84 New Species of Sierola, With Explanatory Notes. 
gate ovate, smooth and polished; wings subinfuscate, with a very faint yel- 
lowish brown pigmentation; length 3 mms. 
Described from one female (type) collected at Puuwaawaa, N. Kona, 
Hawaii, 3800 ft. elevation, by W. M. Giffard in August, 1917. 
Type: Cat. No. 24, Bishop Museum. 
25. Sierola angustata n.sp. 
2 moderately flat, slender, and shining black, antenne basally, man- 
dibles except at the base, trochanters, tibiae and tarsi brown. 
Head and thorax with a microscopically fine reticulate surface sculp- 
ture, a little coarser on the head and propodeum, almost impunctate, the 
minute pin punctures extremely fine, shallow and remote, hairy clothing in- 
conspicuous. Head considerably longer than wide, the length from the eye 
to the vertex equalling the width between the eyes; flatly convex above, 
depressed in front, tumid beneath, the greatest depth behind the eye; ver- 
tical margin straight, temples rounded, eyes flatly convex; antenne a little 
longer than the head, segments of the flagellum a little longer than wide, 
pedicel and first funicle segment twice as long as wide, antennal fosse deep; 
clypeus short, flat on top, projected a little in front of the anterior margin 
of the head, apically depressed and bluntly pointed; mandibles slender, 
curved, toothed apically, base touching the eye above; gula and sides of the 
head flat, the former medially foreshortened, longer than wide, widening 
behind where it is divided into two lobes by a fairly deep median sulcus, 
anterior margin arcuately concave, posterior margin incised; abdomen elon- 
gate, smooth and polished; wings subinfuscate; length 2.25 mms. 
Described from one female (type) collected at Kilauea, Hawaii, by 
W. M. Giffard in January, 1915. 
Type: Cat. No. 25, Bishop Museum. 
26. Sierola levis n.sp. 
Plate XVI, Figure 5. 
@ moderately flat, slender, and shining, almost brilliant, black; legs, 
antenne basally and mandibles, except at the base, luteo-testaceous. 
Head and thorax to the propodeum with a microscopically fine reticu- 
late surface sculpture; impunctate or nearly so, the minute pin punctures 
and hairs of extreme fineness. Head nearly twice as long as wide, widest 
at the vertex, narrowing in front, length from the eye to the vertex more 
than the width between the eyes; convex above, depressed in front, tumid 
beneath, greatest depth behind the eyes more than half the length; vertical 
margin very slightly concave, temples rounded, eyes rather flat; antenne 
reaching the mesoscutum, all the segments of the flagellum considerably lon- 
ger than wide, pedicel and first funicle segment twice as long as wide, an- 
tennal fossze deep; clypeus short, projected a little in front of the anterior 
margin of the head, medially longitudinally elevate but without carina, api- 
cally depressed and bluntly pointed; mandibles long, slender, nearly straight, 
toothed apically, base touching the eye above, projecting slightly below; gula 
and sides of the head flat, the former medially foreshortened, twice as long 
as wide, somewhat protuberant behind and divided into two lobes by a deep 
median sulcus, anterior and posterior margins incised; propodeum rugulose, 
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