REPORT OF THE STATE ENTOMOLOGIST 1902 125 
House fly, Musca domestica: Linn. 
The bed bug, Acanthia lectularius Linn. 
The cockroach, Periplaneta orientalis Linn. 
The American cockroach, Periplaneta americana Linn. 
The croton bug, Phyllodromia germanica Fabr. 
1 
Beneficial species 
The general record concerning introduced species is not pleas- 
ant reading, but that of the forms which aid in subduing insect 
pests is one of the brightest pages of American economic 
entomology. The first prominent success met with in introduc- 
ing predaceous enemies was the importation of the Australian 
ladybug, Noviuscardinalis Mul., which was introduced in 
1889 in hopes that it would check the destructive fluted, scale, 
Icerya purchasi Mask., which then threatened the entire 
citrus industry of California. These hopes were realized in a 
most gratifying manner, and the ravages of that scale are now a 
matter of history. 
Another valuable importation is that of the fig insect, Blas- 
tophaga grossorum Grov., a species which is absolutely 
essential for the production of the best quality of figs, and its 
presence has made possible the growing of the celebrated Smyrna 
figs in California. This was accomplished largely through the 
division of entomology of the United States Department of 
Agriculture and is another of the signal triumphs of ap- 
plied or practical entomology. Another very recent importation, 
which may possibly prove of greatest practical benefit to American 
horticulture, is that of the -Chinese: ladybug, Chilocorus 
similis Rossi, a species which feeds readily on the San José 
scale and may eventually prove a very: efficient factor in controll- 
ing it. ' 
_A list of the more important beneficial insects which have 
become established in this country is as follows: 
A parasite of the fluted scale, Lestophonus iceryae. 
Will. 
The fig: insect, Blastophaga grossorum Groy. 
. Hessian fly parasite, Entedon epigonus Walk. 
‘Scutellista: cyanea Motsch., a: parasite of -the black 
. seale insect. = ; 
