85 
of the usual form; front wings with three discoidal veins, the third 
twice forked; hind wings with two discoidal veins. The beak of mo¬ 
derate length. Usually found on leaves. 
There are some species included in this genus of which I have seen 
no specimens, it is possible therefore that a few may be wrong—but I 
think there very few such cases. In each case where there is doubt 
mention will be made of the fact. 
Aphis mali. Fabr. The Apple-tree Aphis. 
Fig. 15, 
Fig. 16. 
This, as its name indicates, is the common plant-louse, which is so fre¬ 
quently met with on the tender twigs and leaves 
of the apple-tree. It is more than probable that 
two or three different species are 
often counfounded under this 
common name; but practically 
this is of but little importance 
as the habits of the closely al¬ 
lied species are generally very 
similar, and the remedies to be used against 
them the same; still it is well for the horti¬ 
culturist to be able, if possible, to identify the different species which 
injure his trees. 
It is often quite difficult to determine whether the lice upon American 
plants are the same as the European species which occur on the same 
plants, as the descriptions by the early authors are very brief, and 
drawn up without proper examination and care; but a comparison of 
the Apple-louse of America with that of Europe, shows that they are 
identical, thereby making it evident that it has been imported into 
this country. But a change of locality has produced a slight change 
in the color, which for a time cast some doubt over this question. 
The following somewhat full description of this species will enable 
the reader to identify it with sufficient certainty. 
The wingless females of the summer brood are somewhat less than 
one-tenth of an inch long, of a pale greenish color, with the head 
usually more yellow than the body. Stripes of a deeper green are 
usually present on the back: sometimes there is but a single middle 
stripe," with partial transverse ones at the joints of the segments. 
Eyes, black; beak, antenna? and legs, whitish with dusky tips; honey 
tubes as long as from their base to the tips of the abdomen, dull 
whitish, with black tips. 
The winged males and females measure about one-eight of an inch 
to the tip of the closed wings; head and thorax black, the neck usu¬ 
ally green, abdomen a bright grass green, with a row of black dots 
each side, one dot on each segment; on the under side of the abdo¬ 
men, at the tip, are two square brown dots, and above, near the tip, 
often two or three dark transverse stripes. Antennae black, scarcely as 
long as the body; the two basal joints short and thick, almost as broad 
as long; third joint the longest of all, the sixth only about half as long as 
Note.— See No. II, figure 14. 8 The head and antenna;. 
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