66 Journal New York Entomological Society. ^^'°^- ^^• 



smaller nymphs found on oak, produced in confinement, on July 5, 

 only males, while the large ones from walnut produced females ex- 

 clusively on July 4. Of the two nymphs collected July 6, one produced 

 a female on the following day, the other was killed. Notwithstanding 

 the light color of the nymphs all the imagines were of a beautiful dark 

 color. The prothoracic prominence is in the females always longer 

 and in some of the males very short, but on walnut I noticed that the 

 males had the prominence similar to that of the female, although the 

 insect was smaller. 



This season while looking for nymphs I found on oak only one 

 Enchenopa binotata nymph on June 23, another on walnut on June 

 30, at Roselle, N. J. The former was exactly of the color of a 

 Campylcnchia curvata nymph, green and brown, and only differed 

 in the form of the abdominal prominences. The insect from walnut 

 was more similar to those collected last year at Newark, only less 

 brown and more pink-red on the fore parts ; the abdomen was more 

 downy yellowish-green with the prominences, anal region and tibiae 

 of a salmon color. The abdominal prominences are very small in the 

 first stage, become longer, slightly curved and directed backward in 

 the following and persist also in the form of very small rudiments in 

 the adult stage. The wing-pads start in the third stage. In the 

 nymphs of Enchenopa binotata there are five stages, before they grow 

 into the adult form. The nymph forms are shown in Figs. 8-12, the 

 adult in Fig. 13 greatly enlarged. The insect measures about 5.2 mm. 

 in the male, 7 mm. in the female. It takes 32 days for the full 

 development from the egg to the adult. I had the nymphs as 

 follows : 



Measurements 



of the Empty 



Shed Skins. 



Mm. 



In the first stage from May 14 to 21 ij^ 



In the second stage from May 20 to 25 2 



In the third stage from May 26 to 31 2^ 



In the fourth stage from June i to 14 3 



In the fifth stage from June 8 to 15 5 



The first adult to develop was a male. 



These insects, despite all their protective masses, suffer severely 

 from parasites ; Mr. Kornhauser says : " I have found a majority of 

 the Enchenopa binotata infested with a large internal parasite." I 



