PUTNAM ON PULVINAKIA INNUMERABILTS. 295 



writes to me that he "called it Coccus aceris merely from supposition 

 that it was this species, because it infested the maple."* 



In the nuQiber of the Practical Entomologist for October 30th. 1865, 

 (Vol. I, p. 6) mention is made of a supposed new species of Lecaninm 

 found " upon a branch of Sugar Maple at Fort Wayne. Indiana," which 

 probably refers to the species under consideration. 



In the number of the Practical Entomologist for August and Septem- 

 ber, 1867, (Vol. II, p. 119) mention is made of a bark-louse on the leaves 

 of the common maple, received from B. W. McLain, Indiana. These 

 same specimens are afterwards (in American Entomologist] mentioned 

 as types of Lecanium acericola. 



In the Aynerican Entomologist for September, 1868, this species is 

 figured and named Lecanium acericola by Messrs. Walsh and Riley, 

 from the above mentioned specimens received from Indiana, and others 

 from Mr. A. S. Tiffany, of this city. The figure represents two females 

 witli their egg nests on the leaf of about half the usual size, and the only 

 hint at a description is, that it has " similar cottony matter at its tail/' 

 and is " light-brown and white " in color. Although the description Is 

 defective there is traditional knowledge sufficient to fix the identity of 

 this species with that which 1 have studied, in the fact that the speci- 

 mens sent by Mr. Tiffany to Mr. Walsh in 1868, were taken from the 

 same trees on which my first studies were made in 1871 ; by numerous 

 determinations made by Mr. Riley himself, and by an examination of 

 specimens contained in his collection. This figure and name have been 

 copied by Dr. A. S. Packard, Jr., in his '' Guide to the Study of Insects,''^ 

 (2d ed., p. ,528, fig. 530a,) and in his " Half hours with Insects, (p. 112, fig. 

 77a) but without any additional information. 



In the Lancaster Farmer for July 15th, 1876 (Vol. A^III, p. 101) Dr. 

 Rathvon published another article on this insect, this time calling it 

 Lecanium acerella. This paper is mainly a resume of the previous one, 

 but with the addition of a brief mention of the males, and a statement 

 that the leaves as well as the twigs were infested. Regarding this paper. 

 Dr. Rathvon writes to me as follows : 



■' The paper in the Lancaster Farmer for July, 1876, relates to the same insect, so far as 

 Jiij' observations extended, for my remarks there are in reply to a correspondent whose trees 

 were infested, I nevertheless have all along been impressed with the belief that there are 

 two species fonntl on the maple trees; but, other occupations have always prevented their 

 investigation. My reasons for thinking so, are mainly these. While they were at their very 

 worst, on the linden, the maple, and the grape, I never noticed any of them on the leaves, 

 they were entirely confined to the undersides of the brunches, and especially the twigs which 

 were entirely covered at the period of incubation, and the leaves were dwarfed, turned yel- 

 lowish, and many of them fell off. Some years, however, after the publication ot the paper in 

 the Farm Journal, I noticed them, or another species, both on the branches and the leaves 

 of the silver maple, (there being then few linden trees left) but they differed somewhat in form 

 those described in my paper alluded to. They were not ,so large, the secreted cotton mass 

 was somewhat depressed, faintly bilobed, and transversely undulated or indented; in some 

 very irregular, but in others almost as regular and distinct as the articulations ofaTri- 

 k)bite." 



* I am under obligations to Dr. Leidy for a copy of his Report, and for a number of speci- 

 mens from Philadelphia for comparison, whit;h are not specifically different from those found 

 Sn this locality. 



