190 INTRODUCTION TO ZOOLOGY. 



E— Wings transparent, 

 r— Hiud legs fitted for leaping; autennse nine- or ten-jointed. 



(Psyllidae.) 

 FF— Legs long and slender, not fitted for leaping; antenniE three- to 



seven-jointed (AphididaD.) 



EE— Wings opaque, whitisli; wings and tody covered vifith a whlcish 



powder (Aleyrodidaa. ) 



DD— Tarsi one-jointed; adult male without any beak and with only two 



wings ; female vi'ingless. Scale insects (Coceldse. ) 



AA— Wingless ; fleshy, unjointed beak. Lice (PediculidiE. ) 



Glossary for the Table of Hemiptera. 



Caudal— towaris the tail, or posterior part. 



Corium—the thickened basal portion of the fore wings. 



Cuneus—a triangular portion of the terminal part of the corium marked ofl 



from the rest by a line. 

 Membrane — the thin posterior portion of the fore vidngs. 

 Scuteilum — the triangular piece on the back between the bases of the fore 

 wings. 



Table for Determining the Families of Neuroptera. 



(Odonata, Ephemerida, Corrodentia, Plecoptera, Isoptera, Mecoptera, Neu- 

 roptera, Trichoptera, Mallophaga.) 

 A — Wingless, or with rudimentary wings. 

 B— mouth parts fitted for biting. 



C — Head with a long trunk-like beak (Pauorpida3.) 



CC— Head not prolonged into a trunk. 

 D — Louse-like insects. 

 E — Antennae not more than five segments. Bird lice. . . (Mallophagidae. ) 



EE— Antennae with many segments. Book lice (Psocid^. ) 



DD — Not louse-like; abdomen sessile; legs not fitted for jumping; body 



white and somewhat ant-like in form (Termitidae.) 



AA— Winged. 

 B— With two membranous wings ; abdomen with caudal filaments ; mouth 



parts rudimentary; halteres wanting (Ephemeridae.) 



BB — With two pairs of wings. Wings similar, membranous. 

 C — Wings net-veined, with many veins and cross veins. 

 D— Tarsi consisting of less than five segments. 

 E — Antennae inconspicuous, awl shaped, short, and .slender. 

 F— First and second pair of wings nearly the same length; tarsi three- 

 jointed. Dragon flies (Libellulidse. ) 



FF— Second pair of wings either small or wanting; tarsi four-jointed. 



(Ephemeridae.) 

 BE— Antennae usually conspicuous, not awl shaped aud'slender. 

 F— Tarsi two- or three-jointed. 



G— Second pair of wings the smaller (Psoeidae. ) 



GG— Second pair of wings broader, or at least of the same size as the 



first pair (Perlidae. i 



FF — Tarsi four -jointed, wings equal (Termitidae.) 



DD— Tarsi consisting of five segments. 

 E— Abdomen vrith setiform, many -jointed anal filaments. 



(Ephemeridce.) 

 EE— Abdomen without many-jointed anal filaments. 



F— Head prolonged into a trunk-like beak (PanorpidaB.) 



FF — Head not prolonged into a beak. 

 G— Prothorax as long as or longer than the meso- and meta-thorax 

 combined. 

 H— Fore legs greatly enlarged and fitted for grasping. 



(MantispidiE.) 

 HH— Fore legs not enlarged and not fitted for grasping. 



(Raphldlidae.) 

 GG — Prothorax not so long as the meso- and meta-thorax com- 

 bined. 



