HETEROPTERA. NOTONECTIDH —HYDROMETRIDZ. 119 
Orper XI. HETEROPTERA. (Hemiptera Macl.., Steph. Hem. 
Hereroprera Lar, Hemimeroptera p.Clv. Ruyneora p. Fabr.) 
Sect. I. Hyprocorisa Latr. 
Family 1. NOTONECTIDZ Leach. (Notonectici Burm.) 
NOTONECTA Lin, ——— 3 sp. N. glauca L. Curtis, 10. 
Cylindric-oval ; fore tarsi 3-jointed ; hind tibiz without ungues. (My fig. 119.1.) 
PLOA Steph. Putra Leach. 1 sp. WN. minutissima Foure. Pz. 2. 12. 
Ovate-quadrate ; fore tarsi 3-jointed, hind tarsi with ungues. 
SIGARA Leach. Notonrecra L. 1 sp. N. minutissima L. 
Anterior tarsi 1-jointed ; scutellum distinct. 
CORIXA Geoffr. Stcara p. Fab. 10sp. WN. striata Linn. Donov. pl. 176. 
Anterior tarsi 1-jointed ; scutellum not distinct. 
Family 2. NEPIDZ Leach. 
NAUCORIS Geoffr. Nera p. Linn. Isp. N. Cimicoides L. Don. pl. 381. 
Body oval, depressed, without anal sete. 
NEPA Linn. Hepa p. Geoffr. 1sp. N. cinerea L. Curtis, 700. 
Body broad, flat, with too long anal sete. (My fig. 119. 10.) 
RANATRA Fabr. Neva p. Linn. 1sp. N. linearis L. Curtis, 281. 
Body linear, with two long anal sete. 
Sect. II. Aurocorisa Westw. (Geoocorisa Latr.) 
Family 1. (or 3.) GULGULIDZ. 
(There is no British species in this family. ) 
Family 2. (or 4.) ACANTHIIDZE Leach. (Riparii Burm.) 
APHELOCHEIRUS Westw. Navcorisp. Auct. 1 sp. N. estivalis Fab. 
Antenne very short ; hind legs natatorial. My frontispiece, Vol. I. fig. 7. 
ACANTHIA Latr. Satpa Fabr. 10 sp. Ci. saltatoria Linn. My fig. 120. 10. 
Antenne of moderate size; legs formed for running. Curtis, 548. 
Family 3. (or 5.) HY DROMETRIDZ Leach. (Ploteres Latr. 
Hydrodromici Burm. Amphi,. orises L. Dufour.) 
Latr. 1796., nee Fab. S. Rh. 
Limnopates Burm. Isp. C. Stagnorum L. 
HYDROMETRA { 
Linear, first and second joints of antennz short, third longest; legs formed for 
walking. Curtis, 32. (My fig. 120. 6.) 
VELIA Latr. Hypromerra p. Fab. 1sp. C. RivulorumL. Curtis, 2. 
Basal joint of antenne longest ; legs moderate, placed at equal distances apart 
formed for rowing. 
MICROVELIA Westw. Uyprozssa Burm. 1 sp. V. pygmea Duf. 
Last joint of antennz longest, intermediate joints short; legs of equal length, 
short; thighs simple. Curtis, 681. 
GERRIS Fab. 1794. Hyprometra Burm. & Fab. S. R. 6 sp. C. lacustris L. 
Basal joint of antenne longest ; four hind legs very long, at a great distance from 
the fore legs. Curtis, 553. (My fig. 120. 2.) 
HEBRUS Walk. Lyca#us p. Fall. 1 sp. Lyg. pusillus Fall. 
Ovate, depressed ; ocelli two; hind legs curved; tarsal ungues apical; scutellum 
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