New Species of Sierola, With Explanatory Notes. 127 
apically acuminate, smooth and polished; wings hyaline; length 2.75 mms. 
Described from one female (type) collected on the Kaumuohona Trail, 
Oahu, by P. H. Timberlake, September 9, 1917. 
Type: Cat. No. 108, Bishop Museum. 
10g. Sierola fusca n.sp. 
2 shining black, legs and antennz fuscous, coxze and femora nearly 
black, trochanters, tibize and tarsi sordid yellowish brown. 
Head and thorax to the propodeum with a microscopically fine and 
shallow reticulate surface sculpture; coarsely and rather remotely punctate 
and hairy. Head nearly as wide as long, widest across the eyes, narrowing 
behind and in front, width between the eyes greater than the length from 
eye to vertex; flat above, convex beneath, the greatest depth beneath the 
posterior end of the eye; vertical margin slightly convex, temples rounded, 
eyes convex; antennze reaching the scutellum, all the segments twice as 
long as wide, antennal fosse deep; clypeus reduced by erosion from the 
sides to a thin, carinate ridge, apically depressed and projecting slightly in 
front of the anterior margin of the head, which is angulate, not transverse, 
the carina extending backward on the top of the head beyond the base of 
the antenne; mandibles slender, curved, truncate apically and toothed, base 
not reaching the eye above; gula flatly convex, a little foreshortened medial- 
ly, anterior and posterior margins arcuately concave; propodeum rugulose ; 
abdomen elongate ovate, smooth and polished; wings subinfuscate, with a 
faint fuscous pigmentation; length 2.75 mms. 
Described from one female (type) collected on Kaala Mountain, Oahu, 
1500-2500 ft. elevation, by P. H. Timberlake, July 9, 1016. 
Type: Cat. No. 109, Bishop Museum. 
110. Sierola croceipes n.sp. 
@ shining black; legs, mandibles except at the base, and antenne 
basally croceous, the antenne outwardly fuscous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture; finely, shallowly and somewhat remotely punctate; 
clothed with short, stiff silver gray hairs. Head as wide as long, widest 
across the eyes, narrowing behind and in front, width between the eyes 
greater by a half than the length from eye to vertex; flat above, tumid 
beneath, depth beneath the posterior end of the eye equalling the length 
from eye to vertex: vertical margin straight, temples rounded, eyes convex; 
antenne almost reaching the scutellum, all the segments considerably longer 
than wide, antennal fosse deep; clypeus short, carinate, apically depressed 
and projecting slightly 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 slender, curved, truncate apically 
and toothed, base touching the eye above; gula and sides of the head flat, 
the former not much foreshortened, nearly as long as wide, narrowing 
behind, anterior and posterior margins arcuately concave; propodeum rugu- 
lose; abdomen elongate ovate, apically acuminate, smooth and _ polished; 
Ines 
