[47j Report of the State Entomologist. 143 



by them as two distinct species under the names of Lecanium acericola 

 and L. maclurce. 



Although marked differences have been pointed out in the several 

 forms named above, they are believed by those who have most closely 

 studied them, to be the same species with that first described by 

 Dr. Rathvon, and now known as Pulvinaria innumerabilis. 



Food-plants. 

 While a number of our scale insects appear to be either confined to 

 a single plant or limited to closely allied species, this scale insect, 

 from some peculiar adaptation to varied conditions, has quite an 

 extensive range, having been reported as found on maple, box-elder, 

 osage orange, linden, locust, svimach, beech, willow, grape, currant, 

 and rose. Possibly some of these may prove to be distinct forms. It 

 was found by me on the Virginia creeper, Ampelopsis quinquefolia, at 

 Tivoli, N. Y., on June 11th of the present year, the eggs giving out 

 their young five days thereafter. 



Life-history. 



The life-history of this and of other scale insects are full of interest, 

 but they can not be briefly given, and therefore those who desire to 

 become acquainted with them should refer to some of the many 

 papers in which they have been treated at length. This particular 

 species has been the subject of an elaborate paper of some fifty 

 pages and two plates, by the late J. Duncan Putnam, of the Daven- 

 port [Iowa] Academy of Natural Sciences, which, from the extremely 

 careful study of which it is the result, may justly serve as a model 

 for similar biological work. 



For the scientific study of the family, reference may be had to a 

 " Report on Scale Insects," by Professor J. H. Comstock, contained in 

 the Annual Report of the Commissioner of Agriculture, for the year 1880 

 (pp. 276-349, plates iii-xxii). A second report on the same insects, in 

 continuation of Professor Comstock's special study while Entomolo- 

 gist to the U. S. Department of Agriculture, is published in the 

 " Second Annual Report of the Cornell University Experiment Station." 

 It is devoted to one of the sub-families of the Goccidce, viz., the 

 Diaspince, and treats of 121 species, a number of which are for the 

 first time described. In addition to these, nearly fifty species of other 

 North American Goccidce are noticed. 



Remedies. 

 As the scale-insects when they abound are exceedingly injurious to 

 the vegetation that they attack, it is of great importance that all who 



