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PACIFIC SCIENCE, Vol. V, April, 1951 
The compound eyes are oval in shape. The 
head bristles are all black. Thorax: Chiefly 
yellow to rufous, gray pollinose on the dor- 
sum. A pair of broad subshining black post- 
sutural vittae extends longitudinally through 
the area bounded on the sides by the inner 
posterior supra-alar bristles and by the 
dorsocentrals. The black vittae are broadly 
interrupted at the suture, and near their 
inner anterior apices they connect with a less 
distinct brown to blackish vitta which ex- 
tends just inside the inner edges of the suture 
to the front margin of the mesonotum be- 
tween the scapular bristles. The mesonotum 
also has a rather large presutural black spot 
just behind each humerus. The humeri and 
the scutellum are yellow. There is also a 
quadrate-shaped yellow spot, bounded by 
the prescutellar and the dorsocentral bristles, 
on the hind portion of the mesonotum. A 
transverse line of brown extends across the 
hind margin of the mesonotum almost con- 
necting with the posterior apices of the 
lateral vittae. The dorsocentral bristles are 
situated distinctly behind the anterior supra- 
alars. The four scutellar bristles are stronger 
than any of the other thoracic bristles. The 
scutellum has a few very short black hairs 
around the margin and a clump of black 
hairs on each side just behind the basal pair 
of bristles. The metanotum, metapleura, 
lower portion of the sternopleura, and median 
portion of the hypopleura are brown to 
blackish in color. The halteres are yellow. 
Legs: Largely yellow, hind tibiae and bases of 
middle pair blackened. Wings: As described 
above and as shown in Figure 28^. The basal 
portion is chiefly hyaline, and a faint brown- 
ish infuscation extends across the base just 
in front; another brown spot covers the 
forking of the radial sector and the base of 
vein M3+4. The stigma is all brown. The 
front margin of the wing has two hyaline 
indentations, one in the anterior one-third 
of the fourth costal section (cell R2) ex- 
tending transversely to vein M3+4; the other 
mark is smaller and extends from the margin 
near the outer two-thirds of the fourth sec- 
tion into the top edge of cell R5. One hyaline 
indentation occurs on the hind margin and 
extends about two-thirds through cell 2d M2. 
Vein R4-f-5 is rather sparsely bristled to a point 
about opposite the halfway point between 
the r-m and m crossveins. Abdomen: The 
entire fifth tergum and the sides of the other 
terga are shining bluish-black. The median 
portion of terga 1 to 4 is rufous in ground 
color and densely grayish pollinose. The 
vestiture is all black; the apical margin of 
the fifth tergum has a ring of about 12 
rather strong bristles. Genitalia: Yellow to 
reddish. The ninth segment is plainly visible 
from a dorsal view and is globose in shape. 
The anal area (tenth segment or proctiger) 
and the surstyli (the extended lower margins 
of the ninth tergum) are very elongate and 
slender (Fig. 28c). The anal region is thickly 
yellow pilose. 
Length: Body, 6. 5-8.0 mm.; wings, 5.5- 
6.5 mm. 
FEMALE. Very similar to the male. In the 
two specimens at hand the brown band 
across the lower portion of the face is 
interrupted in the middle. The sides of the 
fifth and sixth terga are yellow, the median 
portion is polished black. The coloration of 
the body is otherwise as in the males.. 
Ovipositor: Short and rather broad, the ex- 
tended length slightly less than 3.0 mm. The 
piercer measures about 0.75 mm. long by 
0.24 mm. wide and is very characteristic in 
shape. It is very sharply constricted toward 
the apex, the constriction beginning about 
0.19 mm. from the tip (Fig. 28V). The 
preapical setae are tiny and inconspicuous, 
and they are situated about 0.04 mm. from 
the apex of the piercer. The oviduct ends 
about 0.13 mm. from the apex. The inversion 
membrane, which is torn on the specimen 
which has been dissected, is apparently about 
1.2 mm. long by 0.3 mm. wide. The scales 
are rather sharp pointed and extend to 
within 0.6 mm. of the base of the segment. 
Holotype male, allotype female, and two 
