CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 1 83 



Control. — Prune off and burn the webs; spray with arsenical; collect 

 and destroy the cocoons. 



Hickory Tiger Moth {Halisidota caryce Harris). — (Consult Bull. 598, 

 U. S. Dep. Ag.) Adult. — A yellow and brown moth, 2 inches wing 

 expanse; fore wings long, narrow and pointed, ochre-yellow with five 

 irregular transverse incomplete rows of spots. June- July. One brood 

 a year. Distributed over the Northeastern States and the Eastern 

 provinces of Canada. 



Eggs. — Blue and nearly globular a brown ring on upper surface; laid 

 in patches of 100 or more on under side of leaf in early summer. 

 Duration 15-16 days. 



Larva. — One and one-half inches long; gregarious at first; feeds 

 on the leaves of hickory, butternut, apple and other trees; covered with 

 dense and spreading tufts of white hairs, has a row of 8 black tufts on 

 the back and two long slender black pencils on the fourth and tenth 

 segments; head, feet and under surface of body black ; upper surf ace of 

 body white with black dots. Eight to nine feeding stages, and about 

 a week as larva in the cocoon. Larvae feed gregariously during the 

 first four stages. Duration 70-90 days. 



Pupa. — ^Cocoon greyish, oval, hairy, ^ inch long, found under boards 

 and rubbish on the ground; pupa reddish-brown, caudal end with a 

 transverse row of spines. 



Checkered Tiger Moth {Halisidota tessellaris Sm. and A.). — ^Like 

 preceding species but tufts are yellow; two orange colored pencils on 

 second and third segments; two white pencils on sides of third and 

 eleventh segments. 



Spotted Halisidota {H. maculata Harris) .^ — Larva with yellow tufts 

 in the middle and black tufts at either end, and a row of black spots 

 down the centre. Occurs on apple, maple, birch, alder, poplar, oak, 

 etc. Cocoon is yellowish, oval and hairy. 



Parasites of Cocoons. — Scambus pedalis, Theronia melanocephala, 

 Amblyteles malacus. 



AGARISTID^ (WOOD MOTHS) 



Eight-spotted Forester {Alypia odomaculata Fab.). — A frequent 

 feeder on the leaves of wild and cultivated grapes, and Virginia creeper 

 in eastern U. S. and Canada, sometimes doing considerable injury. 



