18 



NEW YORK STATE MUSEUM 



Fig. 22 Forest tent-caterpillar : a cluster of eggs; 

 b female; c top view of an egg; d side view of several 

 eggs (after Riley) 



30 Forest tent-caterpillar : maple worm (Clisiocampa dis- 

 stria). Foliage of maple and fruit trees eaten in May and June 

 by hairy blue headed caterpillars with silvery dots along the back. 



The cocoons are spun in 

 June, the brown moth, 

 with darker oblique bands 

 across the wings, flying in 

 July. Eggs in belts in- 

 circling smaller twigs are 

 covered with a light brown 

 protective substance, and 

 remain unhatched till 

 spring. 



Treatment: remove and destroy the eggs; kill the caterpillars 

 when massed on trunk and limbs, either by crushing or by spray- 

 ing them with kerosene emulsion or with whale oil soap solution; 

 spray the foliage of infested trees with poison; collect and destroy 

 the cocoons. 



31 Pigeon Tremex (T r e m e x c o 1 u m b a). The large, four 

 winged, brownish adults marked with yellow, frequently known 

 as '^ horn tails ", are usu- 

 ally found in July around 

 diseased and dying tree 

 trunks. The eggs are de- 

 posited a short distance 

 within the bark, and the 

 young borers occur near 

 the surface, but full grown 

 ones may make their way 

 to the center of even large 

 trees. This insect is not 

 usually very injurious. 



Treatment : cut and burn 

 badly infested trees. 



32 Lunate long sting (Thalessa lunator). A magnifi- 

 cent brownish, wasp-like insect, with yellow markings and a 



Fig. 23 Pigeon Tremex; a larva showing the 

 Thalessa larva fastened to its side; b head of larva; 

 c female pupa; d male pupa; e adult female (reduced 

 after Marx) 



