Pec. xr, 1916 
Macrosiphum granarium 
469 
on distal two-thirds of fifth segment, and usual large sensoria at tip of sixth and seventh 
segments. Similar to winged viviparous female, but reddish to reddish brown, with 
black markings on either side of dorso-meson of abdominal segments, especially on the 
seventh segment where the marking converges on the meson. 
INTERMEDIATE FORM 
One individual was found that contained only eggs. Her hind tibiae 
were not swollen; nor did they have sensoria. The general color was the 
same as that of the oviparous female. It is not known whether she 
produced young previous to being mounted. 
EGG 
The egg is elliptical, 0.3 mm. in diameter .and 0.7 mm, long. It is a 
pale yellow when first deposited, changing in a few days through different 
shades of green to black. 
LIFE HISTORY AND HABITS 
Eggs begin to hatch during the last week in March in the latitude of La 
Fayette, Ind., and continue hatching through the first week in April. 
Eggs were obtained in Richmond, Ind., in the fall of 1908, but none 
hatched the following spring. Eggs were again secured in the fall of 
1909 at LaFayette, Ind., though only one hatched from this lot. The 
mortality of the eggs is very high, but no definite cause can be assigned 
for this at present. The eggs of this species were placed in hibernation 
under apparently the same conditions as those of several other species of 
Aphididae, the latter hatching readily and M. granarium hatching very 
sparingly or not at all. From hundreds of eggs secured in the fall of 
1910 only about 15 or 20 hatched. The eggs would remain plump 
until about time to hatch and would then shrivel. Eggs began hatching 
on March 24 in 1911. 
As is common with Aphididae in general in this latitude, this species 
at La Fayette, Ind., reproduces parthenogenetically until October, when 
the sexes appear and eggs are deposited. The writer took adult males 
in the field on bluegrass at La Fayette in November, 1909, and young 
males were observed on rye and volunteer oats on the Purdue Uni¬ 
versity farm in November, 1911. No oviparous females have been 
observed in the fields as yet, but the presence of the males indicates 
that the sexes occur normally on the small grains and on blue grass in 
the fall. 
Mr. R. A. Vickery, of the Bureau of Entomology, stated that he has 
taken the sexes on wheat in Minnesota, but he made no mention of having 
obtained eggs or stem mothers. Sanderson (13) reared adults of both 
sexes indoors in Texas in 1903, although he made no record relative to 
the egg. It is doubtful whether eggs occur normally that far south. 
