THE MONTHLY BULLETIN. 343 



cyanide were used. Dr. Felt states that he tried contact sprays, but 

 obtained no results of value. 



Fumigation will undoubtedly prove to be satisfactory against this 

 pest on more extended experimentation, although hedges are rather 

 difficult to treat in this manner. 



THE ONTARIO MEALY BUG. 



( I'xciKlixiK-riis sji. ) 



Order — Hemiptera. Family — Coccidse. 



By E. O. EssiG, Dept. of Entomology, University of California. 



The mealy bug infesting the citrus orchards at Uplands and generally 

 known as the "Ontario ]\Iealy Bug" was at first believed to be Baker's 

 mealy bug, Fseudococcns hakcri Essig and was reported as such by the 

 writer in the report to tlie ^lealy Bug Convention held at Ontario, 

 California, January 30, 1914. Since that time the writer has given 

 as much attention as possible to this ])articular insect and is of the 

 opinion that it is not Baker's mealy bug^ at all, but either a new 

 species or an imported si)ecies from some other country. While the 

 general habits and appearance somewhat resemble those of P. hakeri, 

 -there are a numlx^r of characters Avhich are entirely different. The 

 wax tails or filaments are about the same length, but are much thicker 

 and form a sharper angle at the base than do those of P. hakeri. The 

 arrangement of the wax on the dorsum is also different and instead 

 of being quite evenly distributed and entirely covering the body there 

 are four distinct rows of small depressions which the wax does not hide. 

 These depressions cause corresponding ridges as shown in the illus- 

 tration (Fig. 72). The lateral filaments are also thicker than are 

 those of Baker's mealy bug. 



Another very significant fact which has induced the author to 

 believe this is an imported species was the recent finding of an 

 infestation of the same species on a shipment of bay trees (Laurus 

 nohilis) from Holland in a Japanese nursery at ]\relrose. Oakland, 

 California, April 12, 1915. This would indicate that it was imported 

 from Holland, inasmuch as none of the plants from Japan were 

 observed to be infested. 



Three species of mealy bug are recorded as attacking the laurel in 

 Europe: Pseudococcus adonidum (Linn.)-, P. i)ulicus (Sign.)^ and 

 P. laurinus (Bvd.).* Some entomologists are inclined to believe that 

 P. longispinus (Targ.) is distinct from P. adonidum (Linn.) and if 

 we are to .judge by external appearance P. adonidum as shown in a 

 photograph by Lindinger^ is certainly different from what we are 

 calling P. longispinus in this country. There is a bare possibility 

 that this might prove to be the California species at Ontario, but the 

 writer has no immediate means of settling this definitely. Pseudo- 

 coccus indicus (Sign.) is rej^orted as attacking Laurus indicus in 



'Injurious and Beneficial Insects of California, Second Edition, p. 126, 1915. 



=Lindinger, L., Die Scliildlause, p. 200, 1912. 



'Fernald, Mrs. M. E., Cat. Coccidae of tlie World, p. lO.S, 1903. 



*Fernald, Mrs. M. E., Cat. Coccida? of the World, p. 104, 1903. 



"Lindinger, L., Die Schildlaues, p. 8, 1912. 



