660 EXPERIMENT STATION RECORD. [Vol.43 



sectaries (pp. 146-149), buildings and equipment (pp. 150-155), and demon- 

 stration worl<: (pp. 15G-15S). Tlie posts considered are the citrus mealybug 

 (Pseudococcus citri), citrophilus mealybug {P. gahani), Baker mealybug {P. 

 maritimus {hakcri), and the Japanese mealybug (P. krauhniw Kuwana). 

 Their natural enemies of particular importance are the lady bird beetle Crypto- 

 lamus montrouzieri and the Sicilian parasite Tanaomastix abnormis Gir. 

 ■ Of the four species of mealybug, P. citri has been the longest established 

 within the State and seems particularly adapted to the coastal regions, though 

 it has been found to thrive exceedingly well at certain seasons of the year 

 in the hotter interior valleys. P. gahani has spread quite extensively since 

 its original infestation at Uplands, San Bernardino County, in 1914, and is 

 now found quite widespread near Riverside, Riverside County ; in Pasadena, 

 South Pasadena, Alhambra, and the city of Los Angeles in Los Angeles County ; 

 and has been reported from Fillmore in Ventura County. It is thought that 

 due to the fact that it has only one main generation it can not become quite 

 so serious as the citrus mealybug, which lias two or more definite generations. 



P. maritimus has been found throughout the southern part of the State 

 since 1898, at which time it occurred quite generally on citrus in Orange County, 

 and has since been taken on citrus in nearly every county in the south. It has 

 seldom reached a stage where it has been necessary to consider control, having 

 for the most part been suppressed by native natural enemies. P. krauhniw, 

 which occurs in the Ojai Valley in Ventura County, and was for a number of 

 years considered to be the citrus mealybug, was discovered in 1918 to be the 

 Japanese mealybug. 



The Lecania of Michigan, R. H. Pettit and E. McDaniel {Michigan Sta. 

 Tech. Bui. 4S (1020), pp. 35, figs. 23).— Thirteen species and one variety are 

 described, of which Lecanlum (Toumeyella) numismaticum from Scotch pine 

 and L. (ToumeyeUa) corr-ugatum neglect uni from pitch pine are described as 

 new. 



It is pointed out that the only characters apparently thus far discovered for 

 separating the forms of Lecanium into species lack stability, and this accounts 

 for the multitude of species recorded. Forms of wliat the authors considered 

 L. corni are distributed over a multitude of host plants and seem to thrive 

 under various climatic conditions. They vary in size, shape, color, and some- 

 what in derm markings, characters of the anal plates, and in the antennal char- 

 acters, and the appearance of the derm seems to be influenced strongly I\v the 

 age of the subject, by the method of its preparation, and by the time of boiling. 

 The preparation of a key has been deferred imtil a later date. 



A new Myzocallis (Aphididii?: Homoptera) , W. M. Davidson (Cauad. Eiit., 

 52 {1920), No. 8, pp. 116, 177, fig. 1).—j\[. alhamhra taken from Quercus engle- 

 manni at Alhambra, Cal., in 1919 is described as new. 



Some poultry lice and mites found in Colorado, C. G. Babcock {Colo. Agr. 

 Col. Ext. Bui., 1. set:, No. 165A, {1920), pp. 3-U, figs. 4).— This is a popular 

 account. 



Dusting and the spray gun in calyx worm control, L. Childs {Better 

 Fruit, 14 {1920), No. 10, pp. 7, 8, 38, figs. 2). — This report is based upon investi- 

 gations made by tlie entomologist of the Hood River Experiment Station. 



The European corn borer again, R. H. Pettit {Michigan Sta. Quart. Bui., 

 2 {1920), No. Jf, p. 183). — This note calls attention to the fact that shipment of 

 broom-corn stock from abroad and from infested regions is a prolific source of 

 infestation of the European corn borer. It has been found that broom corn 

 from Europe has been shipped to several localities in Michigan, and it is 



