Bugs, Cicadas, Aphids, and Scale-insects 
1 95 
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.... Veliid^e. 
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.) Phymatida*:. 
Femora of fore legs not very wide. 
Antennae of three segments..(Assassin-bugs.) Reduviid^e. 
Antennae of four segments. 
Feet of two joints, and body very flat.(Flatbugs.) Aradid^e. 
Feet of three joints. 
Body flat on top.(Bedbugs.) Acanthiid^e. 
Body not flat on top.(Shore-bugs.) Saldidjs. 
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 or two closed 
cells at the base and with no longitudinal veins (Fig. 268, 1). 
(Leaf- and flower-bugs.) Capsids. 
No 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, 5)-- . (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.) Tingitida:. 
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^eid^e. 
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.) Coreida:. 
Antennae 5-segmented. 
Body flat above. 
With few or no spines on the tibiae.(Stink-bugs.) Pentatomid^e. 
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^e. 
Prothorax hexagonal.(Shield-backed bugs.) Scutellerid^e. 
