134 AN INTRODUCTION TO F..\ ^GY. 



B. Tarsi one-jointed; adult male without any beak and with only two 

 female wingless, with body either scale-like or gall-like in form, or ^rub 

 and clothed with wax. The waxy covering may be in the form oT 

 powder, of large tufts or plates, of a continuous layer, or of a thin scale 

 beneath which ihe insect lives. 



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

 C. Wings opaque, whitish : wings and body covered with a whitish pow- 

 der. 3. ALEYRODlDv. 

 CC. Wings transparent. 



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



seven -jointed. 4. APHIDID.*. 



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



5. IM'U.lD^E. 



AA. Beak evidently arising from the mentum ; tarsi three-jointed; antennae 

 minute, setiform. 

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



insects, with all the wings entirely membranous. 



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

 C. Antennae inserted on the side of the cheeks beneath the eyes. 



8. FUL<;<>KII> i 

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



D. Prothorax prolonged into a horn or point above the abdomen. 



6. MEMBRA* 

 DD. Prothorax not prolonged above the abdomen. 



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



with short, stout spines. 9. CERCOPID.. 



EE. Hind tibiae having a double row of spines below. 10. JASSID^. 



Family II. COCCID,E.* 

 (Scale-insects or Bark-lice, Mealy-bugs, ct al.) 



The family Coccidce includes tin: Scale-insects or Hark-lue. 

 Mealy-bugs, and certain other insects for which there are no popu- 

 lar names. In many respects this is a very anomalous group, the 

 species differing greatly in appearance, habits, and metamorphoses 

 from those of the most closely allied families. Not only do the 

 members nf this family appear very unlike other insects, but thnv 

 nderful variety of forms within the family; and even the 

 two sexes of the same species differ as much in the adult 

 members of distinct ord< 



111- males of Coccidae, unlike all other Hemiptera, undergo a 

 complete metamorphosis. The adult males have only a single pair 



*C6ccida% Coccus : cotcum, " the berry that grows upon the scarlet oak." This sup- 

 posed berry was a bark-louse. 



