TABLE OF HOMOPTERA. 313 



SECTION II. DIMERA. 



Tarsi, two joints. 



Antennae longer than head ; six to ten long slender 



joints. 



Ocelli generally present, three. 

 Wings, hind and fore all clear.* 



* Antennae six to ten joints long, or moderate. 

 Abdomen with appendages. 

 Wings at rest shelving. 



a. Antennae ten joints; in front of the eyes. 

 Thorax very large. 



Abdomen with visible ovipositor. 



with several erect appendages. 

 Wings at rest shelving. 

 Face notched. 

 Insect saltatorial. 

 Family 1. Psyllidse. 



Ex." Apple Aphis " (falsely so called). 



b. Antennas (six or) seven joints, third longest. 

 Abdomen with two slender tubercles. 

 Wings at rest nearly perpendicular ; fore-wing 



much the largest. 

 Insect crawling. 

 Family 2. Aphidae. 

 Ex. Rose Aphis. 



** Antennae short, six joints. 

 Eyes divided into two pairs. 

 Abdomen without external appendages. 

 a. Wings at rest nearly horizontal. Powdered. 

 Family 3. Aleyrodidae. 

 Ex. Aleyrodes. 



* Covered with powder in Aleyrodes. 



