T4 



from II. A. Ilagcn, and P. 11. Uliler have greatly assisted me iii 

 seeking information regarding tlie species. In only two localities 

 have I found the insect in Peoria and my attention was first 

 called to the subject througli the kindness of Col. D. P. Grier of 

 this city in December 1877. 



The Acer saccharimim, Hard Maple, is the only tree I have thus 

 far met the species on. Y. Signoret says: It is one of the com- 

 monest species in all the countries and is peculiar to the Maple, 

 although found on many other trees as the Elm, Linden and Chest- 

 nut. The scarcity of the insect in America and their abundance on 

 the few trees here, together with the short account of the life habits, 

 and the male not having heretofore been described, have all com- 

 bined to bring my attention to tlie insect with the following result. 

 Although the Embryology and Internal Anatomy have received con- 

 siderable attention, I will leave the description until a future time.*] 



THE EGG. 



The Qgg is regular and suljovate, the widest part near the 

 center, Fig. I. Tlie size varies, but is from 5 to 6 millimeters long 

 and 3 to 4 wide. When first deposited, the Qgg is of a light yellow 

 color, nearly cretaceous, but soon attains a dull, yellow brown, as the 

 embryo developes, as in Fig. II. From fourteen to twenty one days 

 are required for the development of the embryo, the condition of 

 the weather and the season of the year having much influence upon 

 the time. 



THE LARVA. 



Tlie young larva. Fig. Ill, is twice as long as wide, and is 

 from 7 to 8 mill, long and 3 to 4 mill. wide. The width increases 

 from the head, is broadest at the inesothorax, and decreases pos- 

 teriorly. The segments of the body are quite indistinct, the inden- 

 tures only defined after the body is boiled in turpentine or ,o % of 

 caustic potash and mounted in Canada Balsam. The entire number 

 of segments in the body are thirteen, one, or head, three thoracic 

 and nine abdominal segments. When first hatched, the insect is of 

 a uniform yellowish color, the sides are regular, and admit of a slight 

 compression at segmentations. The body is sparsely covered with 

 hairs ; several long and stout ones project from the head, as also 

 from the sides of thorax and abdomen, but from the last two seg- 



*] Since the above has gone to press I learn through Mr. Putnam of Davenport, 

 that Dr. S. S. llathvon of Lancaster, Pa., has found the Pseudococcus aceris on the 

 Hard Maple in that city, and from the specimens of the egg mass furnished I judge it 

 to be the same. 



