114 New York State College of Forestry 



Fourth Nymphal Stage (Plate V, Fig. g) : Tubercles moder- 

 ately large, each bearing several spines. Prothorax considerably 

 larger, the mesothoracic wing-pads quite prominent. Small 

 spicules have appeared on the bases of large spines. Length, 

 1.68 mm. ; width, .76 mm. General color, dark brown, the base 

 of the abdomen with a lighter area. Length of instar, five to 

 twelve days. 



Fifth Nymphal Stage (Plate V, Fig. /;) : Tubercles on the 

 head quite large and prominent, each bearing several spines. 

 Tubercles and spines much larger. Spinules present as in the pre- 

 ceding instar. Prothorax very prominent, the median anterior 

 portion considerably raised and inflated, mesothoracic wing-pads 

 very large, completely covering metathoracic wing-pads and 

 extending on the fourth abdominal segment. Spines on lateral 

 margins of abdominal segments covered by wing-pads wanting. 

 Length, 2.2 mm.; width, 1.3 mm. The general color is dark brown, 

 the yellowish areas on the prothorax, wing-pads and base of the 

 abdomen have increased in size. Length of instar, eight to fifteen 

 days. 



