— 26 — 



//. Wings not covering the abdomen. 

 J. — Margins of thorax and abdomen elevated, angular, head ftot 



flattened Phymatidae. 



././. -Thorax and abdomen exceedingly depressed, (live under 



bark) Aradidae. 



.1.1. Head cylindrical, distinctly separate from b >dy, base of rostrum curved. An 

 tennse usually tapering, prothorax with transverse suture. 



K. — Rostrum long, slender Nabidae. 



KK. Rostrum short, stout Reduviidae. 



** ANTENNAE (EXCEPT IN GALGULIDAE) PROMINENT. 

 ft Legs usually very long and slender, the tarsi furious!// modified/or locomotion on 



surface of water or life in marshy places. 

 A. — Antenme very conspicuous. 



B. — Antennas slender. Bodies linear Hydrometridae. 



BB. — Antennae short and thick or with basal joint stout and outer joints slender 



Velliidae. 

 BBB. — Antennae long, conspicuous. 



C. —Ocelli and scutellum apparently absent Hydrobatidae. 



CC. - Ocelli present, size small Saldidae . 



A A. — Antennae inconspicuous, ocelli present Galgulidae. 



*** ANTENNAE ALWAYS CONCEALED IN CAVITIES OF THE HEAD. 

 Iff Legs often ciliated. (Aquatic forms.) 

 A. — Head inserted in prothorax, fore tarsi normal. 

 B. — Bodies flat oval or ovate. 



C. —Without caudal setae Naucoridae. 



CC. — With strap-like caudal appendage Belostomidae. 



BB. — Bodies flat, oval, ovate or elongated, with long respiratory caudal setae 



Nepidae. 



HUH. Bodies thick, usually soft, convex above Notonectidae. 



.1.1. — Head overlapping the prothoiax, fore tarsi flattened and ciliated. . . .Corisidae. 



HOMOPTERA. 

 * BEAK DISTINCTLY SEPARATE FROM STERNUM. 



Tarsi three-jointed. Antennw minute, setiform. 

 A. — Wings more or less opaque, usually narrow, sometimes very broad. 



B. — Prothorax well developed. Antennae placed between the eyes. Scutellum 

 triangular. 

 C. --Bodies usually rather slender, front little, if any, produced or carinated. 



D. — Ocelli on vertex Tettigonidae. 



DD. — Ocelli on front Jassidae. 



CC. — Bodies usually stout, ocelli on vertex, front usually carinate. ... Cercopidae. 

 llll. —Prothorax weak, often but slightly developed, antennae and ocelli placed 

 beneath the eyes, front often produced, scutellum inconspicuous.. Fulgondae. 

 .1.1. Wings entirely membranous, strongly veined. 



D. — Prothorax normal, not covering wings. Wings broad, size large, males 



musical Cicadidae. 



DD. — Prothorax greatly enlarged, covering the wings and often the entire body 

 Membracidae. 



