HEMIPTERA HETEROPTERA. 
163 
Fam. 3. GERRID^. 
GerridjB, Serv. Hist. Hem. 418 — Hydrobatida, Stal, Hem. Afr. iii. 168 — 
Hydrotnelrae, Fieb. Eur. Hem . — Hydrometrida, Dougl. and Scott, 
Hem. 40. 
A. Fore tibia with a distinct apical tooth. 
a. Abdomen very short. - - - - 3. Haloba.te8. 
b. Abdomen almost as long as the thorax. - - 2. Ptilomera. 
B. Fore tibia with no distinct apical tooth. - - 1. Gerris. 
Genus 1. GERRIS. 
Gerris, Lair, Gen. iii. 133. Sckum. JBeitr. 11. Serv, Hist. Hem. 414— ‘ 
Hydrometra, Fabr. Syst. Rhyn.256. Barm. Ramb. Fieb. Eur . 
Hem. 106. Dougl. and Scott, Hem. 557 — Tenagogonus, Stal, Ofv. 
K. V. Ak. Fork. X. 263; Hem. Afr. iii. 168 — Limnoporus, Stal, Ofv. 
K. V. Ak. Fork. xxvi. 398 — Limnogonus, Stal, Ofv. K. V. Ak. Fork. 
vii. 132 — Linanotrechus, Stal, Ofv. K. V. Ak.Forh. xxv. 398 — Hygro- 
trechus, Stal, Ofv. K. V. Ak. Fork. xxv. 398. 
Europe. 
1. Gerris ruposcotellata. 
, Stoll, Pun. pi. 15, f. 108 — Gerris rufoscutellata, Latr. Gen. iii. 134. 
Schum. Plot. pi. 3, f. 1, 2 ; pi. 4, f. 1, 14 — 19 — Hydrometra lacustris, 
Fall. Hem. 159 — Hydrometra rufoscutellata, H.-Sch. Wanz, Ins. ix. 
69, pi. 300, f. 924. Fieb, Eur. Hem, 106 — Limnoporus rufoscutellalus, 
Stal. 
Europe. 
2. Gerris paludum. 
Gerris paludum, Fabr. Ent. Syst. iv. 188. Schum. Beitr. Plot. 29, pi. 4, 
f. 5 — 13. Brull. Hist. Nat. Ins. ix. 302. Blanch. Hist. Nat. Ins, 
iii. 97. Serv. Hist. Hem. 417 — Hydrometra paludum, Fabr. Syst. 
Rhyn. 258. Zett. Ins. Lapp. 281. H.-Sch. Wanz. Ins. ix. 67, p], 300, 
f. 926. Bunn. Handb. Ent. ii. 210. Fieb. Eur. Hem. 106. Flor, 
Rhyn. Liv. i. 732. Dougl. and Scott, Hem. 559 — Hygrotrechus 
paludum, Stal. 
a — n. England. 
0 , p. South France. 
3. Gerris Najus. 
Cimex Najus, Deg. Ins. iii. 311, pi. 16, f. 8,9 — Gerris aptera, Wimm. 
Schuml. Plot. 34, pi. 4, f. 4, 20 — 24 — Gerris canalium, L. Duf. Reck. 
Hem. 69, pi. 5, f. 59. H.-Sch. Wanz. Ins. pi. 300, f. 925, K, L, M. 
Serv. Hist. Hem. 418 — Hydrometra aptera, H.-Sch. Wanz. Ins. ix. 
69, pi. 300, f. 925 — Hydrometra Najus, Fieb. Eur. Hem. 107, Dougl. 
and Scott, Hem. 560 — Hygrotrechus Najus, Stal. 
a, b. France. 
