126 NEW YORK STATE MUSEUM 
Cardinal ladybug, Novius cardinalis Muls. 
Australian ladybugs, Novius koebelei Olliff and N. 
bellus Blackburn. 
Chinese ladybug, Chilocorus similis Rossi. 
Black ladybug, Rhizobius ventralis Erich. 
A predaceous enemy of bark borers, Clerus formicarius 
Linn., introduced from Europe in 1892 by Dr A. D. Hopkins as a 
valuable predaceous enemy of certain very injurious bark borers. 
European praying mantis, Mantis religiosa Linn. 
Chinese praying mantis, Tenodera sinensis Sauss. 
The two latter were accidentally brought into the country ; and, 
while we expect that in the main they will be beneficial, appre- 
hension is felt by some, and their introduction may not prove 
to be an unqualified benefit. 
EXPERIMENTAL WORK AGAINST SAN JOSE SCALE 
INSECT 
The experimental work against this insect begun in 1900 and 
continued in 1901 was further prosecuted during the past season, 
and the results of earlier years were largely confirmed. 
The lime, salt and sulfur ‘mixture, about which considerable 
has been written in the past 12 months, was also tested, and 
some valuable data obtained under various conditions. The 
results in earlier years from spring applications of whale oil soap 
in combination with crude petroleum and kerosene or its emul- 
sions were such that it was not deemed advisable to continue 
further work with these substances. The combination of the 
soap with petroleum reduced the insecticidal value of the latter 
and made a. somewhat safer combination, but increased the 
cost of the emulsion, so that its use can be advised only when 
no mechanical emulsion apparatus is at hand. The kerosene 
and its emulsions proved so unsatisfactory in early spring appli- 
cations that no further work was attempted with it. 
Fall applications 
All our previous work had been done in early spring just 
before the buds began to open or just as they were unfolding, 
and though the results were exceedingly satisfactory some tests 
with fall applications were planned. These were all made Dee. 
