Vol.1] 



Essig. — Aphididae of California 



311 



Symydobius'^ agrifoliae, n. sp. 



This species was first collected by S. H. Essig and the writer 

 in 1911, but as only apterous forms were secured at that time no 

 attempt was made to describe it. During the spring of 1916 a 

 number of winged and apterous %'iviparous females were taken 

 by S. H. Essig and forwarded to the writer. As previously 

 believed it proved to be a new species, which I am naming after 

 the species of the host plant. It is with gratitude here that I 

 acknowledge the great help constantly given by my brother men- 

 tioned above. 



Fig. 6. Symydobius agrifoliae, ii. sp. Apterous viviparous female. A, 

 dorsal aspect; B, cauda and anal plate; C, cornicle; D, antenna. 

 (Original.) 



APTEROUS YIYIPAROUS FEMALE— YIRGOGENIA 



The mature apterous female is rather robust and of a dark 

 reddish brown color with lighter amber or yellowish markings 

 describing roughly the letter Y on the back. The dorsum and 

 sides are also obscurely marked with black blotches. The length 

 averages about 1.6 mm., and the greatest width is 1.1 mm. The 

 head is rather narrow and pale amber at the bases of the 

 antennae. The eyes are dark red. The antennae (fig. 6, D) are 



5 The genus Symydobius has been wrongly spelled Symdobius in the 

 author's former articles. 



