JULY 7, 1899.] 
from New York State without locality 
(Felt). 
Two localities in Ohio have furnished this 
scale insect, namely, Wooster, on plum, 
(F. M. Webster), and Cleveland, on pear 
(J. A. Stevens). One locality is repre- 
sented in Michigan, namely, South Haven, 
on apple, communicated by W. B. Barrows. 
In Canada the seale occurs on prune at 
Pocum, British Columbia (J. Fletcher), and 
on plum at Niagara, Ont. (Joseph Healey). 
A careful examination has been made of 
all material received at this department 
representing allied species or those with 
which there was any possibility of confu- 
sion with ostreeformis, with the result of the 
discovery of some half a dozen examples of 
the latter species. The material earliest 
received referable to ostreeformis bears date 
of January 12, 1895, and was communi- 
eated by Dr. Peter Collier, of the Agricul- 
tural Experiment Station at Geneva, N. Y. 
It was reported as occurring on plum near 
Rochester, and was identified at that time 
as ancylus, perhaps its nearest American 
ally. In the same year, April 3, 1895, 
specimens on plum were received for identi- 
fication from Mr. F. M. Webster, Wooster, 
O., and were also referred to ancylus. No 
additional material of this species was re- 
ceived until 1897; in that year Professor 
W. B. Barrows sent it from South Haven, 
Mich., and the insect was doubtfully iden- 
tified as ancylus. During 1898 it was re- 
ceived from several localities, as follows : 
Cleveland, O., on pear; Millbrook, N. Y., 
on pear; Geneva, N. Y., on plum; British 
Columbia, on prune, and Niagara, Ont., on 
plum. In 1899 it was received many times, 
principally from Geneva. N. Y., and also 
from Rochester and Penfield, as noted. Its 
origin on European stock is plainly indi- 
eated; possibly the original importation 
occurring about 1890, although perhaps 
earlier. 
The writer has made mounts and careful 
SCIENCE, 
19 
studies of this insect from various European 
localities,and has determined that Signoret’s 
species, Aspidiotus spurcatus, is a synonym of 
ostreeformis, and that A. zonatus Frauenf., 
is also probably a synonym, or, perhaps, a 
mere variety of the same species. 
The European localities from which the 
writer has examined specimens of this scale 
insect are as follows : 
Geisenheim, Germany, on apple, commu- 
nicated by Dr. L. Reh, Station fur Pflan- 
zenschutz, Hamburg; Isle of Langenau, 
Nackenheim, Rheinhessen, Germany, on 
pear sent by Dr. J. Ritzema Bos; Stettin, 
Prussia, on apple, collected by Mr. Theo. 
Pergande in July, 1898, ‘rather scarce’; 
Wanganingen, Holland, on pear, sent as 
probably perniciosus by Dr. J. Ritzema Bos ; 
Prague, Bohemia, on Prunus domestica, from 
Mr. K. Sule; Chester, England, on plum, 
communicated by Mr. Robert Newstead and 
labelled as determined by Mr. J. W. Doug- 
las; Florence, Italy, on Populus tremuloides, 
determined as Aspidiotus spurcatus (Cherm. 
It., Fase. I., No.3); Italy on Platanus orien- 
talis, determined as Aspidiotus spurcatus 
(Cherm. It., Fase. I., No. 5). On May 
19th also, of this year, this scale was found 
associated with a Mytilaspis sp., on cut- 
tings of date palm collected for the Depart- 
ment in Algeria by Mr. Walter T. Swingle. 
The species was originally described by 
Mr. Curtis from pear in England. Mr. J. 
W. Douglas reports it also in England on 
plum, pear, apple and cherry, and Mr. A. 
C. F. Morgan gives the additional food 
plant, Caluna vulgaris, in Portugal, finding 
it associated with Mytilaspis pomorwm. On 
the continent of Europe it has been vari- 
ously reported as affecting the fruit trees 
mentioned above. 
Aspidiotus zonatus was originally described 
from specimens found on oak in Vienna. 
The females occur for the most part on the 
bark ; the males on the leaves. It is widely 
distributed in Europe. The Department 
