New Species of Sierola, With Explanatory Notes. 87 
fairly closely, shallowly and a little coarsely punctate and hairy. Head 
longer than wide by the length in front of the eyes, width between the eyes 
considerably more than the length from eye to vertex; flatly convex above, 
depressed in front, tumid beneath; vertical margin straight, temples rounded, 
eyes flatly convex; antenne reaching the mesoscutum, all the segments 
longer than wide, pedicel nearly twice as long as wide, antennal fossz deep ; 
clypeus reduced by erosion to a carinate ridge, declivous at the sides, api- 
cally depressed and slightly projected in front of the anterior margin of the 
head; mandibles stout, curved, concavo-convex, truncate apically and toothed, 
base reaching the eye above; gula and sides of the head flatly convex, the 
former medially foreshortened, a little longer than wide, slightly protuber- 
ant behind where it is divided into two lobes by a wide, shallow sulcus, an- 
terior margin almost straight, posterior margin incised; propodeum finely 
rugulose; abdomen elongate ovate; wings with a yellowish brown pigmen- 
tation; length 3.5 mms. 
Described from one female (type) collected on Kaala mountain, Oahu, 
2500-3000 ft. elevation, by P. H. Timberlake, July 22, 10917. 
Type: Cat. No. 30, Bishop Museum. 
31. Sierola usitata n.sp. 
@ moderately flat, slender and elongate; head and thorax dull black, 
abdomen brilliant, antenne and legs brown to fuscous, the former fuscous 
outwardly, the latter basally. 
Head and thorax to the propodeum with a microscopically close, rather 
coarse, reticulate surface sculpture, a little coarsely, shallowly and closely 
punctate, clothed with silvery white hairs. Head considerably longer than 
wide, width between the eyes not much greater than the distance from the 
eye to the vertex; convex above, depressed in front and a little tumid be- 
neath, the greatest depth beneath the posterior end of the eye; vertical mar- 
gin straight, temples rounded, eyes flatly convex; antenne reaching the 
mesoscutum, all the segments longer than wide, pedicel twice as long as 
wide, antennal fosse deep; clypeus carinate, slightly projected in front of 
the anterior margin of the head, depressed in front and sloping at the sides, 
the carina extending backward on the top of the head beyond the base of the 
antenne ; mandibles fairly stout, curved, concavo-convex, truncate and toothed 
apically, base touching the eye above; gula and sides of the head flat, the 
former medially foreshortened, longer than wide, narrowing posteriorly, ante- 
rior margin straight, posterior margin incised; the latter with a highly pol- 
ished surface; propodeum finely rugulose; abdomen elliptical, apically acumi- 
nate, smooth and polished; wings with a deep yellowish brown pigmentation ; 
length 3.1 mms. 
@ smaller, head shorter, antennz more slender, mandibles luteo-testa- 
ceous; abdomen bluntly pointed at the apex. 
Described from five females and one male (type, allotype and para- 
types) collected at Kaumuohona, Oahu, by P. H. Timberlake, September 9, 
1QI7. 
Type: Cat. No. 31, Bishop Museum. 
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