EBEliHART'S KEY TO THE FAMILIES OF INSECTS. 



A KEY TO THE FAMILIES OF ORTHOPTERA. 



A. Hind legs elongated and adapted to leaping. 



a. Antennae much longer than body. 

 b. Tarsi 3-jointed. 



Gbtllid.« (Crickets). 



bb Tarei 4-articled. 



Locustid-e (Katy-dids). 



aa. Antenna? shorter than body. Tarsi 3-jointed. 



Acridid.e (Grasshoppers). 



AA. Legs more or less equal and fitted for walking,— 5-jointed tarsi. 

 c. Abdomen with strong forceps at the end. 



Forficulid.-f. ( Earwigs i. 



cc. Abdomen without forceps. 



d. Thorax very long, and narrower than the horizontal head; front legs very large 

 and adapted to grasping. 



Mantidve (Praying Mantes). 



dd. Body very long and slender; head not perceptibly wider than thorax. Legs all 

 about the same size. 



Phasmid^e ( Walking Slicks). 



Odd. Head partially concealed under the expanded prothorax (first segment of 

 thorax). Flat body. 



Blattid^e (Cockroaches). 



A KEY TO THE FAMILIES OF HEMIPTERA. 



A. Vertical head ; wings membranous or coriaceous throughout. 



Sub-order, Homoitera. 



AA. Horizontal head ; base of fore or upper wings coriaceous. 



Suborder, Heteroptera. 



HOMOPTERA. 



A. Tarsi 3-jointed. 



a. Antennae b or 7-jointed; ocelli at the corners of a triangle on the back of the head. 



Cicadid.k (17-year Cicadas), 

 aa. Antennae 2 or 3-jointed. 



b. Ocelli placed beneath the compound eyes; antenniv 3-jointed. 



FtfLGORIDiE. 



bb. Ocelli (if present) placed on the forehead; head broad and triangular; antennte 



apparently 2 jointed. 



Cercopid.f. (Leaf-hoppers). 



AA. Tarsi 2-jointed. 



c. Antennae 10-jointed, ending in two short bristles. 



Psyllid.f. (Leaf-hoppeis). 



cc. Antennae 7 -10- jointed; no bristles. 



APHiDiE (Plant-lice). 



AAA. Tarsi 1 -jointed. 



CocciD.t: {Bark-lice). 



