With but few exceptions, all the Hemiptera are parasites of the vegetable kingdom. There are only very few which attack animals. There is one species, the name of which may be readily guessed (_Acanthia lectularia_), which pursues us relentlessly everywhere, for it will wait for months and years, always equally greedy of our blood. It surprises us during the night, and does not wait till its digestion is complete before it attacks us again. Happily for us, another hemipterous insect, the masked reduvius (_Reduvius personatus_) penetrates like the preceding one into our apartments, and covers 268 itself with dust, in order the more readily to fall upon its enemy; but man is not sufficiently acquainted with its habits, to make war in common with it on this miserable parasite. We ought for this purpose to place the masked reduvius under the protection of the law, to collect the various kinds together, and to offer premiums for the most vigorous races. INDEX. 269 Acanthia lectularia, 267 Acaridæ, 130 ---- of reptiles, 135 ---- insects, 135 ---- molluscs, 136 Acarus, itch, 131 ---- eruditus, 137 ---- marginatus, 134 Actinia carcinopodus, 63 Adamsia, 26 Agamonema, 234 Alardus caudatus, 45 Albertia, 35, 78 Alciopina, 47 Alcyonium domuncula, 27 Alepas on Spinax niger, 58 Allotria victrix, 172 Amphinoma, 43 Amphistomum sub-clavatum, 203 Ampularia and Sphærium, 40 Ancei, 72 Anelasma squalicola, 58 Anemone of Chinese sea, 7 ---- and Pyades, 26 Angler (fishing frog), 33 Anguillula macroura, 248 ---- scandens, 181 Anguillulina, 182 Anilocra, 29 Anodonts, young, 39 Anoplodium parasita, 46 Apterychtus ocellatus, 6 Arcturus Baffini, 41 Argas chinche, 133 ---- Persian, 133 ---- reflexus, 143 ---- Americanus, 134 Arguli, 34, 72 Arius bookei, 8 Ascaracantha tenuis, 250 Ascaris acus, 241 ---- inflexa, 237 ---- lumbricoides, 95 ---- megalocephala, 241 ---- nigro-venosa, 157 ---- vesicularis, 237 Ascaroides limacis, 83 Asellus medusæ (Dalyell), 21 Asilus crabroniformis, 121 Astacobdella, 81 Asterachæres Lilljeborgii, 152 Asteromorpha lævis, 48 Atax, 136 Axinella, 66 Balanidæ on Matamata, 58 Balatro calvus, 35 Baudroie (angler), 33 Bdellura, 46 Bernard the Hermit, 23 Berne, 120 Bilharzia, 105 Birgus, 25 Black-flies, 116 Bonellia (male), 139 Bopyrus, 32, 144 Bothriocephalus latus, 105 Brachycera, 115 Bracon iniator, 168 Branchellions, 113 Bryozoa, 41 Bugs, 124 ---- of Miona, 133