120 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



the pest, if thoroughly done. 74 Crude oil emulsion, miseible oil sprays 

 and lime-sulphur (1-9), when the trees are dormant, are also recom- 

 mended. 



Fig. 101. — The European elm scale, Gossyparia ulmi 

 (Linn.), on the American elm. Adult females as they 

 appear in May and June. Natural size. (Original) 



Natural Enemies.— Dr. A. J. Cook reports the two-stabbed lady- 

 bird beetle (Chilocorns bivulnerus) as preying upon the European elm 

 scale at San Rafael. 



THE ARAUCARIA ERIOCOCCUS 

 Eriococcus aravcariw Maskell 



(Fig. 102) 



Description.— The female body is greenish-yellow with two promi- 

 nent anal lobes, each terminated with quite a long hair or spine. 

 The mature insect is enclosed in an oblong, white felt-like sac, as 

 shown in Fig. 102. The average length of the sac is about -^ inch. 



Life History. — The eggs are laid in the white egg-sac which en- 

 velops the female and the young escape and settle upon the brancnes 



7< Doten, S. B., Mo. Bui. Cal. Hort. Com., I, pp. 89-100, 1912. 



