80 



REMEDIAL TREATMENT. 



Like the fall web-worm this is a gnawing insect, and 

 may be destroyed by spraying with London purple or 

 Paris green. The important fact in its life-history is 

 this : The worms which injure a given tree are largely 

 in the egg state in cases attached to the twigs of this 

 tree during the preceding winter. It sometimes involves 

 considerable labor to do this, but for the evergreens 

 (chiefly red cedar and arbor vitse) from which this pest 

 spreads it is not very difficult to remove and burn the 

 cases . For other trees also this will generally prove the 

 cheapest and most effective remedy, and it may be un- 

 dertaken with the satisfaction of knowing that once the 

 sacks are removed there is no immediate danger of the 

 trees becoming infested to an injurious extent. 



Several small four winged parasites attack the worms, 

 but these emerge in the fall, as far as I have had an 

 opportunity to observe, and hence there need be no 

 hesitation in burning the cases during the winter. 



The Catalpa Sphinx. 



[Sphinx catalpse). 



Fig. 10. (On^opposite page.) The catalpa sphinx, a, egg mass; 

 6, 6, youDg larvEe soon alter hatching ; c, young larva ; d, view of one 

 of its divisions enlarged ; e, f, h, larvse, the last fully grown ; g, i, 

 views of divisions of body:j, pupa; pupa; /c, adult moth. (From 



Marx.) 



During the summer of 1893 scattered catalpa trees in 

 Eastern Kentucky were stripped of most of their leaves 

 by a caterpillar resembling in shape the tobacco-worm. 

 It is in fact a member of the same family as the latter. 

 But it differs from the tobacco-eating worm in having 

 a black head and a broad longitudinal stripe of velvety 

 black occupying the middle of its back, a slender white 

 line running parallel with each of its edges . The sides 

 are sulphur-yellow dotted with black, while the under 



