Australian Fruit Flies — HARDY 
167 
Apparently the female has not been de- 
scribed, and no specimens have been seen 
during this study. 
Length: Body, 7.0 mm.; wings, 6.0 mm. 
TYPE locality: Glasshouse Mountain, 
South Queensland. 
Type in the Queensland Museum. One 
male specimen is in the Krauss collection 
from Atherton Tableland, Queensland, ex 
Llanchonella sp.. Sept., 1949. 
Dacus (Strumeta ) tryoni (Froggatt) 
Fig. 24^, h 
Tephritis tryoni Froggatt 1897. Agr. Gaz. N. S. 
Wales 8: 410-412, fig. 18. 
Chaetodacus tryoni var. musa Tryon 1927. Roy. 
Soc. Queensland, Proc. 38(14): 187. 
Chaetodacus tryoni var. juglandis Tryon 1927. 
Roy. Soc. Queensland, Proc. 38(14): 188. 
Apparently this species is quite variable in 
color and it is questionable that the designa- 
tion of color varieties has any value in this 
case. In some series of D. tryoni I have found 
that a high percentage will often fit the variety 
sarcocephali and in some cases the individuals 
intergrade into a more melanistic form which 
appears to be typical melas (Perkins and May) . 
The variety which Tryon described as musa 
appears to be the same as typical tryoni^ and 
his juglandis is evidently an intergrad- 
ing form between typical tryoni and variety 
sarcocephali. 
Dacus tryoni has been treated frequently in 
the Australian literature and for the most part 
the taxonomic details have been adequately 
covered. The following discussion gives the 
most important characteristics of the species. 
The species is well defined by the yellow- 
brown-fumose costal cells which are densely 
covered with micro trichia. The female ovi- 
positor is also distinctive and is very useful 
in separating this species. The typical form 
has the thorax chiefly rufous without longi- 
tudinal black vittae or black markings on the 
mesonotum. 
Head: The facial spots are circular to oval 
and are often somewhat pointed on the lower 
margin. The shape of the spots does not ap- 
pear to be of importance in distinguishing 
this species or in setting off varieties. Thorax: 
The ground color of the median portion of 
the mesonotum is yellowish (well differen- 
tiated from the cream-colored lateral vittae 
etc.), bounded on each side by reddish to 
reddish-brown. Specimens often have a pair 
of short brown to black stripes arising from 
between the outer and inner scapular bristles 
and extending about the length of the humer- 
us from the anterior margin of the mesono- 
tum. When these black marks extend the full 
length of the mesonotum, the specimen fits 
in the sarcocephali group. The humeri are 
clear yellow to cream colored. In some speci- 
mens they are discolored with brownish and 
definitely intergrade into the humeralis form. 
Wings: The most striking characteristic is the 
presence of microtrichia throughout the 
apical portion of the first costal cell and 
through all of the second. These two sections 
are usually brownish-fumose, concolorous 
with the costal band. In teneral specimens the 
brownish coloring may be absent, but the 
presence of the microtrichia (best seen at 
magnifications of 90 to 112 X) will differenti- 
ate the species. The costal band is distinct but 
extends only faintly below vein R3 except at 
the wing margin. The cubital streak is broad 
and well developed. It fills all of the basal 
portion of cell M4. The narrowed portion of 
the cubital cell is about one and one-third 
times longer than vein Cui+lst A in the 
females, and in the males the narrowed por- 
tion of the cell is slightly over two times 
longer than Cui+lst A. Abdomen: Variable in 
coloration, typically the third tergum is ail 
brownish to black, the fourth is brown to 
black on the sides, and the fifth is brown on 
the posterior lateral margins. A dark-colored 
vitta extends down the middle of terga 3 to 5. 
Tergum 2 has a brown to black subbasal band 
and the basal three-fourths of the first seg- 
ment is brown. In the specimens at hand the 
coloring of the abdomen varies from nearly 
all rufous to nearly all shining black. Ovi- 
