KEY TO HOMOPTERA. 



Our species less than .5 in. long; usually not more than 

 two ocelli, and front tibiae not enlarged 3. 



3. Antennae arising from below the eyes; ocelli placed 

 beneath or near the eyes, usually in cavities of the cheeks; 



pronotum not unusually developed FULGORID/E 



(p. 85) in a broad sense. 



Antennas arising from in front of and between the eyes ; 

 ocelli (rarely absent) not usually below the eyes 4. 



4. Pronotum extending back over the abdomen 



MEMBRACID/E (p. 84). 

 Pronotum not extending over the base of the abdomen. 



5- 



5. Tibiae smooth, the hind pair with one or two 

 stout spines and with a cluster of spinules at the 

 apex CERCOPID^E (p. 86). 



Hind tibias with two rows of spines beneath 



ClCADELLID.E (p. 86). 



Leaf-hoppers of which Jassinae is the principal subfamily. 



6. Hind femora much thickened; antennas long, 5- to 

 lo-jointed, last joint with two fine apical bristles; front 

 wings somewhat thicker than the hind, often rather 

 leathery; pad between the tarsal claws prominent, bilobed. 



CHERMIDA (p. 86). 

 Hind femora not much larger than the others 7. 



7. Tarsi 2-jointed, the basal joint sometimes reduced, 

 the outer joint with two claws; wings, w r hen present, four 

 in number; mouth-parts usually well-developed in both 

 sexes 8. 



Tarsi, when present, i-jointed, with a single claw; 

 females always wingless, often without legs and usually 

 covered with a more or less well-developed scale; males 

 usually with a single pair of wings which lie flat, one above 

 the other; antennas of females absent or having up to n 

 joints, of males 10- to 25-jointed COCCID^E (p. 91). 



8. Wings usually opaque, whitish, clouded or mottled 

 with spots or bands; body more or less mealy; tarsi with 

 2 nearly equal joints; tip of tibiae with a number of short 

 spines; a pad-shaped or spine-like process between the 

 tarsal claws ALEYRODID^: (p. 90). 



Wings transparent, though sometimes colored; tarsi 

 2-jointed, the basal joint sometimes very much reduced; 



6 81 



