74 New Species of Sierola, With Explanatory Notes. 
4. Sierola volcanica n.sp. 
@ shining black, antenne basally, trochanters, tibiae and tarsi brown to 
fuscous. 
Head and thorax to the propodeum with a microscopically fine surface 
sculpture, finely and only fairly closely punctate and hairy. Head wider than 
the thorax, considerably longer than wide, width between the eyes a little 
more than the length from eye to vertex; flatly convex above, a little tumid 
beneath, the greatest depth behind the eyes; vertical margin straight, temples 
rounded, eyes flatly convex; antenne reaching the mesoscutum, all the seg- 
ments of the flagellum longer than wide, the pedicel twice as long as wide, 
antennal fossze deep; clypeal process spatulate, horizontally extended, me- 
dially longitudinally elevate and carinate but apically not greatly exceeding 
anterior margin of the head; mandibles abnormally large, bent at the mid- 
dle, distal portion flattened, obliquely truncate and toothed apically, base not 
reaching the eye; cheeks moderately wide; gula and sides of the head flat, 
the former as wide as long, anterior margin arcuately concave, posterior 
margin incised; propodeum finely rugulose; abdomen elongate ovate, smooth 
and polished; wings subinfuscate; length 3 mms. 
Described from four females (type and paratypes) collected in Kau,-. 
Hawai, on the a-a flows, 3600-4000 ft. elev., by W. M. Giffard, July 13-27, 
TOI8. 
Type: Cat. No. 4, Bishop Museum. 
5. Sierola acuta n.sp. 
@ shining black but not brilliant, antenne basally, trochanters, tibfe 
and tarsi brown. 
Head and thorax to the propodeum with a microscopically fine, reticu- 
late surface sculpture, finely, shallowly, closely and distinctly punctate and 
hairy. Head wider than the thorax, longer than wide, width between the 
eyes a little more than the length from eye to vertex, convex above, rather 
flat beneath, depth moderate and greatest directly behind the eye; vertical 
margin straight, temples rounded; eyes flatly convex; antenne a little longer 
than the head, segments of the flagellum scarcely longer than wide, pedicel 
twice as long as wide, antennal fosse deep: clypeal process spatulate, angu- 
late in front, horizontally extended, exceeding the anterior margin of the 
head by half its length, medially longitudinally elevate and carinate; mandi- 
bles moderately large and stout, curved, concavo-convex, truncate apically 
and toothed, base not reaching the eye; cheeks rather narrow; gula and 
sides of the head flatly convex, the former wider than long, anterior margin 
arcuately, posterior margin semicircularly concave; propodeum rugulose, 
with a triangular area at its base smooth and shining; abdomen short oyate, 
smooth and polished; wings hyaline: length 2.25 mms. 
Described from three females (type and paratypes). Type, Honolulu, 
Oahu, collected by P. H. Timberlake on window of H. S. P. A. Exp. Sta. 
building July 18, 1916. Paratypes collected by O. H. Swezey behind leaf- 
sheath of cane on the grounds of the H. S. P. A. Exp. Sta. March 27, 1908. 
Type: Cat. No. 5, Bishop Museum. 
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