HEMIFTERA. I$I 



2 . This also infests oranges; but its injuries are overshadowed in 

 Florida by those of other scale-insects; ./. ncrii (Fig. 120) is the 

 common white scale, which occurs on a great variety of plants. It 

 is an imported insect ; but I have collected it throughout our country 

 from the Great Lakes to the Gulf of Mexico, and from the Atlantic 

 the Pacific; in the colder parts of the United States it is, next to 

 the mealy-bugs and Lecanium, the most common Coccid on house- 

 plants. In northern California, and especially in the Santa Clara 

 Valley, is found A. pcrniiii>sns; this is a circular, grayish scale which 

 infect- nearly all of the deciduous fruit-trees grown in that State. It 

 is the nmst destructive of the scale-making Coccids; and before the 

 fruit-growers auoke to the importance of fighting it, it came near 



roving the orchards of that section. 



x/vx. Our commonest representative of this genus is Dnisj>is 



i Plate VIII. 11; this is a snowy-white scale, which occurs 



abundantly on neglected roses; I have found it also on raspberry, 



and blackberry bushes. Didspis carudi (Plate VIII. 2) is common 



in some localities on Juniper and allied plants. 



Chionaspis. The common white scale of pear and apple is C/ii- 



muupis f&rfurus (Plate IX. i). Another common species which 



occurs throughout the United States upon the leaves of pine and 



spruce is C. pimfolii (Plate IX. j .. C. cudnymi (Plate VIII. 3) in- 



inus ; it is remarkable for having the scale of the female 



dirty blackish-brown color, instead of white-, as is the rule in this 

 genus. The common white scale of willow is ( '. sdf/ds. 



Myti/tispis.'liO this genus belong some of the best known Coc- 



. ( )f those that occur on plants in the open air, only three 

 American species have been recogni/ed. Two of these abound on 



iges. One of the orange species .17. ^/<>:-<n;. , Plate \ i he 



ly recogni/.ed by the very narrow form of the scale-, and the I 



that laid in two rows beneath the scale (Plate X. I 



In the other </d, ( Plate X. I . i the scale of the 



ich wider, and the - irregularly beneath 



hell Bark-louse of the Apple. .)/. /v ;//<>;///;/, 



is (1 fmm M. citricola <.nly by minute eh.n, The 



to would set lly well for this 



that it does not oeeur <>n t; the nx.st common 



the t "nit. d State I in \\ Inch that ' 



! "th, r plants 



'ants ..t in ,1 on Plat. VII.. and not 



ida 



