CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS I37 



noticeably longer than body; hairs on 

 antennae and body usually knobbed; 

 most species living solitary or scat- 

 tered on host. — Callipterini (includes 

 Myzocallis, Calliptcriis, Euceraphis 

 et al.).' 



Fig. 88. — Types of cornicles among the aphids. Beginning from left, 

 Aphis avence, A. brassicce, A. gossypii, Chailophorus ncgundinis, Hyadaphis sp., 

 Liosotnaphis sp. 



FF. Cornicles short to very long but not tuberculate ; 

 Cauda not globular or knobbed. 

 G. First antennal segment gibbous on inner 

 side. 



Fig. 89. — Front of head and cauda of two aphids: a, Rho palosi phiim; b, Aphis. 



H. Frontal or antennal tubercles with 

 a prominent tooth-like projection 

 on inner side; cauda tapering. — 

 Phorodon. 

 ' See Can. Enl., Vol. 42, No. 8. 



