior margin incised; propodeum short, finely acicu- 
late; abdomen elongate ovate, smooth and polished; wings subinfuscate, 
with a shallow yellowish brown pigmentation; length 3 mms. 
Described from two females (type and paratype). Type collected at 
Kilauea, Hawaii, 4000 ft. elev., by Giffard and Muir, January 19, 1917. Para- 
type collected in the same locality by W. M. Giffard, June 8, 1908. 
Type: Cat. No. 19, Bishop Museum. 
20. Sierola rocki n.sp. 
2 shining black, the legs, mandibles and basal segments of antenne 
yellowish brown, antenne outwardly fuscous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture, finely, shallowly and remotely punctate, hairy clothing 
inconspicuous. Head a little wider than long, widest across the eyes, nar- 
rowing slightly behind and in front, width between the eyes twice the 
length from eye to vertex; convex above, depressed in front, tumid_ be- 
neath; vertical margin straight, temples rounded, eyes convex; antennze 
reaching the mesoscutum, all the segments of the flagellum longer than 
wide, pedicel and funicle twice as long as wide, antennal fosse deep: 
clypeus spatulate, rather small, horizontally extended, and exceeding the 
anterior margin of the head by half its length, convex above, contracted 
at base by the inward extension of the antennal fosse; mandibles fairly 
stout, curved, concavo-convex, truncate apically and toothed, base touching 
eye above; gula and sides of the head flat, the former medially fore- 
shortened, wider than long, anterior margin arcuately concave, posterior 
margin incised; propodeum rugulose; abdomen elongate ovate, smooth 
and polished; wings with a shallow yellowish brown pigmentation; length 
2.25 mms. 
Described from one female (type) collected near Kilauea, at 29 miles, 
from Hilo, on the Hilo-Kau road, Hawaii by D. T. Fullaway, May 12, 
1913. 
Type: Cat. No. 20, Bishop Museum. 
21. Sierola bicolor n.sp. 
@ slender, shining black, almost brilliant, antenne basally, prothorax 
and the legs luteous, mandibles testaceous. 
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