HOP APHIS. 
9 
Aphides from Elm, or Lime, or Willow, or Sycamore, may some¬ 
times be found on Hop ; they may even be seen for two or three days, 
and may produce young, but, as far as I can learn or have observed 
myself, these points are merely accidental, and no permanent lodg¬ 
ment is effected. In the course of the present season my own Hop 
plants were sprinkled with Aphides from neighbouring Elms, but these 
females produced young equally on the spiders’ webs as on the Hops, 
and all soon passed away. If the Hop Aphis is examined under a 
pretty strong magnifier it may be known by having tubercles on the 
forehead, with a tooth on their inner side; and also by the first (that 
is, the lowest) joints of each of the horns being bluntly toothed or 
gibbous. From this characteristic it takes its present generic name of 
Phorodon , signifying to bear a tooth ; and if we could find this Aphis 
on other trees (as we do on Plum), and as we apparently very likely 
might on the Nettle, this would be very important. 
In the course of June in the past season I received the following 
note regarding 
Hop Fly on Nettle. 
“ June 15th.—I may add that I found some of the same kind of Fly 
on Nettles close by our Hops. 
“ June 18th.—I send you some Aphides I have gathered from 
Nettles. I have examined the large green one, and it appears to me 
to be the same as the one figured in your Report (see p. 1, fig.). 
During the day it has given birth to two young ones. There is 
another with wings, but I think the others are not the Hop Louse.”— 
Arthur Ward, The Gardens, Stoke Edith Park, Hereford. 
I examined the females and young Aphides forwarded with great 
care, and could not find that they differed from the Hop Aphis and its 
young. They are certainly not the Nettle Aphis (Siphonophora TJrticce, 
Kalt.); and it will be observed that Mr. Ward notices seeing two kinds 
on the Nettle. 
It may have been an exceptional case, but still this matter well 
deserves searching into. The Nettle is so nearly allied to the Hop 
that it is likely enough on the face of the thing that the Hop Aphis 
should frequent it; and a remark is also given on this subject at 
page 3. If the Nettle is a host, as well as the Hop, of the Hop 
Aphis, it would account for borders of gardens being often first 
attacked, and in any case some experiment as to destroying Nettle 
beds, which may very likely be winter shelters, would do good. 
We do not yet know whether the female Hop Aphis lives through 
the winter, or whether, as may very likely be the case, she produces 
eggs in the autumn and dies,—this may vary according to the winter 
being mild or severe; but just as in the case of the Bean Aphis (which 
is one of this tribe), we know that, though there may have been no 
