34 
Records of the Australian Museum (2009) Vol. 61 
female fore-femora 
posterior view 
female fore-femora 
anterior view 
male fore-femora 
anterior view 
Figures 1-11. Fore-femora of Drosophila setifemur, D. sulfurigaster and D. immigrans showing sexual dimorphism in D. setifemur and 
setation on anteroventral and posteroventral surfaces. (1-5) Drosophila setifemur. (1), D. dispar Mather ( =D. setifemur Malloch) allotype 
female, Samford, Queensland, AMS K67820; (2), D. dispar Mather paratype female, Samford, Queensland, AMS K67825; (3), D. dispar 
holotype male, Samford, Queensland, AMS K67819; ( 4 ) and (5) (the latter is a ventral view showing both anterior and posterior setation 
of fore-femur), D. setifemur female paratype, Sydney, AMS K50090. (6-8) Drosophila sulfurigaster : ( 6 ) and (7), female, Malololelei, 
Samoa, McE 21321; (8), male, AMS K 234064, Maple Creek, near Innisfail, Queensland. (9-11) Drosophila immigrans : (9) and (10), 
female, near Ebor, New South Wales, AMS K234065; (11), male, Sydney, AMS K234066. Scale 0.5 mm. 
longest one, at apex, not longer than the femoral diameter”. 
This is not a reference to the seriate spinescent setulae on 
the anteroventral surface. Female fore-femur not swollen, 
without brush of erect setulae below as in males (compare 
Fig. 2 and 3); anteroventrally with seriate spinescent setulae 
(Figs. 2 and 5). 
Abdomen glossy, blackish-brown, paler basally, becoming 
black apically. Halteres yellow. 
Wings (D. setifemur holotype AMS K50090). Hyaline. 
C-index = 2.38; 4v-index = 2.04; 5v-index = 1.76; 4c-index = 
1.12; ac-index 2.57; M-index = 0.61; third costal section with 
fringe of heavy setation on basal 0.67. Length, from humeral 
crossvein to apex, 2.2 mm (from axis to apex, c. 2.5 mm). 
Male terminalia. Cercus very small with very long finger-like 
process extending from below (Mather, 1955, fig. 11C; Bock, 
1976, fig. 9); the latter is translucent (not heavily sclerotized), 
strongly curved, tapering to a point, and protrudes well 
outside the body making it, and the opposing one, clearly 
visible under low magnification. Under high magnification 
several sensilla are visible on these processes subapically. 
Aedeagus with prominent subapical ornamentation. 
Distribution. Type locality is Sydney, Australia where the 
species is taken frequently at fruit baits in urban bushland 
(Table 1). This species has been collected at numerous sites 
in eastern Australia (see above) from northern Queensland at 
the summit of Mt Bellenden Ker (1561 m) to Femtree Gully, 
outer eastern suburb of Melbourne, Victoria. It apparently 
does not overlap with the range of D. prodispar Parsons & 
Bock, 1982, in western Victoria. 
Notes 
Drosophila setifemur closely resembles D. prodispar and 
is therefore probably closely related to it. The structure 
of the male and female terminalia, the sexually dimorphic 
fore-femur and the generally dark coloration of these flies 
make them quite unlike others in the Drosophila subgenus 
Sophophora. 
