Vol.1] Essig. — Aphididae of California 307 



SEXUALES 



Female 

 The sexual female is large, robust and apterous, varying from 

 whitish to very pale yellow and immaculate excepting the dark 

 patches on the antennae and tarsi as well as the pitch black cauda. 

 The length averages 2mm. and the width 1.3 nun. The dorsum 

 has four longitudinal rows of hair-like spines which arise from 

 quite large tubercles. The antennae (fig. 3, C, D) are longer 

 than the body, the individual articles being as follows: I 0.11 

 mm., II 0.07 mm.. Ill 0.9 mm., IV 0.57 mm., V 0.5 mm., VI 0.66 



Fic. 3. Myzorallis arnndicolens (Clarke). Sexual female. A, side 

 view; B, hind tibia showing sensoria; C and D, antenna; E, cornicle. 

 (Original.) 



mm. (base 0.31 mm., filament 0.35 mm.), total 2.81 mm. The 

 sensoria are transversely oval and similarly located as in the 

 other forms, but are fewer in number, varying from none at all 

 to three or four. The hind tibiae (fig. 3, B) are swollen and 

 covered with a great many small circular sensoria. 



Eggs 

 The eggs are pale yellow or whitish when first laid, but soon 

 become shining black. They are oval with a conspicuous blunt 

 stipe or pedicel at one end. The length averages 0.07 mm. They 

 are deposited singly, in uneven masses or more often in rows 

 on the undersides of the leaves and are at once conspicuous to 

 the naked eye. 



