SCALE INSECTS. 



15 



Fig. 4. — San Jos6 scale: c, adult female, 

 containing young — greatly enlarged ; 

 d, anal fringe of same — still more en- 

 larged. (After Howard and Marlatt, 

 Bui. No. 3, N. S., Div. Ent., Dept. Agr.) 



Descriptions of tlie San Jose Scale. ^ 



{Aspidiotus perniciosus Comstock.) 



The descriptions given by Howard and Marlatt are here- 

 with reproduced. 



Scale of Female. The scale of the female is circular, very 

 slightly raised centrally, and varies in diameter from 1 to 2 mm {^^^ 

 to i^OT inch, averaging about 1.4mm (j|s^inch). The exuvise is cen- 

 tral or nearly so. The large, well-developed scales are gray, except- 

 ing the central part covering the exuvise, which varies from pale to 

 reddish yellow, although in some cases dark colored. The scale is 

 usually smooth exteriorly or sometimes slightly annulated, and the 

 limits of the larval scale are always plainly marked. The natural 

 color of the scale is frequently obscured by the presence of the sooty 

 fungus {Fumago salicina). 



Scale of Male. The mature male scale is oblong oval, nearly 

 twice as long as wide, and averaging in length about half the diame- 

 ter of the female scale. The position of the larval scale is marked 



5 Bulletin No. 3, N. S., Div. Ent. 

 serted by the writer. 



Equivalents in inches are in- 



