INSECTS AFFECTING PARK AND WOODLAND TKEKS 5^9 



the moths appearing in iht? fore part of NovemI>er, some wintering- in the 

 pupa. There are probably two or three broods during a season. 



Cecropia moth 



Siniiia cecropia Linn. 

 A large, pale green caterpillar about 4 inches long, ornamented with conspicuous 

 green, blue, yellow and red tubercles, feeds on the foliage of a large nunil)er of trees and 

 shrubs. 



The larva of this insect is very striking in appearance and were it at 

 all abundant its voracious appetite would result in a great deal of injury. 

 Ordinarily it is so rare that no repressive measures ai"e necessary. The 

 giant moth shown at plate 42, figure 2, is rather common, and of interest 

 largely because of its immense size. This insect has been recorded on 

 about 50 plants representing some 20 genera, the more important of w^hich 

 are the following : linden, maples, apple and pear, cherr\-, elm, birch, alder, 

 willow and poplar. 



Large maple spanworm 

 Sab 111 odes frajisversata Dru. 



A large, slender-bodied spanworm about i3/( inches long and marked with dark 

 purple brown and reddish markings, occurs on maples in Julv. 



-This species is rather common and typical of a large class of span or 

 measuring worms, which may be instantly recognized by their peculiar 

 looping walk and their tendency to remain motionless on twigs when dis- 

 covered. There are a great many species and alinost all are so shaped and 

 colored as to closely resemble the twigs on which they occur. 



The larva of this species has the body thickened behind and ridged on 

 the sides. It is a dark purple brown mixed with reddish and has a dull 

 reddish gray crescent-shaped spot on the middle of the fourth abdominal 

 segment, behind which is a pair of low kidney-shaped tubercles, and a pair 

 of dorsal pointed black ones on the eighth abdominal segment. 'I he 

 parent insect is a yellowish tawny color with a dark brown oblique stripe 

 extending from the apex of the fore wings to the middle of the anal margin 

 of the hind wings. Wing spread about 2 inches. 



