53 
Collinsand Denver. Like C. abietis, these also deposit their eggs in 
clusters, each egg being anchored by means of one or more waxy 
threads, and covered with a white waxy secretion from the abdomen 
of the female. These lice are very small, not exceeding a millimeter 
in length. They are dark in color and are all wingless early in the 
season. Early in June winged individuals appear. These winged 
females have less of the waxy secretion with which to cover the clus- 
ters of eggs that they lay upon the leaves, and so they cover them with 
their enormously large wings. Both species seem to be entirely ovi- 
parous. The newly hatched lice arrange themselves in rows along the 
leaves, and when the white secretion is well formed they are com- 
pletely covered by it. The species infesting the pine is specially 
numerous at the new growth at the tips of the twigs, and the little lice 
winter very largely between the pairs of needles that grow together 
and near their base. 
Both lice and eggs are readily killed by the use of kerosene emul- 
sion or whale-oil soap. (Photographs were shown illustrating these 
lice. ) 
PLANT-LICE. 
The grain louse (Necta rophora granaria) did considerable damage 
in eastern Colorado last year. I know no previous record of its 
occurrence in this State. This year it has occasioned no complaint, 
and I have no knowledge of its occurrence. 
Last year Mr. Ball investigated the injuries of this louse along the 
line of the Santa Fe Railroad in the State and found wheat, oats, and 
barley attacked, but the chief injury was to wheat. 
The snowball plant-louse (Aphis vibernum) is a comparative recent 
acquisition in the northern portion of the State. For the past two 
years it has been rather abundant upon snowball bushes upon the 
campus of the State Agricultural College at Fort Collins. 
The ash gall louse (Pemphigus fraxinifolia) continues to be one of 
the worst pests that our ash shade trees have to contend with on the 
plains of the eastern slope in the State. It is not destructive to the 
trees, but seriously mars their beauty, and the secretions that fall 
from the lice are annoying, to say the least, to those who would enjoy. 
the shade of one of our best lawn trees. 
The apple louse (Aphis mali) has become one of the most common 
of our plant lice within the State, occurring upon both slopes. The 
eges blacken the twigs of apple trees in the fall so that they are 
noticed during winter by the owners of orchards, who send them to 
the Entomologist for identification. The strange thing about these 
eggs is that we have not been able to find any lice hatching from them 
upon trees where they are deposited, and twigs have been brought into 
the laboratory bearing thousands of eggs of this louse; but we have 
not succeeded in getting any to hatch. It does not seem that it could 
