234 Journal New York Entomological Society, t^^o'- xxviii, 



larva, others were put into a bottle. In both groups, eggs began to 

 hatch on the gth about 9 A.M. The egg period is therefore about 

 two days. 



The cecropia did not eat after the 8th and began to decrease in 

 size. It died on the 13th, finally turning black. 



Full grown larvae were seen emerging on the 25th and kept on 

 emerging during the 26th and 27th. On the evening of the 28th, 

 four large larvae could be seen in the remains together with numer- 

 ous small larvae, these latter perhaps belonging to another species. 

 Some of the large larvae formed pupae from which the adults failed 

 to emerge. Coll. Amer. Mus. Nat. Hist. 



Tropaea luna (Linne). 



One nearly full grown larva was found on hickory, September 23, 

 1916, at Pearl River, Rockland Co., N. Y. On April 9, 1917, a rather 

 undersized female of the normal form emerged, not spring form 

 rubrornarginata Davis. Mr. Davis suggests that the above is due to 

 the pupa having been kept in the house, i.e., under artificial condi- 

 tions. The cocoon was, however, kept in a wire breeding-cage and 

 in a very cold room. Coll. Amer. Mus. Nat. Hist. 



Macronoctua onusta Grote. 



In June, 1917, we received at the Museum, several young larvae 

 and their workings in cultivated Iris. These were collected by Mr. 

 R. G. Van Name in his garden at New Haven, Conn., where they are 

 very destructive to his Iris. Early in September, Mr. Van Name dug 

 up several pupae from his Iris bed and sent them to us. One imago 

 emerged on September 20 and three on September 21. Coll. Amer. 

 Mus. Nat. Hist. 



Phobetron pithecium (Smith and Abbot). 



On the afternoon of Sepetmber 2t„ 1916, one nearly full-grown 

 larva was collected on white oak at Pearl River, Rockland Co., N. Y. 

 A twig of the oak with the larva was placed in a satchel as I had no 

 receptacle for larvae with me. A twig of hickory with a larva of 

 Tropcca luna (Linne) was then placed on top of the oak. About one 

 hour later I looked into the satchel to see how the larvae were getting 

 along and found that the pithecium had, of its own accord, left the 



