Bugs, Cicadas, Aphids, and Scale-insects 195 



Head shorter than thorax. 



Last segment of foot divided and the claws not at the tip. 



Middle and hind legs very long (Water-striders.) HYDROBATID.E. 



Middle and hind legs not very long VELIHXE. 



Last segment of foot not divided, and the claws at the tip. 

 Antennae 3- or 4-segmented. 



Proboscis (or beak) with three joints. 



Body very long and slender (Thread-legged bugs.) EMESID^E. 



Body not long and slender. 



Femora of fore legs very wide (Ambush-bugs.) PHYMATID^-:. 



Femora of fore legs not very wide. 



Fore wings usually lacking or rudimentary; when so, ocelli are absent. 



(Bedbugs.) ACANTHIID.E. 



Fore wings usually present; when absent, ocelli are always present. 

 Hind feet consisting of three joints. 



Beak long and slender (Shore-bugs.) SALDID.E. 



Beak short and stout (Assassin-bugs.) REDUVIID.E. 



Hind feet consisting of two joints (Flatbugs.) ARADUXE. 



Proboscis (or beak) with four joints. 

 Without ocelli. 



Heavy-bodied insects, membrane of wings (in adults) with two large cells 

 at the base from which arise about eight branching veins (Fig. 268, 2). 



(Redbugs.) PYRROCHORID.E. 



Light -bodied insects; membrane of wings (in adults) with one orHwo closed 

 cells at the base and with no longitudinal veins (Fig. 268, i). 



(Leaf- and flower-bugs.) CAPSID.E. 

 With ocelli. 



Fore legs very different from the others; wings when present in fully de- 

 veloped condition with four long veins in the membrane bounding three 

 discal cells, which are often open; from these cells diverge veins which 

 form several marginal cells (Fig. 268, s) . . . (Damsel-bugs.) NABID.E. 

 Fore legs not very different from the others. 



Body very narrow (Stilt-bugs.) BERYTID^E. 



Body not very slender. 



Feet of two joints; wing-covers (of adults) resembling lace network. 



(Lace-bugs.) TINGITID^:. 

 Feet of three joints. 



Antennae inserted below an imaginary line drawn from the eye to the 

 beak ; membrane of wing (in adults) with four or five simple veins 

 arising from its base, the two inner veins sometimes joined to a 

 cell near the base (Fig. 268, 3) . - (Chinch-bug family.) LYG^ID^:. 

 Antennae inserted above an imaginary line drawn from the eye to the 

 beak ; membrane of wings (in adults) with many usually forked 

 veins, springing from a transverse basal vein (Fig. 268, 4). 



(Squash-bug family.) COREID^:. 

 Antennae 5-segmented. 

 Body flat above. 



With few or no spines on the tibiae (Stink-bugs.) PENTATOMID^:. 



With rows of spines on the tibiae (Burrower-bugs.) CYDNID.E. 



Body strongly convex above. 



Prothorax round in front and nearly straight behind. 



(Negro-bugs.) CORIMEL^NID^;. 

 Prothorax hexagonal (Shield-backed bugs.) SCUTELLERID^E. 



