DESCRIPTION OF PIRATES, 



Plate I. — Area over which the caterpillars were most destructive in 

 Neii' York State during i8gg. 



Plate II. — I. Egg masses, natural size. 2. Caterpillars at rest 

 , during the heat of the day. j. Cocoon between two elm leaves, 

 natural size. (Original.) 



Plate III. — I. Nest of apple-tree tent-caterpillars containing both 

 species. 2. Showing principal difference in markings between the 

 two species. The one on the left is the apple-tree tent-caterpillar, all 

 about two-thirds grown. Natural size. (Original.') 



Plate IV. — Young caterpillars congregated upon a small basswood 

 branch. ( Origina I. ) 



Plate V. — Caterpillars congregated upon trunk of plum tree pre- 

 paring for last molt. ( Original. ) 



Plate VI. — First two rows, male and female moths of QXisio- 

 campa disstria Htibn, shoicing markings and variation in size. 

 Third row, C. disstria var. sylvatica Harr ; the two on the left are 

 males and the third a female. Fourth row, C. disstria var. thoraci- 

 coides, Neumoegen and Dyar ; all males. Fifth row shows grada- 

 tion from light form zoith two narrow dark lines across each fore 

 wing to dark form with dark band across the wings ; all mules. 

 All natural size. (Original.) 



