126 NEW YORK STATE MUSEUM 



Cardinal ladybug, Novius cardinalis Muls. 



Australian ladybugs, Novius koebelei Olliff and N. 

 b e 1 1 u s Blackburn. 



Chinese ladybug, Chilocorus similis Kossi. 



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 JOSfi 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 v 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 Dec. 



