1330 



The Zoologist — August, 1868. 



Tribe 3. Pemphigus, Passerini. 



A. Cubital vein forked at the tip. 

 AA. Cubital vein simple. 



A. Hind wings with two oblique veins. 

 AA. Hind wings with one oblique vein. 

 a. Wings deflexed. 

 aa. Wiugs horizontal. 



1. ScHIZONEUUA. 



2. Pemphigus. 



3. Tetranecra. 

 4. Aploneura. 



Genus 1. Schizoneuka, Hartig. 



Antennae six-jointed. Nectaries none or rudimentary. Wings 

 deflexed. Fore wings with four oblique veins ; cubital vein once- 

 forked. Hind wings with two oblique veins. 



Typical species, Aphis Corui, Linn. 



A. Antennae pilose; third joint shorter than the three following 

 joints together. 

 A. Abdomen with a black somewhat round dorsal spot, and 

 with black marginal points. .... 



AA. Abdomen black above, with a whitish line at the base and 

 with a whitish tip. ..... 



AA. Antenna? scabrous, not pilose; third joint longer than the three 

 following joints together. 

 A. Antennae with the fourth and fifth joints of equal length ; 

 sixth shorter than the fifth. 

 a. Abdomen wrapped with long and thick wool. 

 aa. Abdomen slightly woolly or nearly bare. . 

 A A. Fourth joint of the antenna: 1 longer than the fifth; sixth as 

 long as the fifth. . . 



1. venusla. 



2. Corni. 



:\. I 'a nil/era. 

 lanuginosa. 



;'>. Vim). 



Genus 2. Pemphigus, Hartig. 



Antenna? six-jointed. Fore wings with four simple oblique veins. 

 Hind wings with two oblique veins. 

 Typical species, Aphis bursa ria, Linn. 



A. Oblique veins of hind wings proceeding separately from the 

 submarginal line. 

 A. Sixth joint of the antenna? as long or longer than the fifth. 

 a. Veins of the fore wings pale slender; first and second 

 oblique veins joined together at the base. 

 a. Sixth joint of the antennae as long as the fifth or scarcely 

 longer. First and second oblique veins very short, 

 joined together at the base. .... 1. utricular ins. 

 aa. Sixth joint of the antennae at least twite the length of 

 the fifth. First and second oblique veins of the fore 

 wings joined together fur a long space from the base. 3, cornicularius. 



