INSECTS INJURIOUS TO ORCHARD TREES 429 



of the United States. There are two species, the spring canker- 

 worm, Paleacrita vernata, which has only one pair of abdominal 



FIG. 202. A trio of apple tent-caterpillars, larvae of the moth Mala- 

 cosoma amcricana. These caterpillars make the large unsightly webs or 

 tents in the apple trees, a colony of the caterpillars living in each tent. 

 (Natural size; after Slingerland.) 



legs, and the fall canker-worm, Also p// Ha pometaria, which 

 has two pairs. Otherwise they are very similar in appearance. 



