40 



CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



Eulecanium tulipiferae Cook. 



This species is known as the "soft tulip scale," and is quite a serious pest 

 in the East. It was first noticed in California in 1905, but had 

 evidently been here for some time, as I found quite an extensive area 

 infested. The species seems to confine its attack to cherry trees, usually 

 on the under side of the larger lowest limbs. 



This is a very large Eulecanium (?), dark brown in color, about -$ of an 

 inch high and of about the same width. The scale has a rather frosted 

 appearance, in this respect somewhat resembling E. pruinosum, only 

 much larger. There are two distinct irregular, black longitudinal lines 

 on the dorsal surface of the scale. Steps were immediately taken to 

 control its further spread and to eradicate the present infestation. 



Saissetia hemisphserica Targ. 

 ( Hemispherical Scale. ) 



Adult Female. Shape approaching hemispherical, with the edges 



flattened. Average length, 3.5 mm.; 

 width, 3 mm.; height, 2 mm. The 

 shape and proportion vary some- 

 what, according as the scale is formed 

 upon a leaf or twig. Upon the rounded 

 twig it loses something of its hemi- 

 spherical form, becomes more elon- 

 gate, and its flattened edges are bent 

 downward, clasping the twig. The 

 color varies from a very light brown 

 when young to a dark brown, occa- 

 sionally slightly tinged with reddish, 

 when old. The oval cells of the skin 

 vary in length from .01 mm. to 

 .04 mm.; and each cell contains a 

 large granular nucleus. The antennae 

 are 8-jointed, with joints 1 and 2 short 

 and thick; joint 3 is the longest, and 

 the succeeding joints decrease gradu- 

 ally in length to joint 8, which is 

 longer than the preceding. The legs 

 are long and rather slender. The 

 bristle on the trochanter is long. The 

 articulation of the tarsi is very well 

 marked. The tarsal digitules are, as 

 usual, two long and two short; those of the claws spreading widely at 

 summit and very stout at the base. The anogenital ring is furnished 

 with eight long hairs. The anal plates are triangular, with rounded 



FIG. 18. Saissetia hemisphxrica (Hemi- 

 spherical Scale). On orange, a, female, 

 greatly enlarged. 



