New Species of Sierola, With Explanatory Notes. 95 
wide, narrowing posteriorly, anterior margin nearly straight, posterior mar- 
gin incised; abdomen short ovate, smooth and polished; wings subinfus- 
cate; length 2.5 mms. 
Described from one female (type) collected at Palolo, Oahu, by O. H. 
Swezey, January 3, I9QI5. 
Type: Cat. No. 45, Bishop Museum. 
46. Sierola depressella n.sp. 
@ slender; shining black, antennz and legs fuscous. 
Head and thorax with a microscopically fine reticulate surface sculp- 
ture and extremely finely and remotely punctate, hairy clothing inconspicuous. 
Head twice as long as wide, width between the eyes a little less than the 
length from eye to vertex; nearly flat above and beneath; vertical margin 
straight, temples rounded, eyes flat; antennz a little longer than the head, 
pedicel longer than wide, following segments as wide as or wider than long, 
antennal fossze deep; clypeus carinate, apically depressed and slightly pro- 
jecting in front of the anterior margin of the head, sloping at the sides, the 
carina extending backward on the top of the head beyond the base of the 
antenne; mandibles slender, curved, truncate and toothed apically, base 
touching the eye above; gula flatly convex, not much foreshortened medial- 
ly, considerably longer than wide, anterior margin arcuately concave, poste- 
rior margin incised: abdomen elongate ovate, smooth and polished, a faint 
reticulate surface sculpture on the tergites; wings subinfuscate; length 
2 mms. 
Described from one female (type) collected on Kaala mountain, Oahu, 
2500-3000 ft. elevation, by P. H. Timberlake, July 22, 1917. 
Type: Cat. No. 46, Bishop Museum. 
47. Sierola glabra n.sp. 
@ slender, somewhat depressed; shining black, almost brilliant, tro- 
chanters, tibize, tarsi and antennz brown, the latter fuscous outwardly. 
Head and thorax with a microscopically fine reticulate surface sculp- 
ture, finely, shallowly and somewhat remotely punctate, hairy clothing incon- 
spicuous. Head somewhat longer than wide, width between the eyes equal- 
ling the distance from eye to vertex, length in front of the eyes not great; 
convex above and beneath, depressed in front; vertical margin straight, tem- 
ples rounded, eyes flatly convex; antenne hardly longer than the head, 
pedicel longer than wide, following segments as wide as or wider than 
long, antennal fosse deep; clypeus carinate, apically depressed and _ pro- 
jecting slightly in front of the anterior margin of the head, sloping at the 
sides; mandibles slender, curved, truncate and toothed apically, base touch- 
ing the eye above; gula and sides of the head flat, the former medially 
foreshortened, as wide as long, a little convex behind, anterior margin arcu- 
ately concave, posterior margin incised; abdomen elongate ovate, smooth and 
polished; wings subinfuscate; length 2.25 mms. 
Described from one female (type) collected on Tantalus mountain, 
Oahu, 1300 ft. elevation, by W. M. Giffard, May 7, Io11. 
Type: Cat. No. 47, Bishop Museum. 
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