376 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. IQ 



C. citricola was first observed on buckthorn growing in the immediate 

 vicinity of a citrus nursery. Since the buckthorn is a native plant, 

 growing in the mountains and in waste places in the valleys, it was 

 thought that the origin of the scale was accounted for. Upon further 

 exploration of different areas where buckthorn grows, it was found 

 that infestations of the scale on this plant did not occur at any great 

 distance from infested citrus trees. The scale was found most 

 abundantly on buckthorn growing in immediate proximity to citrus 

 trees. It has been found in scattering numbers on the same plant 

 growing in the washes from Claremont to Glendora. Specimens have 

 been taken on buckthorn in the San Dimas and San Gabriel canyons 

 two miles from citrus trees. It was not observed on buckthorn in the 

 vicinity of Santa Barbara or in Laurel Canyon near Hollywood, or 

 elsewhere. Further exploration of the buckthorn may result in a differ- 

 ent conclusion, but at present it appears that citricola went from the 

 citrus to the buckthorn instead of vice versa. 



The parasites that have been reared from both citricola and hes- 

 peridum include Coccophagus lecanii, C. lunulatus, and Aphycus luteolus. 

 Microterys flavus is a common parasite of hesperidum but thus far, 

 there appears to be no record of this species being reared from citricola. 

 Coccophagus flavoscutellum has been reared from citricola but not from 

 hesperidu7n. Timberlake^ records some other parasites and hyper- 

 parasites of hesperidum which have not been reared from citricola, but 

 less extensive studies have been made on the parasites of the latter 

 species. It is well known, however, that citricola is much less subject 

 to attack by parasites than hesperidum. 



At the South Carolina College and Station, two laboratories in charge of Mr. G. M. 

 Anderson have recently been established in the southern part of the state; one deals 

 with the boll weevil problem, and the other with the American mole cricket which is 

 developing into a serious pest, especially of truck crops, at some points along the 

 coast. Mr. J. A. Berly, research assistant, is in charge of the temperature-moisture 

 problem at the home laboratory, working in cooperation with the division of Southern 

 Field Crop Insects of the Bureau of Entomology. Professor W. A. Thomas has 

 about completed his work on the cotton root louse and at present is engaged in a 

 special study of the Aphidida) of South Carolina, with special reference to economic 

 control. The work of the Crop Pest Commission has developed satisfactorily during 

 the past year. An item of particular interest is the absolutely successful control of 

 three heavy infestations of the cottony cushion scale in Charleston by the introduction 

 of the Vedalia lady beetle, through the courtesy of the Plant Commissioner of Florida. 



^Timberlake, P. H. Preliminary report of the parasites of Coccus hesperidum in 

 Cahfornia, Jour. Econ. Ent. 6: 293-303, 1913; and Revision of the Genus A-phycus^ 

 Proc. N. S. N. M. 50: 561-640, 1916. 



