322 
Journal of Agricultural Research 
Vol. VH, No. 7 
discussion of that species. No complete description was given but enough 
was recorded to leave no doubt that he had our well-known rosy aphis. 
The fact that he referred to the winged form as almost entirely black is 
given by Gillette as sufficient evidence for rejecting the name as not 
applicable to the insect herein considered. It must be remembered, 
however, that the insects to which he referred were fall migrants (taken 
on October 4). These fall migrants are usually much darker than the 
spring migrants and the writers have reared many at Vienna, Va., which 
were a uniform jet-black. There seems very good reason, then, for 
accepting Fitch’s name as referring to the species, and since A. sorbi 
and A. pyri prove to be distinct, A. malifoliae Fitch is the name that 
■ must stand for the species. 
Aphis pyri Boyer de Fonscolombe, r84i.—This name (r) is the earliest 
one that has been applied to our rosy aphis. Gillette and Taylor (7, 
p. 31-32) referred the species to it when they found themselves unable 
to accept A. sorbi Kalt. The original description, however, will not fit 
our insect, and, although later descriptions given under this name might 
do so, it will for this reason be impossible to use the name for our common 
rosy aphis. It may be that Gillette and Taylor based their identification 
upon the description referred to Boyer’s species by Koch (3). 
In redescribing what he thought to be the A. crataegii of Kaltenbach (2) 
as well as the A. pyri of Boyer, Koch based his descriptions entirely 
upon apple forms. In this he was describing the forms doubtfully 
referred to A. crataegii by Kaltenbach, but seemingly not the true 
A. crataegii of that author. The description given agrees very closely 
with our apple insect. It would seem, therefore, that the descriptions 
of A. crataegii Kalt. and A. pyri Boyer refer to another insect, but the 
A. pyri Boyer of Koch (3, p. 108-110, fig. 145, 146) is the A. malifoliae 
of Fitch. This insect, however, must be distinguished from the A. pyri 
of Koch (3, p. 60), which is quite a distinct species and has been renamed 
.4, kochii by Schouteden. 
Aphis crataegii Kaltenbach, 1843.—Kaltenbach (2, p. 66-67) described 
a species under this name from the white thorn. The description as 
given does not agree with specimens of the insects under consideration. 
It seems evident, then, that this name can not be applied to the rosy 
aphis. In his description, however, Kaltenbach refers to specimens 
taken on apple which he believed might be the same as those on thorn. 
It seems to the writers that these forms are the same as ours upon apple 
and that Kaltenbach was in error in considering them to be the same 
species as his specimens on thorn. This is indicated by his comparison 
between the two. 
Aphis sorbi Kaltenbach, 1843—This species (PI. 20, A) was described 
(2, p. 70-71) from specimens on Sorbus. This is the name now most 
uniformly applied to the rosy apple aphis in this country. The first 
