HEMIPTERA. 149 



B. With three ocelli, and the males with musical organs. Usually 

 large insects, with all the wings entirely membranous, p. 149. 



ClCADID^E. 



BB. Ocelli only two in number or wanting ; males without musi- 

 cal organs. 

 C. Antennae inserted on the sides of the cheeks beneath the 



eyes. p. 151 FuLGORlD^E. 



CC. Antennae inserted in front of and between the eyes. 

 D. Prothorax not prolonged above the abdomen. 



E. Hind tibiae armed with one or two stout teeth, and the 



tip crowned with short stout spines p. 152... CERCOPID/E. 



EE. Hind tibiae having a row of spines below p. 153. JASSID^E. 



DD. Prothorax prolonged into a horn or point above the 



abdomen, p. 154 MEMBRACIM:. 



AA. Beak apparently arising from between the front legs, or absent; 

 tarsi one or two jointed ; antennae usually prominent and thread- 

 like, sometimes wanting. 



B. Tarsi usually two-jointed ; wings when present four in number. 

 C. Wings transparent. 



D. Hind legs fitted for leaping; antennae nine or ten jointed. 



p. 155 PSYLLID/E. 



D. Legs long and slender, not fitted for leaping ; antennae 



three to seven jointed, p. 1 56 APHIDID.*. 



CC. Wings opaque, whitish ; wings and body covered with a 



whitish powder, p. 163 ALEYRODIDYE. 



BB. Tarsi one-jointed ; adult male without any beak, and with 

 only two wings; female wingless, with the body either scale- 

 like or gall-like in form, or grub-like and clothed with wax. The 

 waxy covering may be in the form of powder, of large tufts or 

 plates, of a continuous layer, or of a thin scale beneath which the 

 insect lives, p. 164 COCCID^E. 



Family ClCADID/E (Ci-cacl'i-dae). 

 The Cicadas (Ci-ca'das). 



The large size and well-known songs of the more common 

 species of this family render them familiar objects. It is only 

 necessary to refer to the Periodical Cicada (or the seventeen- 

 year locust, as it has been improperly termed) and to the 



