20 



CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



The cocoon of the male is rather close, though thin, flattened oval, 

 and pure white, about 2 mm. long by 1 mm. wide, and is composed of 

 rather coarse waxy fibers. 



On elm trees. 



We have but one generation of the scale a year in California. The 

 young are brought forth alive during May, locate on the leaves and 

 later settle on the branches. 



In other states this species has proven a very destructive pest to the 

 elms. In one locality in California it gained quite a foothold, but 

 prompt remedial measures were applied and the scale has not been 

 allowed to increase, although scattering specimens may be found on 

 some of the trees originally infested. 



Erioeoeeus araucaria Mask. 



The presence of the black fungus which accompanies many species 



of coccids, usually first denotes ' 

 the presence of this scale. The 

 full-grown insects are contained 

 in white cocoon-like sacks, which 

 are often massed toward the ends 

 of the twigs. The larvae are in- 

 conspicuous and are found in the 

 angles formed by the bases of the 

 leaves. Both sexes are similar 

 in the larval form. They are 

 greenish yellow in color; the 

 posterior end of the body is fur- 

 nished with two prominent lobes, 

 each terminated by a long hair. 

 Between these lobes there is a 

 conical mass of white waxy mat- 

 ter projecting backward. The 

 margin of the body is fringed with a row of tubular spinnerets. The 

 female when full grown measures 2.3 mm. in length. When the female 

 is ready to lay her eggs, she excretes a cocoon-like covering to the 

 body, composed of white waxen threads. This sac is dense, like felt, 

 but easily torn, and appears to be open on the middle line of the ven- 

 tral surface. It adheres to the tree quite firmly, remaining where 

 excreted after the death of the insect. 

 On Araucaria excelsa, A. bidwillii. 



Erioeoeeus adenostomse Ehrh. 



Female. Inclosed in an oval (at one end more or less pointed) sac 

 about 3 mm. long and li mm. broad, woolly, snow-white, of uniform 



FIG. 6. 



Erioeoeeus araucaria. On Araucaria 

 bidwillii. 



