8 WM. n. EDWARDS. 



ment. All feed upon the same plants, elm, hop, nettle, ambrosia, and, 

 at the same time, the eggs and the young larvae of each species in 

 every stage of growth, may usually be found. But I have several times 

 noticed that the larvae of uniform size, or the eggs deposited on one or 

 two successive days on a particular plant, produced one species only. 

 For example, on the 7th of June, 1869, I found on the hop a number 

 of larvai from one day to one week old and several eggs. The latter 

 were about J^ of an inch in diameter, green, melon shaped, ribbed 

 vertically and depressed at either end ; gummed at one end to the leaf. 

 Under a glass the ribs were prominent — vitreous. As the eggs ma- 

 tured the color became a bottle green. They were fastened indiffer- 

 ently to any part of the leaf or stem, the only preference being for 

 young leaves. Frequently two or more were found one standing on 

 the end of the other, perpendicular to the leaf. Several times three 

 were so found, and, in one instance, four. After the larvae emerged 

 the ribs of the eggs resembled threads, the intervening colorless 

 membrane being broken. 



The larvae, at first, were black, j^^ inch long, covered with black 

 hairs and short spines. After first moult length j^^, color still black, 

 but one transverse set of spines, near each extremity, were reddish 

 yellow. With the next moult the color became black, striped longi- 

 tudinally with red, and with yellow streaks and dots at base of spines. 

 These last were in seven rows, many branching, red, or yellow red 

 tipped with black, except those on first two and last segments which 

 were wholly black ; this phase continued to maturity, although there 

 were variations in the color of the spines and in the relative preponder- 

 ance of black or red. Length, when mature, two inches. 



Between the 26th and 30th of June 23 of these larvae had produced 

 imagos, every one of which was of Interrogationia — 13 S 10 $ . 



From the 7th to 21st of August, T found many more eggs and many 

 larvae, and on the 21st was fortunate in seeing a female Liter rogationis 

 deposit an egg, from which, in due time, I obtained the imago. 



The larvae of i'^ai/vcu were, likewise, black at first moult; black, 

 with two bars of red and yellow spines at second, but thenceforth dis- 

 tinctly varied, becoming russet, or reddish specked with fine yellow 

 papillae, so much specked often as to make the general color rather 

 yellow brown, than red brown ; the spines sometimes whitish, sometimes 

 whitish at base and red at tips, with, in all cases, those at the extremi- 

 ties red. 



From these speckled larvae came ^ % \1 ^ Fahricii. From black 



