306 ECONOMIC ENTOMOLOGY 



Ei^gs. — Smooth, white, oval; laid singly (24-36) a few inches below 

 the surface of the ground; hatch in 2-3 weeks. 



Larva. — Yellowish- white with a pale brown head; ^^ inch long 

 when full grown; white-grub like; matures in autumn and hibernates 

 in the ground. Feeds on the roots of grasses in sandy areas. 



Pupa. — Pupal stage entered. in sprng and lasts for 10-30 days; 

 ^i inch long, yellowish brown. 



Control. — Spray trees with arsenate of lead sweetened with molasses. 



CHRYSOMELID^ (LEAF BEETLES) 



Common Economic Genera (after Leconte and Horn) : 



A. Head produced; thorax narrower than elytra; mandibles simple, pointed. — 

 (Criocerini). 



B. Thorax cylindrical, not constricted. — Crioceris. 

 BB. Thorax constricted. — Lema. 

 AA. Head inserted in the thorax to the eyes; thorax as broad as the elytra; 

 mandibles with several teeth. 

 B. Last dorsal segment of abdomen not exposed. 

 C. Antennae widely separated at base. 



D. Front coxas transverse. — Leptinotarsa (Chrysomelini). 

 DD. Front coxas rounded; 3d tarsal joint bi-lobed. — Fidia 

 (Eumolpini). 

 CC. Antenn£e rather close at base; front coxae conical. 



D. Hind thighs slender and front coxal cavities open behind. — 

 (Galerucini). 



E. All the tibiae without terminal spurs. — Galerucella. 

 EE. Middle and hind tibiae with terminal spurs. — Diahrotica. 

 DD. Hind thighs thickened. — (Halticini). 

 E. Front coxal cavities open behind. 



F. Thorax with a feeble transverse impression on 

 basal half; hind tibiae with a short terminal spur. 

 — Hallica. 

 FF. Thorax without a transverse impression near the 

 base. 

 G. First joint of hind tarsus short and rather 

 broad; claws appendiculate. — Disonycha. 

 GG. First joint of hind tarsus long and slender; 

 claws simple; elytra usually with a yellow 

 stripe or spots. — Phyllotreta. 

 EE. Front coxal cavities closed behind. 



F. Antennae ii-jointed; claws appendiculate. 



G. Thorax with a distinct transverse impression 

 near base. 

 H. Elytra without hairs. — Crepidodera. 



