A I^EW ORCHARD PDANT RICE 31 
EIRE HISTORY 
The lice that first appear in the spring, the stem-mothers, 
hatch quite early, before the buds begin to open at all, from little 
shining black eggs that were deposited upon the bark of the twigs 
the preceding fall as in case of the common apple aphis. These 
stem-mothers are fully as forward as those of the clover aphis. 
They were mature and depositing young of the second generation 
in the orchards about Delta as early as April 14th this year. 
The stem-mothers are rather deep green in general color with 
the head and tail ends of the body lightest in color, and the green 
may or m.ay not take the form of lighter and darker transverse 
stripes. They do not acquire wings. 
These first lice give birth to young for two or three weeks, or 
somewhat longer, and then die. Some of these second generation 
lice get wings and leave the trees. What lice are left produce a 
, third generation which more largely become winged and leave, 
according to Pergande, to go upon certain grasses, especially oats, 
wheat, barley, and rye, where they continue to increase in numbers 
until late in the summer or early in the fall, and the winged 
migrants leave the grains and grasses again and return to the 
trees. Here they probably give birth to the true males and females, 
the latter of which deposit the eggs to remain over winter and 
hatch the stem-mothers to start the complex round of development 
for another year. ,(We have not yet traced the fall stages, nor have 
we been able to colonize it upon the grasses from the apple.) 
We have not prepared technical drawings for this louse* * 
THE ROSY APPLE APHIS* 
{Aphis pyri Boyer.) 
A rosy tinted aphis of doubtful determination appeared in con- 
* For illustrations 'Of this louse see Pergande’s figures, Bull. 44, Bureau 
of Ent.; also Sanderson’s 13th Rep. Del. Exp. Sta., p. 13 9. 
* This seems undoubtedly to be the louse that Sanderson described and 
figured in the 13th Annual Report of the Delaware Experiment Station 
(1901), as Aphis sorbi. Quaintance, Circular 81, Bureau of Entomology 
0907), considers this to be Aphis malifolii Fitch, but Fitch describes this 
louse as being “of a shining black color throughout,” and also states that 
“the legs are entirely black.” None of the lice we have taken fill these 
requirements. Specimens of Aphis sorhi from Europe sent by Dr. Cholod- 
kovsky and taken by him from Sorhus aucuparia, the original food plant 
of this species, fit well into Kalitenbach’s description!, and are doubtless 
that species. While the Colorado material possesses the four dorsal spines 
in front of the cauda and has the general color markings of sorbi, the 
dorsal tubercles are smaller and the lateral tubercles of the abdomen and 
thorax are much weaker. The larvae and pupae senitl by Dr. Cholodkovsky 
have the cornicles unusually large and strongly tapering, while in our mate¬ 
rial the cornlicles are not excessive in size. On the whole, our Colorado 
louse seems more nearly to correspond to the descriptions and figures of 
Aphis pyri Boyer, as given by Koch, and also by Bucktoo, and these de¬ 
scriptions and figures seem also to correspond very well with the cliaracteri- 
