72 
bine itself ceases to grow and falls from the pole, the lice continuing 
till they perish for want of food; and thus, without the intervention 
of a favorable change, the crop is destroyed, and the grower may of¬ 
ten consider himself fortunate if the plant recovers a due amount of 
vitality to produce a crop in the following year, for occasionally the 
hills are killed by the severity of the attack. This description of course 
applies to the most severe and unusual blights.” 
Although I give at the end of the list of this group of plant lice 
an account of the remedies for their destruction, it is proper to make 
the following statement here in reference to the remedies thought to 
be applicable to this species. 
Kirby recommends rubbing the leaves between the fingers, but even 
with the cheap labor in England this was found to be wholly im¬ 
practicable if ever attempted. Syringing, with this and other species, 
has been found ineffectual. Dr. Fitch thinks it is possible to contrive 
some method of confining tobacco smoke around the plants and thus 
destroy them. If this could be done, without too great expense— 
which is doubtful—it would be effectual. 
Buckton, the latest English authority on aphides, remarks as follows 
in reference to remedies for this species: “It is believed, however, 
that hitherto all plans and schemes practically have failed, and that 
the farmer will find henceforth his best policy to consist in the study 
of the economy of the aphis under notice, and in a furtherance, as 
far as may be in his power of the increase of some 6f the natural 
foes which prey upon it.” 
Phorodon humuli var mahaleb. Fonsc. 
Aphis mahaleb. Koch. 
Myzus mahaleb. Pass. 
Wingless viviparous female .—Length of body .11 inch. Length of 
antenme .07 inch, of honey tubes .03 inch. 
Rather larger than P. humuli; abdomen also broader. Figure long 
oval. Head and thorax, taken together, equal to only one-fifth of the 
length of the body. Color yellowish-green, wfith three darker green 
stripes on the back. Head narrow. Frontal tubercles porrected, but 
less so than in P. humuli. First antennal joint gibbous. Eyes red. 
Legs and antenme green. 
Winged vivipjarous female. —Expanse of wings .28 inch. Length 
of body .075 inch; of antennae .07 inch, of honey tubes .015 inch. 
Bright green, shining. Head, lobes of the thorax, antennae and 
legs, wfith the exception of the upper parts of the femora, black. 
Abdomen wfith several interrupted, dark, transverse bands, and three 
large spots on the carina. Two black spots under the insertions of 
the wings. First antennal joint gibbous. 
Common in May and June on the sloe, and also on the garden 
plum, under the leaves of which it forms considerable companies, 
though not so large, perhaps, as those of Aphis pruni. (From Buckton.) 
PHORODON SCROPHULARUE, n. 8p. 
This somewhat singular species was found by Miss Middleton, on 
Scrophularia nodosa; in the vicinity of Carbondale, Illinois, April 13, 
1878. 
