NOTES ON AUSTRALIAN MUSCOIDEA, VII. 
55 
Key to Subgenera of Calliphora Based upon Characters in the Aedeagus. 
1. Struts free at the apex and separated from each other at the base 
(as in figs. A and C respectively) . . . . . . . . . . 2 
Struts fused for their full length with the central tube of the 
aedeagus . . . . . . . . . . . . . . . . 3 
2. Struts tapering to a pointed apex to where the attached membrane 
reaches. Adichosia and probably Neocalliphora. 
Struts similar but the attached membrane is short (as in fig. A). 
Neopollenia stygia-g roup. 
Struts expanded at the apex and the attached membrane short. 
Calliphora. * 
3. Struts distinctly separated at their base (as in fig. C). 
Neopollenia (other groups) and froekon. 
Struts fused together at their base for an appreciable distance (as 
in fig. D but varying in length of fusion with the species). 
Onesia. 
Only some of the species of Onesia have been examined for the cited 
character and these conform, but it seems possible that gradations will be 
found in the future leading to N eo calliphora. 
Subgenus Adichosia. 
On C. ochracea Schiner, the aedeagus has its apical segment hinged 
in the normal way upon the basal segment which carries the spine (fig. 
A, sp.). The apical segment is in the form of a membranous central 
tube with the genital orifice at its apex, and is supported by four flanges, 
the bases of which are embedded in the membrane whence they arise 
and spread slightly outwards, retaining connection with the tube by 
membrane (fig. A, m./.) partly filled with fatty matter that gives rigidity 
to the whole segment. The rear pair of flanges is in the form of a pair 
of highly ehitinised struts (stippled in the figures), adjacent at their 
base, and ending in a curve that brings the apex of each strut into a 
socket on the anterior flange. The anterior flanges arise from the base 
and flank that bulging part of the central tube which pulsates when in 
action, and similarly they curve forwards, each ending in a point 
anteriorly directed. Another membrane is attached to these, joining 
them to the apical part of the central tube. 
Comparing this with C. erythrocephala and allied species, Patton 
(1935) described the aedeagus as having “the struts slender and ending 
in a similar expansion, but not free as on the European and American 
species ; the ends attached to membrane. ” If by this is meant not free 
from the anterior flange, then Patton evidently misunderstood the struc- 
ture ; further, the strut does not end in a similar expansion, but tapers 
to a point, as his drawing shows. The membrane attached to the strut 
differs from that of C. erythrocephala and also of the stygia-group (fig. 
A, m.f.) by reaching the apex of the strut, but this in no way 1 alters the 
relation between the strut and the anterior flange other than by making 
it not so easy to detach. This character has been confirmed on a male 
captured in Brisbane on the 5th July, 1945, the struts being released 
from their socket without breaking that attached membrane, the shape 
being like that of Patton’s drawing where it is traceable as slightly 
sinuous and without trace of an expansion. Patton gives two drawings 
of the condition on C. erythrocephala, in both of which the strut is shown 
as disconnected from the socket on the anterior flange; and the figure 
by Miller shows the strut retained in the socket. 
