HOW TO KNOW THE IMMATURE INSECTS 



133a. More than 1 ocellus on each side of head, usually 5 or 6 ocelli, 

 antenna 3-segmented 134 



133b. 1 ocellus on each side, or none; antenna 2-segmented or less. 

 Fig. 341 Subfamily Galerucinae*, CHRYSOMELIDAE 



Their larval habits are varied, many 

 feed openly on the parenchyma of 

 leaves, others live in roots, and a num- 

 ber are leaf-miners. It is a large and 



Fig. 341. Larger elm leaf x x i-x -i 



beetle, Monocesto eoryli unportant subfamily. 



(Say). 



134a. First 8 abdominal segments with ambulatory warts on ventral 

 region; anal opening dorsal; labial palpus 1 -segmented. 

 Fig. 342 Subfamily Criocerinae*, CHRYSOMELIDAE 



Their larvae are fleshy grubs 

 which feed externally on the 

 leaves. Some have the habit 

 of concealing themselves with 

 coverings of excrement. The 

 asparagus beetle, Criocens as- 

 paragi (L.) is familiar to grow- 

 ers of asparagus. 



&- 



Fig. 342. Asparagus beetle, Crioceris 

 asparagi (L. ); b. Labium. 



134b. Fiist 8 abdominal segments without any ambulatory warts; anal 

 opening ventral and placed in the middle of the sucking disk of 

 the 10th abdominal segment; labial palpus 2-segmented. 

 Fig. 343 Subfamily Chrysomelinae*, CHRYSOMELIDAE 



This family Chrysomel- 

 idae is one of the four 

 largest of the order, com- 

 prising more than 25,000 

 species. The larvae feed 

 on leaves, roots, or live 

 in stems, in galls, in leaf 

 mines, in ants' nests and 

 some are aquatic species. 

 They are most destructive 

 insects to agricultural 

 crops. This subfamily con- 

 tains some common and 

 very interesting species. 





Fig. 343. 

 Labium. 



o, Myochrous denticolli Say; b, 



124 



