252 STATE BOARD OF HORTICULTURE. 



Adult female, 3 mm. to 4 mm. long; yellow, inclined to brown 

 upon disk, shape elongate-oval, nearly fiat, smooth and shin- 

 ing. Antennas seven-jointed, legs slender and long. Young 

 larva oval, long. Viviparous. 



This species is not a serious pest and is easily subdued. 

 There are several parasites that keep it in check, so much so 

 as to prevent its doing material injury. 



Treatment. — Rosin solution (formula No. 1), and kerosene 

 emulsion (formula No. 3). 



(3) Hemispherical Scale. 



A dark brown, hemispherical scale; infests citrus trees prin- 

 cipally — the lime the most. The scale settle on the limb and 

 on the leaf, mostly on the latter along the midrib, but along 

 the margin the most. The average length of the adult female 

 is 3.5 mm., width 3 mm., height 2 mm. The shape and pro- 

 portions vary greatly, according as the scale is formed upon 

 leaf or twig. 



Treatment. — Kerosene emulsion (formula No. 3). 



Genus MYTILASPIS, Targioni-Tozzetti. 



Female and male puparia similar, or nearly similar, in 

 shape, but the male puparium is smaller. Puparia enlongated, 

 generally more or less mussel-shaped or pyriform, usually 

 convex, more or less curved, pellicles at one end. Male pupa- 

 ria not carinated. Five groups of spinnerets in the female, 

 but the groups are sometimes continuous. 



The following species are found in this State: 



(1) Purple scale — Mytilaspis citricola, Packard. 



(2) Long scale — Mytilasins Gloverii, Packard. 



(1) Purple Scale. 



(Fig. 2, Plate XXV.) 



A long purple scale; infests citrus trees principally. In 

 Florida it is a very troublesome pest, and was recently intro- 

 duced into California on trees imported from that State. 



Scale of female long, more or less curved and widened pos- 

 teriorly, brown, with exuvias of same color; length, .12 inch. 

 Female yellowish white. Scale of male usually straight, or 

 nearly so, of same color as scale of female. Egg white, 

 arranged irregularly under the scale. 



