60 CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



tially effective against it in this State, but does not do good enough work 

 to be of much use. This species is distributed all over the State, and 

 while it is troublesome to individuals, yet it has not attacked any of 

 our commercial trees or plants extensively enough to be really con- 

 sidered of much economic importance. 



Pseudaonidia duplex Ckll. 



Scale of Female. — The female scale is about 2| mm. in diameter, sub- 

 circular, moderately convex, dark blackish brown, with the large round 

 exuviee nearly to one side, and orange in color. When upon the stems 

 and larger twigs of the camellia the scale has the same brown color of 

 the bark and is easily overlooked. When removed the scale leaves a 

 white patch on the branch. 



Female. — Pale orange, broadly oval or subcircular, with the large 

 cephalic portion separated from the rest by a deep suture. Mouth parts 

 large; skin on dorsum very strongly, transversely grooved, the grooves 

 linear, often anastomosing. Four groups of ventral glands in the usual 

 situation; caudo-laterals of 28 to 30, cephalo-laterals of 42; median group 

 represented by two orifices, not very close to each other. Besides these 

 groups there is a group of 17 to 22 orifices, quite similar in character, 

 on each side of the mouth parts; these groups are oval in outline. The 

 anus is about on a level with the anterior ends of the caudo-lateral 

 groups. There are four (two on each side) long tubes or ducts originating 

 about the region between the caudo-lateral groups and the anus, and 

 passing hindward, practically parallel, to the end of the body. On 

 the dorsal surfaces the segments are marked by rows of oval pores. 

 The pygidium shows on the dorsal surface a very distinct lattice-work, 

 as in A. these and Ischnaspis jiliformis. Median lobes very large, brown, 

 rounded at the ends, but notched on each side so as to be trilobed; the 

 lateral lobes very small and passing into the straight parallel sides. 

 The median lobes are very close together, but distinctly separated, not 

 touching, not diverging. There are three other pairs of lobes, small, 

 narrow, rounded at ends, very inconspicuous and easily overlooked 

 among the scale-like plates. Plates not extending beyond lobes, scale- 

 like, not separately distinguishable, but forming a continuous fringe, 

 which rapidly narrows beyond the fourth lobe, and ceases before the 

 deep notch which indicates another segment. Margin cephalad of 

 fourth lobe distinctly serrate, serrations coarse. 



On Camellia japonica (in greenhouses). 



