526 



THE MONTHLY BULLETIN. 



Paula, we have been able to colonize thoroughly this species in those 

 portions of the State where the citrus mealy bug is al)undant. To date 

 we have colonized approximately 40,000 individuals, the colonies vary- 

 ing in size from one thousand to ten thousand each. The localities are 

 as follows: Sierra Madre, Upland, Alhambra, Monrovia, San Gabriel 

 Valley, Fresno, Marysville, Riverside, San Diego County, Sweetwater 

 Valley, San Francisco, San ]\Iateo County, Santa Paula, and Sacra- 

 mento. Small colonies were also furnished to Professor Watson of the 

 Florida Experiment Station at Gainesville, Fla., and to Mr. Ehrhorn of 

 the Board of Agriculture and Forestry, Honolulu, Hawaii. During 

 the next season it is proposed to increase the distribution of these para- 

 sites very greatly. 



In the colonization of this parasite we have been materially assisted 

 by the United States Bureau of Entomology, and this assistance is here 

 gratefully acknowledged. During the latter portion of the summer it 

 was deemed desirable to establish a temporary substation in the south, 

 where the more important colonies were liberated. This was decided 



Fig. 108. — Adult of Paraleptomastix abnormis. Greatly- 

 enlarged. (Author's Illustration, Mo. Bui., Cal. Hort. 

 Com., Vol. IV, No. 4.) 



upon to avoid the necessity of shipping by mail these parasites, which 

 are quite delicate, and also to enable us to handle the field end of the 

 work in a more intelligent way. To Mr. E. J. Branigan was entrusted 

 the work of placing the southern colonies and of following their 

 progress in the field. He was given ample quarters in the laboratory 

 of the Bureau of Entomology, 150 South Holliston avenue, Pasadena, 

 and every facility placed at his disposal. The results of the field 

 investigations were very gratifying, the parasites having been found 

 breeding under natural conditions in the field. I transcribe herewith 

 some of Mr. Branigan 's field notes : 



"Alhambra, July 29. 1915. — Found adults of Paraleptomastix abnor- 

 mis present on several different trees. On one tree, looking up through 

 the branches from the underside, counted nine adults on one twig, two 

 leaves with three each, several leaves with one each, also several mealy 

 bugs with exit holes." 



