— 26 — 



//. Winsrs not covering the abdomen. 

 J. — Margins of thorax and abd<imen elevated, angular, head not 



flattened Phymatidae. 



■ JJ. — Thorax and abilonien exceedin;4ly depressed, (live under 



bark) Aradidae. 



,1.-1. Head cylindrical, distinctly separate from bxly, base of rostriun curved. An- 

 tenna; usually tapering, prothorax with transverse suture. 



K. —Rostrum long, slender Nabidae. 



A'A'.— Rostrum short, stout Reduviidae. 



** ANTENN.\E (EXCEPT IN G.VLGULIDAE) PROMINENT. 

 tt Le<is ((sudlly very long and slender, the tarsi variously modified for locomotion on 



sutface of writer or life in marshy places. 

 A. — Antenme very conspicuous. 



B. — Antenn3e slender. Bodies linear Hydrometridae. 



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



Velliidae, 

 TiBB. — Antennae long, conspicuous. 



C — Ocelli and scutellum apparently absent Hydrobatidae. 



(76'. -Ocelli present, size small Saldidae. 



A A. — Antennee inconspicuous, ocelli present Galgulidae. 



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

 ttt Legs often ciliated, {xiquatic forms.) 

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

 B. — Bodies flat oval or ovate. 



C. —Without caudal seta; Naucoridae. 



CC. — With strap-like caudal appendage Belostomidae. 



BB. — Bodies flat, ova!, ovate or elongated, with long respiratory caudal setK 



Nepidae. 



BBB. -Bodies thick, usually soft, convex above Notonectidae. 



AA. — Head overlapping the prothoiax, f(jre tarsi flattened and ciliated, . . .Corisidae. 



HOMOPTERA. 



* BEAK DISTIN'CTLY SEPAR.VTE FROM STERNUM. 

 Tarsi tliree-jointed. Antenna' minute, .setifw'm. 

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



B. — Prothorax well developed. Antenna; placed between the eyes. Scutelluni 

 triangular, 

 t' -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. 

 BB. — Prothorax weak, often but slightly developed, antenn;^ and ocelli placed 

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

 ^Ll. — W'ings entirely membranous, strongly veined. 



D. — Prothorax normal, not covering wings. W'ings broad, size large, males 



musical Cicadidae. 



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

 Membracidae. 



