164 
CATALOGUE OF 
4. Gerris ventralis. 
Hydrometra ventralis, Fieb. Ear. Hem. 107 — Hygrotrechus ventralis, 
Stal. 
Greece. 
5. Gerris Cost.e. 
Hydrometra Gostse, H.-Scli, Wanz. Ins. ix. 71, pi. 300, f. 927. Fieb. Ear. 
Hem. 107 — Hydrometra rufoscutellata, Costa, Cent. ii. pi. 2, f. 8 — 
Limnotrechus Costae, Slal. 
Middle and South Europe. 
6. Gerris thoracica. 
Gerris thoracica, Schum. Beitr. ii. 46. H.-Sch. Horn.' Enl. 63 — Gerris rufo- 
scutellata, Curl. Brit. Ent. xii. 553 — Hydrometra thoracica, H.-Sch. 
Wanz. Ins. ix. 67, pi. 301, f. 928. F/or. IVvjn. Liv. i. 739. Fieb. Eur. 
Hem, 108. Dougl. and Scott, Hem. 562 — Limnotrechus thoracicus, 
Stal. 
a, b. France. 
7. Gerris lateralis. 
Gerris lateralis, Schum. Plot. 39, pi. 3, f. 12; pi. 13 — 15 — Hydrometr 
lateralis, Fieb. Eur. Hem. 108. H.-Sch. Wanz. Ins. ix. 74, pi. 2, f. 
— Limnotrechus lateralis, Stal. 
Germany. 
8. Gerris aspera. 
Hydrometra aspera, Fieb. Eur. Hem. 108 — Limnotrechus asper, Stal. 
Bohemia. Galicia. 
9. Gerris gibbifera. 
Gerris gibbifera, Schum. Beitr. ii. 41, pi. 3, f. 5 — 7 — Hydrometra gibbi- 
fera, H.-Sch. Wanz. Ins. ix. 72, pi. 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, pi. 9, f. 63. Deg. Ins. 
iii. 311 — Cimex lacustris, Linn. Faun. Suec. 970; Syst. Nat. 2732. 
Tign. Hist. Nat. Ins. iv. 283— Hydrometra lacustris, Fabr. Sgsi. Rhyn. 
256. H.-Sch. Wanz. Ins. ix. 73, pi. 301 , f. 930. Bunn. Handb. Ent. 
ii. 210. Flor. Rhyn. Liv. i. 742. Rnmb. Faun. And. ii. 185. Fieb. 
Eur. Hem. 109. Dougl. and Scott, /Lem. 566— Gerris lacustris, Latr. 
Gen. iii. 134. Schum. Beitr. ii.43, pi. 3, f. 11. Blanch. Hist. Nat. 
Ins. iii. 98 ; Hem. pi. 1 , f. 6. Serv. Hist. Hem. 417 — Gerris variabilis, 
Curt. Brit. Ent. xii. 5.53. 
a, b. France. 
Ci 
