Annual Meeting. 
53. 
I.A. N%T.. VOL. XIV. 
Fec^uarv, 1933. 
3. DIPTERA — ^l\vo-winged. 
a Flies of all sorts come under this heading and they all' 
have only one pair of wings. Although the>\form food 
for certain birds, they are in general a pest both to^ 
mankind and animals. The study of them is an econ- 
omic necessity as they arc germ and disease carriers, 
f. COLEOPd’ERA — Sheath-winged, one pair covering the other 
more delicate organs. 
a Beetles form a very large class. Some are useful, such 
as the lady bird w'hich destroys the scale insect attack- 
ing orange trees. Others are [)csts which bore into 
wood and furniture and cause much damage. 
5. HEMIPTERA— Half-winged. 
a Bugs, plant and body lice, etc. form this group. Some are- 
injurious to crops and fruit and the entomologist lias to 
know his hugs to be able to cc)mbat their ravages. 
6. OR I’HOIH’ERA — Straigiit-winged. 
a (Jrasshoppers. locusts, crickets, walking-stick insects, kat- 
ydids, maiuids and cockroaches all come within this 
group. We know' them mostly as harmful pests but I 
suppose they \Aa.y some part in the economy of nature. 
Many birds feed on grasshoppers. 
7. NEUROPTERA — Nerve-winged. These creatures haVe 4 
naked membranous transparent wings with net-Hke veins 
or nerv^es. 
a White ants, may tiles, dragon flics (wrongly called horse- 
stingers, but they liave no sting therefore they cannot 
sting horses) and scorpion flics belonir to this family. 
8. THVSAXURA— Shield-tailed. 
a Bristle tails and spring tails belong here, and they are a 
class about wdiich the average person knows nothing. 
1 read a recent article in “The Victorian Naturalist”' 
with regard to the spring tails. 
III. THE MINERAL KINGDOM. 
I am not qualified to speak on this subject, but as a field 
naturalist one picks up a little knowledge here and there. Some 
lines of study in this large and important economic branch of 
field work arc these: — 
1. MINERALOGY. — The study of tlie rocks as specimens of the 
ear til 's crust. Y hether it be of igneous or volcanic origin 
or whether formed by deposition and hence called sedi- 
mentary. 'rheir structure and grain would come under- 
this study. 
