237 
/ 
with a keyhole-like mark on the apex. D. eucalypti aborts the young Eucalypts into 
gouty swellings in which a number of larvae feed and pupate. There are certain red 
rounded shot-like galls of the Eucalyptus, generally several in number on the midrib 
of the leaf, which, on account of the pupal skins always remaining in the holes in the 
sides of the galls through which the flies have escaped, can be easily distinguished from 
many very similar ones that are the work of micro-hymenoptera. These are formed 
by a large stout gnat named Hormomyia omalantJii by Skuse, who first obtained 
specimens from galls on the under side of the leaves of Omalanthus populifolius. 
Laaioptera miscella aborts the leaf stalks of Eucalyptus hmmastoma, one of our white- 
stemmed Gums growing about Botany, N.S.W., with its irregular swellings (Froggatt, 
p. 286). 
It was bred from malformed coalescent leaf-stalks of E. JuBmastoma at Botany. 
See Plate XVI, also " Diptera of Australia " (F. A. A. Skuse, Proc. Linn. Soc. N.S.W., 
xv, 373, 1890). 
Family Muscidae Acalyptera (Agromyzidae) . 
These are small yellow flies, sometimes marked with green ; they puncture the 
tissue of plants and cause excrescences and galls upon the foliage and flower-buds. 
One tiny species, Agromyza sp., attacks the midrib of the leaves of theBloodwood 
(E. corymbosa) about Sydney, producing soft yellow spongy excrescences aborting all 
the young foliage ( Froggatt, 309). And again, " A number of species of this genus produce 
fleshy galls upon the foliage of our Eucalypts. One is very common upon the foliage 
of the Bloodwood (Eucalyptus corymbosa), attacking the midrib of the young leaves, 
and causing them to be thickened swollen masses." (Froggatt, in Agric. Gaz. N.S.W., 
ix, 390, 1898.) 
Mr. R. H. Cambage (Proc. Linn. Soc. N.S.W., xliii, 687, fig., 688) shows the 
effect of Agromyzidae on Eucalyptus dealbata buds. I have drawn attention to this 
swelling of Eucalyptus buds, and have so often seen it in buds belonging to the 
E. tereticornis group that it is to some extent characteristic of that group. 
Agromyza galls swell the fruits of E. hcemastoma at Hornsby (W. F. Blakely). 
They swell the buds of E. Moorei at Leura, Blue Mountains (H. Bott). 
A dipterous fly produces a spheroidal gall, -inch diameter, on the thin branches 
of E. Parramattensis. George's River, Cabramatta, near Sydney (W. F. Blakely). 
On E. Sieberiana I have seen galls at Bumble Bay Trig. Reserve, 1,154 feet 
elevation, Ourimbah State Forest (W. A. W. de Beuzeville). 
It commonly misshapes the flower-buds of E. tereticornis as already stated. 
(To be concluded.) 
