1370 
DIPTERA OF AUSTRALIA, 
third longitudinal; middle cross-vein joining the third longitu- 
dinal a little beyond the base of the fork ; the rest as in the 
Hob . — Xew Holland (Walker) ; East coast of Xew Holland, 
5, Tasmania (Macquart) ; Sydney (Xovara Exp.), common 
(Masters and Skuse) ; Knapsack Gully, Blue Mountains (Masters); 
Saddleback Mountain, near Kiama (Skuse); also New Zealand 
(Novara Exp.). September to January. Many specimens taken 
in copula. 
Obs. — This is without doubt the B. imitator of Walker, and 
most probably also his B. substitutus, but the description of the 
latter is too imperfect to be of any use. Schiner’s B. helioscojns 
only diffei-sin the colour of the halteres, but surely that is scarcely 
sufficient to constitute more than a mere variety ; in many of my 
specimens the halteres are. tinged with black, but this I attribute 
to their age. Macquart has described each sex under a different 
name evidently because he received his specimens from two 
distinct localities. 
175. Bibio substitutus. Walker. 
B. substitutus, Walk., List. Dipt. Brit. Mus. 1848, Part I. 
p. 121. 
“ 9. — Irutea, capite piceo, antennis pedibusqu^ nigris, coxis 
luteis, alis nigro-fuscis. 
“ Body orange ; head piceous ; feelers and eyes black ; legs 
black ; hips orange ; wings dark brown ; brands indistinct ; fore 
border veins brown, the other veins tawny ; poisers orange. 
Length of the body 3 lines., of the wings 7 lines. 
“ New Holland.” 
176. Bibio Marci, Geoffr. 
B. JIarci, Geoffroy, Hist. Nat. des Ins. II., 1764, p. 571, 3; 
Loew, Linn. Entom. I. 1846, p. 343, 2. 
specimens completely re.sembling those of Europe were 
found by Macquart amongst the Diptera collected on the east 
