410 
ZOOLOGICAL LITERATURE. 
certain Fabrician species of this family : — Velia rivulorum and Ilydrometra 
aptei'a are well known to be identical ; Hydrometra ahhreviata is described 
from the larva of Limnotrechua lateralis or asper ; Hyd. cursitans and Jluvio- 
rum belong to Limnometra (Mayr) ; H. hyalinus and fossarum are referred 
to a new genus, Limnogonua> 
Stal ((Efvers. Kongl. Vet.-Akad. Fork. 1808, pp. 395-898) publishes a 
synopsis of the Swedish species of this family, of which ho recognizes 7, 
divided by him into the following genera: — 
A 
1. Antennae more than half as long as the body, slender ; posterior tibiae and 
tarsi together much longer than intermediate tibiae 
1. Limnoporus (StSl). 
IT. Antennae not longer than head and thorax together ; posterior tibiae and 
tarsi together but little longer than intermediate tibiae. 
A. Joint 1 of antennae longer than 2 & 3 together, 2 & 4 of equal length, 
each a little longer than 3 2. Ilyyrotrechus (StSl). 
B. Joint 1 of antennae subequal to 2 & 3 together, or rather shorter, 
4 longe rthan 3 3. Limnotrechua 
The species referred to these genera are the following : — To Limnoporus ^ 
Gerris rufoacutellata {ludii.')~laeustris (Fall.); to Ilyyrotrechus, Cimex najas 
(De (j(.) — aptera (Schum.) and also Hydr. paludum (Fab.) and ventralis 
(Fieb.) ; and to lAmnotrcchus, Gerris thoracica {^c\i\x\\\.) = thoracica (Flor.), 
llydr. aspera (Fab.), Cimex lacustris (Linn.), llydr. odontoyaster (Zett.), and 
Gerris aryentata (Schum.), and also Hydr. costce (Il.-Sch.), lateralis (Schum.), 
yihhifera (Schum.), and servillei (Frei-Gesn.). 
Limnoyonus, g. n., StSl, 1. c. p. 132. Allied to Limnometra ; anterior tarsi 
with joint 1 scarcely more than half the length of 2 ; apical angles of last 
abdominal segment not spinous. Sp. Hyd. hyalina and fossarum (Fab.) ; 
Gerris discolor, parmla, franciscana (StSl). 
GALGULIDiE. 
Naucoris ocidata (Fab.) = 6a/u (Il.-Sch.), St.*l, Kongl. Svcnslca 
Vet.-Akad. llandl. vii. p. 133. 
Nepid^. 
Stal (Kongl. Svenska Vet.-Akad. Handl. vii. pp. 134-136) identifies the 
following Fabrician species: — Naucoris nepceformis is CiMonomyx and =rap- 
torius =ihipunctatus (Stfil) ; N. raptoria is also a Monomyx=raninus 
(H.-Sch.)=/wsco-consj^emfs (StSl) ; N.nepoides is wa Appasus, and = natator 
(Am. & Serv.)= (StSl) ; Nep>a yrossa (f>.'R.) = Laccotrep)hea yrossus 
(Stul olim) changed to L. fahricii (1. c. p. 134); N grossa (E. S.) = Z/«cco- 
trephes) ruher (Linn.) ; N. nigra and macxdata belong to Laccotrephes, and the 
latter=iV. grisea (Guer.) j Manatra fUformis and elonyata remain in the 
genus Ranatra. 
Notonectid^. 
Stal (Kongl. Svenska Vet.-Akad. Handl. vii. pp. 136-138) identifies the 
following Fabrician species : — N. marmorea is a var. of N. ylauca (IJnn.) ; 
N. indica belongs to Enithares ; N. ciliata and p)allipes belong to Anisops, 
and perhaps respectively and jdatycnemis (Fieb.) ; Siyara coleo- 
ptrata, niyripennis, and hyalinipcnnis belong to Corixa. 
