17 



the true Pulvinaria innumerabilis, that its validity as a species was 

 established. Although Walsh and Riley submitted no description, the 

 figure is so characteristic as, under the accepted rules of zoological 

 nomenclature, to carry the name. 



The same insect is said by Walsh and Riley to occur at Davenport, 

 Iowa, on the authority of Mr. Tiffany; and it has been received at this 

 office from Prof. Hunter Nicholson, of Knoxville, Tenn., Mr. R. H. 

 Pettit, of Michigan Agricultural College, who found it at Ithaca, N. T., 

 and from Mr. E. R. Malone, who found it abundant and injurious at 



Fig. 11.— Pulvinaria acericola: a, egg; b, newly-hatched larva; c, antenna of same; d, female larva, 

 early spring condition, from below; /, full-grown male larva; g, adult male: h, tarsus of same— all 

 gr- .vly enlarged; c and h still more enlarged (original). 



Dou an, Ala. The writer also has been told by Dr. J. B. Smith that 

 it occurs at New Brunswick, N. J. It also has been found in the east- 

 ern section of the city of Washington, D. C, by Mr. Busck, of this 

 office. The species, therefore, has rather a wide range in the United 

 States. 



Food plants.— The only tree upon which the species has so far been 



foui I is the common silver-leaf maple, now known as Acer saccharinum. 



For purposes of study the insect was colonized iu June, 1898, on some 



fori pi maples on the grounds of the Department of Agriculture, Acer 



11608— No. 22—2 



