Australian Fruit Flies ■ — Hardy 
135 
Dacus (Heterodaculus) visendus n. sp. 
Fig. Sa-e 
This species is distinguished from other 
Dacinae by the characteristics discussed just 
above. The pattern of the wing maculation 
will readily separate it from all other known 
species. 
MALE. Head: Entirely yellow, tinged with 
reddish, except for the moderately large ob- 
long black facial spots and for a dark brown 
spot just below the lower margin of each eye. 
The facial spots are about two times longer 
than wide and extend to near the oral margin. 
The vertical bristles are very well developed 
and are black in color. The other head bristles 
are brown, except for the yellow gular bristle 
and the yellow postoccipital row. The front is 
parallel sided and two times longer than wide. 
(Fig. 8a). The slightly raised median portion 
of the front between the inferior fronto- 
orbital bristles is discolored with brown to 
black, and the area around the bases of the 
superior fronto-orbital bristles is often brown. 
The inferior fronto- orbitals vary in number 
from three to four pairs; the average speci- 
mens have three pairs. The face is slightly 
convex on the upper portion with an inden- 
tation or indistinct transverse groove across 
the middle. The lower portion of the face is 
straight. The third antennal segment is dark 
brown to blackish and is distinctly longer 
than the face. The third segment is not, how- 
ever, conspicuously elongated; it is just 
slightly more than four times longer than 
wide. Thorax: Predominantly yellow-red in 
ground color with some dark patterns on the 
mesonotum and the pleura. As is typical of 
the subgenus the scutellum has but one pair 
of bristles; the prescutellar and anterior supra- 
alar bristles are lacking. The scutellum is 
entirely pale yellow except for a narrow 
reddish-brown band at its base. The mesono- 
tum has three postsutural yellow (or cream) 
vittae. The two lateral vittae are comparatively 
short and end one-third to nearly one-half 
their length from the posterior supra-alar 
bristles. The median vitta is two or more times 
wider than the laterals, it extends from the 
suture almost to the scutellum, and is broad- 
est at its base and gradually narrowed an- 
teriorly. The humeri, notopleura, and portions 
of the mesopleura, sternopleura, and meta- 
pleura are pale yellow. The yellow markings 
of the mesopleura extend broadly along the 
dorsal margin of the sclerite and connect 
with the humeri (Fig. 8h). The dark pattern 
of the mesonotum is rather irregular and ap- 
pears to be somewhat variable. In general 
there is a dark line on each side, extending 
just inside the lateral yellow vittae from the 
outer scapular bristles to a line opposite the 
posterior supra-alar bristles. Just in front of 
the suture these marks expand laterally and 
extend toward the bases of the anterior noto- 
pleural bristles. The metanotum is dark brown 
to black on the sides and is tinged with 
rufous in the median portion. The halteres 
are yellow. Legs: Entirely yellow, except for 
the brown to blackish hind coxae and tibiae 
and the slightly discolored apical subseg- 
ments of the tarsi. Wmgs: Conspicuously 
marked by a variable pattern which extends 
transversely through the middle of the wing. 
The costal band is yellow-brown to yellow- 
gray. The band extends through all of cell R3, 
except for a portion of this cell lying directly 
below the apex of vein Ri+s- The band is 
faint, but distinct, in cell R3 and does not 
extend noticeably beyond the tip of vein 
R4-1-5. The first two sections of the costa are 
yellowish-fumose and are densely covered 
with microtrichia except for the anterior half 
of the first section. The cubital streak is very 
broad and conspicuous; it fills the basal por- 
tion of cell M4 but does not extend to the top 
margin of the m-cu crossvein. The brownish 
streak extends almost to the apex of vein 
Cui-f-lst A. The area along vein Cui+lst A, 
on the underside of the wing has the usual 
long matted microtrichia and the large gray 
spot which extends through the apex of the 
1st anal cell. This area is not as conspicuously 
darkened or hairy as in the Daculus which have 
been studied. An irregular, yellow-brown- 
