Australian Fruit Flies — Hardy 
131 
Fig. 6. Dacus {Gymnodacus) calophylli (Perkins and 
May): a, female ovipositor, full length; b, apex of ovi- 
positor. 
positor (Fig. 6a) is just slightly over 3 mm. in 
length. The piercer is about 1.0 mm. long by 
0.13 mm. at its widest point. It is constricted 
at its base (Fig. 6a) and gradually tapered be- 
yond the middle. The oviduct ends at about 
the apical two-thirds of the piercer, a distance 
of approximately 0.34 mm. from the apex. 
The setae are inconspicuous (Fig. 6b) and 
are situated 0.05 mm. from the apex of the 
piercer. The inversion membrane is just 
slightly over 1 mm. in length by 0.3 mm. in 
width. The scales of the rasper are sharp 
pointed and extend to within 0.22 mm. from 
the base of segment 8. The basal segment 
is about 1.1 mm. long, and the spiracles are 
approximately 0.3 mm. from the base of the 
segment. 
TYPE LOCALITY: Caims, Queensland, ex 
Calophyllum imphyllum Linn. 
Type at the University of Queensland. 
Several hundred specimens were received 
from Krauss, collected at Cairns, ex Calophyl- 
lum imphyllum, June-Sept., 1949. 
Dacus (Hemizeugodacus) n. subgen. 
The species at hand represents a borderline 
group which shows definite linkage with 
other subgenera (genera of authors). Fol- 
lowing the concepts of other writers this 
group would constitute a distinct genus. 
Variations in the specimens of D. {Hemizeugo- 
dacus) algaiae n. sp. in the Krauss collection 
illustrate clearly, as do many other similar 
cases which have come to light during studies 
of large numbers of Dacinae, that various 
chaetotaxic characters which have been given 
generic importance are of not more than 
subgeneric value. 
Dacus {Hemizeugodacus) is related to the sub- 
genus Farazeugodacus Shiraki because of the 
presence of four scutellar and two prescutellar 
bristles, the presence of cilia on the third 
abdominal tergum of the male, and the lack 
of a distinct supernumerary lobe in the wings 
of the male. It differs from Parazeugodacus 
and related subgenera by lacking the anterior 
supra-alar bristles. In one specimen at hand 
a tiny rudimentary anterior supra-alar bristle 
is present on the left side, showing definite 
intergradation toward Parazeugodacus, In all 
other specimens studied, both anterior supra- 
alar bristles are completely lacking. In many 
respects Hemizeugodacus is similar to Afro- 
dacus, but differs by having the four well- 
developed scutellar bristles and by lacking 
the supernumerary lobe in the wings of the 
males. It is also very similar to Austrodacus 
but differs by having prescutellar bristles 
and by having cilia on the third abdominal 
tergum of the male. Hemizeugodacus differs 
from Zeugodacus by lacking the anterior supra- 
alar bristles and by the poorly developed 
supernumerary lobe in the male wing; how- 
ever, the shaggy hairs and closely set micro- 
trichia are present. 
GENOTYPE: Dacus {Hemizeugodacus) algaiae 
n. sp. 
