164 CATALOGUE OF 
4, GERRIS VENTRALIS. 
Hydrometra ventralis, Fieb. Hur. Hem. 107 — Hygrotrechus ventralis, 
Stal. 
Greece. 
5. Gerris Coste. 
Hydrometra Coste, H.-Sch. Wanz. Ins. ix. 71, p]. 300, f. 927. Fieb. Eur. 
Hem. 107— Hydrometra rufoscutellata, Costa, Cent. ii. pl. 2, f. 8— 
Limnotrechus Coste, Stal. 
Middle and South Europe. 
6. GERRIS THORACICA. 
Gerris thoracica, Schum. Beitr. ii. 46. H.-Sch. Nom. Ent. 63—Gerris rufo- 
scutellata, Curt. Brit. Eat. xii. 553—Hydrometra thoracica, H.-Sch. 
Wanz. Ins, ix. 67, pl. 301, f.928. Flor. Rhyn, Liv. i.739. Fieb. Eur. 
Hem.108. Dougl. and Scott, Hem. 562—Limuotrechus thoracicus, 
Stal, 
a, 6. France. 
7. GERRIS LATERALIS. 
Gerris lateralis, Schum. Plot. 39, pl. 3, f. 12; pl. 13—15— Hydrometra 
lateralis, Fieb. Hur. Hem. 108. H.-Sch. Wanz. Ins. ix. 74, pl. 2, f. 9 
—Limnotrechus lateralis, Stal. 
Germany. 
8. GERRIS ASPERA. 
Hydrometra aspera, Lieb, Eur. Hem. 108—Limnotrechus asper, Stal. 
Bohemia. Galicia. 
9. GERRIS GIBBIFERA. 
Gerris gibbifera, Schum. Beitr. ii. 41, pl. 3, f. 5—7— Hydrometra gibbi- 
fera, H.-Sch. Wanz. Ins. ix. 72, pl. 301, f.929. Fieb, Eur, Hem, 108. 
Dougl. and Scott, Hem. 564—Limnotrechus gibbifer, Stal. 
Europe. 
10. GERRIS LACUSTRIS. 
, Geoffr. Ins. i. 463. Stoll, Pun. 42, pl. 9, £.63. Deg. Ins. 
iii. 311—Cimex lacustris, Linn. Faun. Suec. 970; Syst. Nat. 2732. 
Tign. Hist. Nat. Ins. iv. 283—Hydrometra lacustris, Fabr. Syst. Rhyn. 
256. H.-Sch. Wanz. Ins. ix. 73, pl.301, £.930. Burm. Handb. Ent. 
ii. 210. Flor. Rhyn. Liv. i. 742. Ramb. Faun. And. ii. 185. Fieb. 
Eur. Hem. 109. Dougl. and Scott, Hem. 566—Gerris lacustris, Latr. 
Gen. iii. 134. Schum. Beitr. ii. 43, pl. 3, f. 11. Blanch, Hist. Nat. 
Ins. iii. 98; Hem. pl.1, f.6. Serv, Hist, Hem. 417—Gerris variabilis, 
Curt. Brit. Hint. xii. 553, 
a, b. France. 
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