GENERAL ACCOUNT OF INSECTS. 



Insects belong to a group of animals calle 

 Arthropoda jointed-limbed animals. 



These jointed-limbed animals are very varied in 

 structure, habits, and development. 



Amongst this group of diverse forms we find such 

 as the Crabs, Lobsters, Shrimps, Woodlice, Spiders, 

 Ticks, Red Spiders, Harvest Bugs, Centipedes, Mille- 

 pepes, and the true Insects. 



All this assemblage of forms can be told from other 

 animals by their segmented bodies, accompanied by 

 two or more pairs of jointed limbs and other 

 jointed structures attached to the head. As this little 

 manual deals only with the true Insect Enemies of the 

 Rose, it is necessary to point out what are the differences 

 between true insects and the other jointed-limbed 

 animals. These creatures are divided by Zoologists 

 into four groups known as Crustacea, Arachnoidea, 

 Myriapoda and Hexapoda. 



Briefly they may be told by the following characters : 



A. CRUSTACEA (Crabs, Lobsters, Woodlice, &c. 

 Mainly aquatic. The body is roughly divided into 

 two regions, the so-called cephalo-thorax (head and 

 thorax) and abdomen. There are organs of 

 locomotion attached to the lower side of most of the 

 segments of the body and they breathe by means 

 of gills. 



