220 Journal New York Entomological Society. [Voi. xxv. 



the length of each nymphal stage was as follows: First, four days; 

 second, five days; third, six days; fourth, five days; fifth, six days. 

 This makes a total of 26 days or almost one month for all nymphal 

 stages. In the field conditions closely approached this, thirty days 

 being required according to field observations. After hatching, the 

 nymphs make their way to the terminal leaves on the twigs and can 

 be found usually on the under sides but to a certain extent on the 

 upper. Where many are present, the upper surface of the leaf be- 

 comes characteristically whitish and discolored. Upon reaching the 

 fourth stage, the nymphs scatter and many of them are found on the 

 twigs resting with their heads downward. The nymphs in the later 

 stages are very active and move rapidly when disturbed and like some 

 other species move to the side of the twig away from the observer. 

 This habit is also common with the adults. After emergence, the 

 adults also scatter and can be found on all parts of the trees. Trees 

 from 20 to 25 feet high were found to have fourth- and fifth-stage 

 nymphs and adults on the topmost branches. 



During the last few days of June adults of the first brood were 

 quite plentiful, most of them preferring to rest on the twigs where 

 they could be found without difficulty. By the end of the first week 

 in July many eggs were being laid. These summer eggs required 

 about two weeks for hatching and by August 2-^, seventy-five per cent, 

 of a second brood of adults had emerged and a few overwintering 

 eggs were being laid. Like the first brood of adults, these also scat- 

 tered over the trees. 



During &g% deposition, the female rests parallel to the twig with 

 her head pointing toward the top and her ovipositor inserted at right 

 angles in the bark tissue under the bud, the tissue of the twig being 

 torn into a slit-like opening. The operation of egg-laying also causes 

 a similar slit to appear on the other side of the bud. Females col- 

 lected June 29 and dissected showed eggs just starting to develop or 

 partly developed and at this time, the ovaries in each female con- 

 tained from 19 to 22 eggs. On July 14, when egg-laying was well 

 under way, the number of eggs found in dissected females varied 

 from 8 to 20. It was not possible at any time in the season to find 

 more than 22 eggs and this probably represents the maximum num- 

 ber, as a number of dissections were made. 



Inasmuch as the eggs are usually deposited in groups of three, 



