LIST OF PLATES. xii 
Plate. Fig. | Page. Plate. Fig. | Page. 
Mesovelia mulsanti, ¢ .............. VIII. | 10 | 123 
Qo veveeee een ee eene sees VI. | 11 | 123 Repovux. 
Westermannia annulata ............ X. 7 | 164 
difficilis ...... 0.0... 0... eee 
HYDROMETRIDE. . Ploiariodes armata.................. x 5 ies 
Microvelia flavipes, Q .........0.005 VIII. | 12 | 127 || Lutevopsis longimanus, d............ X. 10 | 166 
paludicola, 20 .........-.0 008. VII. | 18 | 127 ornata, Sw... ee eee eee X. 11 | 166 
panamensis, ¢ ........ cece eee VIII. | 14 128 Gardena americana, ¢ .............. X. 12 167 
—— torquata, So we... eee e eee eee eee VILL. | 15 128 Emesa longipes ................000. X. 13, 14] 168 
—— circumeincta, 9 .............. VIII. | 16 129 Ghilianella ignorata, g .............. X. 15 170 
—— albonotata, d ...... cece eee ee VIIl. 17 129 » Qc cc enw e cee eens X. 16 170 
— rufescens .........002 00 ceeeee VIII. | 18 | 130 bulbifera, do... 0... eee X. 17/171 
setipes, So... . cee ee cece eee eee VIIT. | 19 | 180 |} —— DQ cece ccc ee cece ee eees X. 18 | 171 
Rhagovelia crassipes, ¢ «..... ee VIII. | 20 | 133 granulata ...............0.05, X. 19 | 171 
Oe + VIII. | 21 133 gibbiventris, d...........2000. X. 90 172 
varipes, do... eee ee eee ee eee VIIL. | 22 133 Luteva macrophthalma .............. X. 24 173 
femoralis, ¢ ........ 0. eee eee VIII. | 23 | 134 | Ploiariopsis megalops............... ‘|X. 91 | 174 
armata, Qo... cece eee eee ees VIII. | 24 | 185 predator .......... 02.0.0. 00 X. 29 | 174 
distincta, Oo... cee eee eee eee VIII. | 25 135 Ploiaria, sp. 6... cc ce eee ee eee X. 93 175 
— Oa VIII. (26,27) 135 || Bactrodes biannulatus, g ............ XL ] 175 
spinigera, Q ............ eee eee VIII. | 28 137 spinulosus, Q ....... 2... eee XL 9 176 
tenuipes, G ... ec eee eee eee eee VIII. | 29 | 137 | Saica rubripes, 6 ...... 2... eee ee XI. 3 1177 
—- a VII 30 | 137 tibialis, 9.02... . ee eee XI. 4 | 178 
uncinata, So... cece eee ee eens IX. 1 138 erubescens, ¢ ......... cee eee XI. 5 178 
—— QD cece cere cece tenes IX. 2 | 188 | Tagalis inornata, d ..............0. XL. 6 | 179 
inmsularis, G wwe. ee eee eee IX. 3 139 seminigra, Qo... . kee eee XL 7 179 
Trochopus salinus, g ...........-..5: IX. 4 | 140 | Oncerotrachelus acuminatus, 29 ...... XL. 8 | 180 
9 Qe cece erence ee ences 1X. 5 140 | Chryxus tomentosus, ¢ ............ XI. 9 181 
Velia brachialis, ¢ «0.2... eee ee eee IX. 6 141 Pnirontis spinimanus, 9 ............ XI. 10 182 
Oa IX. 7 | 141 infirma, So ww... eee eee XI. {11 | 183 
annulipes, J ...... cee ee ee eee IX. 8 | 142 | —— ee XI. 12 | 183 
cinctipes, S 6.6... ee eee eee IX. 9 | 148 languida, ¢ ..............-0.. XL. 13 | 183 
Gerris mexicanus, d ............6-.- 1X. 10 | 147 | Pygolampis spurca, ¢ .............. XI. 14 | 183 
cariniventris, ¢  ........-2-54. IX. Il | 148 1D cece ec ee cece caeees XI. 15 | 183 
— Oa IX. 12 | 148 | Gnathobleda fraudulenta, 9 .......... XI. 16 | 184 
flavolineatus, d  ..........008. IX. 13 | 149 litigiosa, Skee ee eee XL. 17. | 184 
9 Qe cece cece eee ee eens IX. /|14,15} 149 || Schumannia mexicana, g ............ XL 18 | 185 
Limnometra opaca, ¢ «wwe eee eee IX. 16 150 Apronius octonotatus, ¢ ............ XL 292 186 
quadrilineata, 9 .............. IX. 17 151 Narvesus carolinensis, Q ............ XL 19 188 
Limnogonus hyalinus, ¢ ............ IX. 18 153 Diaditus hirticornis, Sve ececneaee. XI. 920 189 
Brachymetra albinervus, ¢ .......... IX. 19 153 pictipes, So... eee eee XI. 21 189 
Potamobates unidentatus, ¢.......... IX. (| 20 155 Salyavata variegata, ¢ ..........000. XL. 25 190 
a IX. 21 155 || Nalata quadrituberculata, d.......... XI. 23 | 191 
bidentatus, G ..i... ee eee eee IX. 22 155 nigrescens, De cee eee ee eee XL 94 192 
Platygerris depressus, ¢ ............ IX. 23 156 lrrorata, Go... ee ee eee eee ee XL. 26 192 
a IX. 24 | 156 Spinicollis, 9* ..,............. XL. 27 193 
ceruleus, Q .......- eee eee IX. 25 157 rudis, °) eee eee eee XIL. 1 193 
Trepobatopsis denticornis, g ........ IX. 26 | 158 fuscipennis, ¢ ................ XII. 2 | 194 
setulosa, 3 ui Lee e eee eee -- XII. 3 194 
Hextcocermanins, ein wevreec | ae | é fae 
Henicocephalus concolor ............ X. 1 160 || Aradomorpha crassipes, See e ce eaae XII. 8 | 196 
annulipes .........eee eee eaee X. 2 160 || Allceocranum biannulipes, re XII. 6 197 
—— pilosus ......-.- eee eee eee eeee X. 3 160 Leogorrus formicarius, ¢ ............ XII. 11 198 
emarginatus ................-. X. 4 | 161 litura, Q ...... ee eee XII. 7 | 199 
angustatus........-....e eee X. 5 161 venator, Qo... eee eee eee eee XII. 9 200 
CuliciSs 2... eee eee eee eee X. 6 | 162 longiceps, 9 .................. XIT. | 10 | 200 
* Wrongly marked g on the Plate. 
