54 



CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



inent, usually one pair to each segment, a rather deep incision just 

 laterad of the lobe; anal opening about twice as distant from the base 

 of the lobes as the lobes are long; spinnerets grouped about curious 

 club-shaped organs. 



On bacillus calif ornicn. 



Aspidiotus hederse Vail. 



(Oleander and Lemon Scale.) 



Scale of Female. Flat, lightish or light gray in color, and with 

 exuvise central or nearly so; exuviae dull orange-yellow; the first skin 



usually showing the segmentation 

 distinctly, the second skin more or 

 less covered with secretion, often 

 appearing only as an orange-colored 

 circle surrounding the first skin. 

 Ventral scale a mere film applied 

 to bark of plants. Diameter of 

 fully formed scale, 2 mm. 



Female. Body of adult nearly 

 circular, with abdominal segments 

 forming a pointed projection; light 

 yellow in color, mottled with darker 

 yellow; the last segment presents 

 the following characters: The ante- 

 rior lateral group of spinnerets con- 

 sists of about 9, and the posterior 

 laterals of about 7. There are three 

 pairs of lobes; the first and second 

 are well developed, the third quite 

 small. The plates are well devel- 

 oped; they are long and usually 

 fringed; there are two small ones 

 between the median lobes; those of 

 each side are as follows: Two be- 

 tween the first and second lobes; 

 three between second and third 

 lobes; and usually seven laterad of 

 the third lobe, of which usually 

 four are fringed and three simple. 

 The number of the last-named group varies from four to nine. There 

 is on each surface of the segment a spine accompanying each lobe; one 

 between the fourth and fifth plates laterad of third lobe, and one at 



FIG. 26. Aspidiotus hederx (Oleander Scale). 

 On branch of oleander, showing leaves 

 thickly infested. 



