46 
The Queensland Naturalist June, 1939 
showing* the volcanic rocks in contact with the sedimentary 
rocks. 
E. 0. MARKS. 
ENTOMOLOGY. 
Generally speaking, the insects were not as numerous 
as on the previous trip held in 1936. Since then many 
acres of forest have been cleared, reducing the insect 
population considerably. The long dry summer followed 
by heavy rains (resulting in the scouring of the creeks) 
also affected the insects. 
As usual the dragon flies (Odonata) were very con- 
spicuous, and species like Orthetrum caledonicum , 0. 
villosavittatum , Diplacodes haqmatodes , Synthemis regina, 
Austrogomphus achraceus, Argiolestes icteromelas were 
particularly common. Rarer species like Diphlebia 
lestoides , Synlestes weyersi, etc., were not seen. 
May flies (Ephemeroptera) were very common near 
the river, and a fine specimen of Siphonluridae was taken 
at the camp light. This is the first record of this family 
for Queensland. Two very fine larvae, which are thought 
to be the larvae of the same species, were found in the 
gravel in the creek. 
The stone flies (Plecoptera) were rare, only two 
specimens were taken, both at night. They were two 
species of Leptoperlidae. Many larvae of both Sternoperla 
australis and Leptoperlidae were found under stones in 
the stream. 
Only two specimens of Taeniochorista pallida (Mecop- 
tera) were found. Usually a number of specimens of this 
rare and interesting species are caught at Easter. 
The only Neuroptera collected were three specimens 
of Eidoleon bistrigatus , the large ant-lion with the peculiar 
linear marking on the fore wings. In 1936 three or four 
specimens of a rare species of Osmylidae were taken, but 
none were seen on this occasion. 
The beetles were, as usual, fairly plentiful, but all of 
those collected were quite common species. 
The most interesting fly was a large brown and black 
tachinid with smoky wings. It has not yet been identified. 
The Hemiptera, Orthoptera, and Lepidoptera were 
numerous, but of no particular interest. 
A great deal of time was devoted to studying the 
Arthropods found under bark and logs. After the heavy 
rains, the water-table was very near the surface, with the 
result that many forms not usually seen were exposed 
