8 Report of the Entomologists. 



DESCRIPTION OF PLATES. 



Plate XX. — Area over which the caterpillars were most de- 

 structive in New York State during 1899. 



Plate XXI. — 1. Egg mases, natural size. 2. Caterpillars at 

 rest during the heat of the day. 3. Cocoon between two elm leaves, 

 natural size. (Original.) 



Plate XXII. — 1. Nest of apple-tree tent-caterpillars containing 

 both species. 2. Showing principal dijference in markings be- 

 tween the two species. The one on the left is the apple-tree tent- 

 caterpillar, all about two-thirds grown. Natural size. {Orig- 

 inal. ) 



Plate XXIII. — Young caterpillars congregated upon a small 

 basswood branch. {Original.') 



Plate XXIV. — Caterpillars congregated upon trunk of plum 

 tree preparing for last molt. {Original.) 



Plate XXV. — First two rows male and female moths of Clisio- 

 campa, disstria Hubn, showing markings and variation in size. 

 Third row, C. disstria var. sylvatica Ilarr; 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 with two narrow dark lines across each fore 

 wing to dark form ivith dark band across the wings; all males. 

 All natural size. {Original.) 



