New Species of Sierola, With Explanatory Notes. 153 
curved, concavo-convex, truncate apically and toothed, base not quite reach- 
ing the eye; 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; abdomen ovate, smooth and_ polished; 
wings subinfuscate, with a very faint yellowish brown pigmentation; length 
2.5 mms. 
Described from one female (type) collected on Tantalus Mountain, 
Oahu, 13009 ft. elevation, by W. M. Giffard. 
Type: Cat. No. 160, Bishop Museum. 
161. Sierola langfordi n.sp. 
2 dull shining black, legs and antennze yellowish brown to fuscous. 
Head and thorax with a microscopically fine and delicate reticulate 
surface sculpture; finely and somewhat remotely punctate, and hairy. Head 
considerably longer than wide, widest across the eyes, narrowing behind and 
in front, width between the eyes greater than the length from eye to vertex; 
flatly convex above, depressed in front, tumid beneath, the greatest depth 
beneath the posterior end of the eye; vertical margin straight, temples 
rounded, eyes convex: antenne reaching the mesoscutum, all the segments 
longer than wide, pedicel nearly twice as long as wide, antennal fosse deep; 
clypeus carinate, apically depressed, the point blunt, hardly projecting in 
front of the anterior margin of the head, which is angulate, not transverse, 
sloping at the sides; mandibles stout, bent at the middle, outer half flat- 
tened, truncate apically and toothed, base not quite reaching the eye; gula 
and sides of the head flat, the former medially foreshortened, wider than 
long, narrowing behind, with a depression along the median line, anterior and 
posterior margins arcuately concave; abdomen ovate, apically acuminate, 
smooth and polished; wings subinfuscate, with a very faint fuscous pig- 
mentation; length 3 mms. 
Described from one female (type) collected on Tantalus Mountain, 
Oahu, elevation 1300 ft., by W. M. Giffard, November 1-2, 1905. 
Type: Cat. No. 161, Bishop Museum. 
162. Sierola aspera n.sp. 
@ dull shining black, legs and antenne yellowish brown except the 
hind femora, the coxz and the apical segments of the flagellum, which are 
fuscous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture, coarser on the head and prothorax than on the 
mesothorax and scutellum; coarsely, shallowly and closely punctate; hairy 
clothing fairly long and thick. Head longer than wide by a half, width 
between the eyes hardly exceeding the length from eye to vertex; flatly 
convex above, depressed in front, a little tumid beneath; vertical margin 
straight, temples rounded, eyes flatly convex; antenne a little longer than 
the head, pedicel and first funicle segment twice as long as wide, the fol- 
lowing segments hardly longer than wide, antennal fossze deep; clypeus 
carinate, apically depressed, almost perpendicular, not projecting in front 
of the anterior margin of the head, declivous at the sides, the carina extend- 
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