260 STATE BOARD OF HORTICULTURE. 



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

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

 larva oval, long. Viviparous. 



This species is not a serious pest and is easil^y subdued. 

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

 as to prevent its doing material injury. 



Treatment. — Hosin 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 settles 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. 



Treafme^tf.- -Kerosene emulsion (formula No. 3). 



Genus MYTILASPIS, Ta.rgioni-Tozzetti. 



Female and male puparia similar, or nearly similar, in 

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

 generally more or less mussel-shaped or pyriform, usuallj' 

 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 — Mytilaspis 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 introduced into 

 California about fifteen years ago on trees imported from that 

 State. 



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

 teriorly, brown, with exuviae 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. 



