3IO ECONOMIC ENTOMOLOGY 



stripes by greenish-yellow or white at the base; and elongated black spot 

 in each wing-cover. Eyes and median spot on head coal black; a dorsal 

 and two lateral black spots on thorax. Antennae golden yellow with 

 brownish markings; legs yellowish with tibiae and tarsi marked with 

 brown. Under surface of head and prothorax yellowish, that of meta- 

 thorax and abdomen black. Hibernates under rubbish and in shelters. 



Eggs. — Orange yellow, fusiform, attached by larger end; laid in 

 irregular rows in clusters on under surface of leaf in June; second brood 

 in July; hatch in 5-6 days. 



Larva. — When full grown },^ inch long, somewhat flattened, striped 

 dorsally and laterally with yellow stripes; tubercles prominent; under 

 surface yellowish. Black dominates in young stages. Duration 15- 

 20 days. 



Pupa. — Bright orange yellow, }i inch long; dorsal surface very con- 

 vex. Duration 7-24 days according to temperature. 



Control. — Spray when leaves are fully unfolded, and 3 weeks 

 later with arsenate of lead (3 lb. to 40 or 50 gal. water). 



Western Willow Leaf Beetle (Galerucella decora Say). — A serious 

 pest of willows and poplars in some of the prairie provinces and states. 

 Breeds chiefly in willows. 



Adult. — Small, dark yellowish or brownish, rather flat; ,^f g inch 

 long. Hibernates. May-June. 



Eggs. — ^Laid on the leaves of willow and poplar. 



Larva. — Both larva and adult feed on the leaves. 



Control. — -Spray the grubs with arsenical and lime. When adults 

 occur in large numbers keep them from the most valuable trees with 

 smudges of damp manure, etc., and spray with lead arsenate (4 lb. to 

 50 gal. of water). 



The following four Chrysomelids also are injurious to willows and 

 cotton woods in the northern prairie sections: 



Cherry Leaf Beetle (Galerucella cavicollis Lee.) did considerable in- 

 jury in 191 5 to cherry and peach trees in New York, Pennsylvania 

 and West Virginia. The adults attack the leaves. 



Streaked Cottonwood Leaf Beetle {Lina scripta Fab.) having dull 

 reddish or greenish-yellow elytra with elongate black spots, and sides 

 of thorax yellow and disk dark metallic green. 



Unspotted Aspen Leaf Beetle {Lina tremulce Fab.) with dull yellow 

 elytra without spots, and thorax green. 



