Studies in Fruit Flies. Part I. Dacini — Hardy AND Adachi 
163 
of the abdomen of cognatus are extensively 
blackened, the tibiae are all discolored with 
brown, and the specimens are consistently 
smaller than dorsalis. The ovipositor is dis- 
tinctly shorter and the apex is broader than 
in dorsalis (cf. Figs. 6^, 8r, and refer to meas- 
urements of the ovipositors of both species). 
The female specimens can readily be distin- 
guished by the comparatively broad apex of 
the ovipositor. 
FEMALE. The front is parallel sided and is 
unspotted. It is about twice as long as wide. 
There are two pairs of inferior frontal orbital 
bristles present; sometimes a weak third pair 
is present. The black spots on the face are 
large and oblong in shape. The first two an- 
tennal segments are rufous; the third segment 
is yellow brown. The third segment is less 
than three times as long as wide and about 
equal in length to the face. Thorax: Predom- 
inantly black with fine, short, yellow pile on 
the dorsum and gray pile and pubescence on 
the sides. The mesonotum has a pair of broad 
gray submedian vittae; otherwise it is chiefly 
shining black. The lateral yellow vittae are 
wedge-shaped and rather strongly tapered pos- 
teriorly. The scutellum is all yellow except 
for a narrow band of black across its base. 
Legs: The femora are almost entirely yellow 
to rufous; the front pair has a brown spot 
near the apex of the upper surface. The tibiae 
are discolored with brown; the tarsi are yellow 
except for the brownish, discolored apical 
subsegments. Wings: Very similar to those of 
dorsalis. We have been unable to find any 
distinctive differences in the venation or the 
wingmaculation. Abdomen: Broad black bands 
are present on the basal portions of terga one 
and two. A broad median vitta extends longi- 
tudinally from the base of tergum three to the 
apex of five; the sides of three to five are 
almost all black. The basal band on segment 
three is strongly narrowed, often interrupted, 
on each side of the median vitta. Ovipositor: 
The basal portion, in situ, is about 0.75 as long 
as the fifth abdominal segment. The ovipos- 
itor is very short; when fully extended (Fig. 
Fig. 6. Dacus {Strumeta) cognatus n. sp. a. Extended 
ovipositor; b, apex of piercer. 
6a), it measures approximately 3.4 mm. The 
piercer is evenly tapered to its apex, not 
slender pointed as in dorsalis. The preapical 
setae are very tiny and inconspicuous. The four 
pairs are approximately equal in size. The 
piercer measures about 1.2 mm. long by 0.13 
mm. wide at its widest point. The oviduct 
extends to within 0.28 mm. of the apex. The 
preapical setae are situated approximately 0.08 
mm. from the apex. The inversion membrane 
measures 1.21 mm. long by 0.28 mm. wide 
at its widest point. The rasper extends to 
within 0.36 mm. of the base of the segment. 
The basal portion of the ovipositor measures 
about 1.0 mm. by 0.96 mm. The spiracles are 
situated approximately 0.21 mm. from the 
anterior lateral margin of the segment. 
MALE. As in the female except for sexual 
characters. 
Length: Body, 6.0-6. 5 mm.; wings, 5.5- 
5.8 mm. 
Holotype female, allotype male, and 22 pa- 
ratypes, 10 female and 12 males from Los 
Banos, Philippine Islands, July 3-19, 1921, 
"Forest School,” some are labeled ex Eugenia 
sp..? (F. X. Williams); 2 males same locality 
as type, June, 1925 (C. E. Pemberton). 
