121 
kind externally visible, though the eggs under the scale were par¬ 
tially enveloped in a delicate white floss, At figure — we also 
give a view of another new species of this same genus with similar 
cottony matter at its tail ( Lecanium acericola) which infests the bark 
and the leaves of the common maple. It was received by us June 
26, 1867, from Mr. B. N. McLain, of Indiana, and in a few weeks after¬ 
wards the young bark-lice commenced hatching out from the cottony 
matter. We have also received the same bark-louse from Mr. Tiffany, 
of Davenport, Iowa, who found them on his soft maples. 
“None of the species belonging to this particular genus of bark-lice, 
Lecanium , have ever been known to swarm for any length of time in 
such numbers as to become permanently injurious to the plant upon 
which they feed.” 
The bark-lice have been so little studied that formerly a new name 
was given for each kind found on different species of plants, and in 
this way there have undoubtedly been many species described as new 
which more careful study and investigation will prove to be varie¬ 
ties of the same. In the two species Lecanium acericola and L. maclu¬ 
rx every effort has been made to obtain specimens of the maclurx , but 
without success, and it is very probable the maclurx as found on the 
Osage orange by Walsh and Riley, is the same as found on the soft 
maple. Nothing more has been recorded in reference to it, and the 
above is not sufficient to give specific difference. 
In an article on Homoptera by Townsend Glover recently printed 
in the Smithsonian report, 1876, page 44, he speaks of the Lecanium 
acericorticis , Fitch, 1859, page 776, as occurring on the silver maple in 
the Smithsonian grounds in Washington and other maples in the 
neighborhood, and says the Lecanium acericola and Lecanium maclurx 
are probably varieties of these. This can only be ascertained, how¬ 
ever, by breeding the L. acericorticis in its various stages, together with 
the male, and comparing with the others. Since 1867 the maple trees 
have continued to harbor these small insects until the past two years. 
I have found them in various parts of the State, the trees in Peoria 
being at the present time more seriously affected than at any previ¬ 
ous period, although the insects have been on a steady increase for 
several years. 
The presence of myriads of these bark-lice upon the maple trees, 
each one sustained by the sap of the tree, can have no other effect 
upon them than that of serious injury. Their presence is recognized 
a distance off by the unhealthy and wilted appearance of the tree. 
Mr. .J. Duncan Putnam, Davenport, Iowa, has given caieful atten¬ 
tion to the develonment of this insect, and from his notes which he 
has generously placed at my disposal, I am enabled to substantiate 
my own observations with more certainty. I am also indebted to him 
for the loan of mounted slides of the male from which Mr. Emerton 
has drawn the illustration. 
The season is advanced a few days in Peoria over that of Daven¬ 
port, and therefore the different stages of insects are developed a few 
days in advance in Peoria when I made my notes. 
I am not aware of anything further having been recorded respect¬ 
ing the life habits of the Lecanium acericola since the above quoted 
article by Walsh and Riley in 1867. A few newspaper accounts, with 
