﻿APHIDIDAE OF SOUTHERN CALIFORNIA V 



1!Y E. O. ESSIG 



HORTICULTURAL CUM 11 ISSUJNKR C)F VENTURA COl'NTV, CALUHiKXlA. 



Aphis ht^dcrae Kalteiibach 



I'Vingcd I 'h'il^aroiis I'cmalc (Fig. 124 A). — Average length, 1.3 iiiiii., 

 average width 3 mm., wing expansion 4.3 mm. Prevailing color — Shiny l)lack 

 throughont. In mounted specimens the color may become dark brown, due 

 to the action of the mounting materials. Head — Narrower than thorax, and 

 nearly as long as wide. Coiiif'otiud eyes — coarsely faceted, jet black, with 

 usual terete tubercles on outer margins. Antennae (Fig. 124 A) arise from 

 slight frontal tubercles, which are not prominent, three-fourths the length 

 of the body, 6 (commonly called 7) -articled. The first two articles are very 

 dark, while the remainder are from a dark yellow to an amber color. The 

 antennje vary considerable, because of the variability of the insect. The 

 following lengths are approximate: I 0.05 mm., II 0.03 mm.. Ill 0.22 mm., 

 IV 0.19 mm., \' 0.17 mm.. VI 0.37 mm. Sensoria are quite numercnis on 



Figure 12i. Aphis hederae. 

 A winged viviparous t'einale; B, ajiteruus viviparous female. 



article III, four are visible on article I\', and two on article \'. .More are 

 likely visible from different angles, this simply being the usual number seen 

 looking down on the antennae. Prothorax much wider than long and witli 

 a distinct lateral tubercle on tiie lateral margins just back of the midilio. 

 Rostrum — Lemon yellow in color with a dusky tip, reaching just Ijcyond tlic 

 prothoracic coxae. Abdomen — Shiny black, well rounded and smooth, with 

 few depressions to mark segmentation. Cornicles — Color, dark yellow i>r 

 amber, cylindrical, much longer than the style and several times as long as the 

 tarsi. They gradually taper from the base to the tip. Legs — Moderately long 

 and hairy. The coxae and trochanters are black, tips of femurs and tips <if 

 tibia;, as well as entire tarsi are black, while the bases of the femurs ancl 

 tibiae are lemon \ellow. Wings — Of the normal Aphis type; hyaline; stigma 

 long, narrow, and well pigmented. Length of primary 2 mm., widlii 0.9 



