53 



Collins and Denver. Like C. ahieMs, these also deposit their eggs in 

 clusters, each eg^ being anchored b}^ means of one or more waxy 

 threads, and covered with a white waxy secretion from the abdomen 

 of the female. These lice are ver}^ small, not exceeding a millimeter 

 in length. They are dark in color and are all Avingiess 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 entirety ovi- 

 parous. The newly hatched lice arrange themselves in rows along the 

 leaves, and when the white secretion is well formed thej 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 ver}^ largely between the X3airs 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 gi-ain louse {Nectaropliora 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 vihernum) 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 {Pempliigus 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. Tlie 

 eggs blacken the twigs of apple trees in the fall so that they are 

 noticed during winter hj 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 



