237 



probability that the insect is much more widely distributed than 

 the records indicate, and that it has not been more often recorded on 

 account of its strong resemblance to the cottony maple scale. Almost 

 any observer, no matter how familiar he might be with scale-insects, 

 would mistake the species without cai-eful examination. It must be 

 stated furtlier that in her paper, Miss Smith wrote that she had learned 

 through J. 1). rutnam, of Davenport, Iowa, that Dr. S. S. Rathvon, of 

 Lancaster, Pa., had found the species upon hard maple in that city. 

 An egg-mass was furnished to Miss Smith, and she judged it to be the 

 same. This record, however, is not a positive one as Miss Smith does 

 not seem to have seen the insect itself. 



In view of this apparent increase of the species, it will be well to 

 review in brief its life history, especially as Miss Smith's paper is diffi- 

 cult to consult. The different stages of the insect have been carefully 

 tigured, and will give a better idea of its appearance than any descrip- 

 tion. 



Fig. 2i.—PsciaIococciis aceris: a, adult female; b, anteiiua of same; c, adult male; d, joung larva; 

 ('. antenna of same — a, c. d, greatly enlarged; b, e, still more enlarged (original). 



The insect, as it occurs upon the leaves in summer, appears as au 

 oval mass of powdery, slightly stringy, white wax about a quarter of 

 an inch long and a littleless in width (Fig. 23 a). This masf»contains the 

 body of the adult female and her eggs. The female herself occupies 

 the anterior end of the mass and her body constitutes about one-fourth 

 of its bulk (Fig. 24 a). She is light yellow in color, about 5""" long by ;>""" 

 in diameter; the upper surface of the body is covered with numerous 

 spinnerets, which are more dense at the posterior extremity, and inter- 

 spersed with short spines which are somewhat longer at the posterior 

 end. The antennre are 9-jointed (Fig. 24 i), joint 9 longest, joints 3-5 



