HOW TO KNOW THE IMMATURE INSECTS 



35a. Lacinia and galea separate. Fig. 211. 



36 



Fig. 211. Maxilla. 



35b. Lacinia and galea fused. Fig. 212 Family SCARABAEIDAE 



About 15,000 species are known in this very- 

 large family. The larvae are typicqlly scarabaeoid 

 type, living mostly in the soil and feeding upon 

 plant tissues, but some forms are recorded as being 

 myrmecophilous. The white grubs are best known 

 larval pests while the Japanese beetle, June 

 beetle and rose chafer are the serious adult pests. 

 The world's largest beetles belong here, and of 

 course the largest grubs. 



Fig. 212. Anomala 

 kansanas Hayes 



b McColloch. 



One fairly large and widely represented group within this family, 

 the Tumble bugs, are unique in their method of providing for their 

 young. A pair of beetles make a large ball of mammalian dung 

 which they roll, often for a considerable distance, and bury in an 

 excavation which they prepare. An egg is laid in the ball and the 

 grub makes its entire growth within the ball. 



36a. Stridulating organs absent. Fig. 213 Family TROGIDAE 



It is a small family composed of three 

 genera and about 160 species. They most- 

 ly live in dried decomposing animal mat- 

 ter, and may be found in carrion. 



' (L 



Fig. 213. o, Trox scobcr L.; 



b. Antenna. 



