558 



NEW YORK STATE MUSEUM 



The later stages of this sawfly have been characterized by Dr Dyar as 

 follows : 



Larva. Head whitish, scarcely shining, eye black, mouth brown ; a 

 green tint by transparency ; width 1.5 mm. Body smooth, not shining, 

 faintly 4-annulated, translucent, leaf-green, the pulsating edges of the dorsal 

 vessel forming a geminate white dorsal line, filled in with the darker green 

 blood, the anal end usually touched with crimson ; segmental incisures a 

 little folded, forming transverse whitish bands when the segments are 

 retracted; tracheal line evident; thoracic feet clear, moderately spreading, 

 abdominal ones small, present on joints 6-1 1 and 13. 



Last stage. As before, but the head is shining, with brown dots; body 

 also more shiny ; width of head the same as before ; the larvae form brown 

 cocoons in the earth. 



The female is \\ inch in length, black marked with yellowish. 



Bibliography 



1895 Dyar, H. G. Am. Ent. Soc. Trans. 22 : 301 



1896 Marlatt, C. L. U. S. Dep't Agric. Div. Ent. Tech. Ser. 3, p. 11 5-1 6 



Poplar leaf beetle 



Pliytodccta pallida Linn. 

 A pale brown, black-spotted beetle about ]{ inch long, is occasionally destructive to 

 willow and poplar. 



This species, according to Mr Chittenden, ranges 

 across the continent from the White mountains of 

 New Hampshire through the Lake Superior region, 

 Wyoming and Utah to California and British Colum- 

 bia. It has been observed in injurious numbers in 

 Michigan, occurring in early June in such abundance 

 as to skeletonize the leaves and inflict serious injuries 

 to the trees. Its coloration is more or less variable, 



Fig. 138 Poplar leaf lieetlc, 



phytodecta pallida, ^j^^ \\\l& Other leaf feeding insects, it may be controlled 



five times natural size. (After ^ ^ 



chittenden.u.s. Dep't Agric. ^j^h arscnical poisons. 



Bur. For. Bui. 46. 1904) ^ 



