LIST OF SPECIES STUDIED. 



PAGE PLATE 



Cyclops ater 5 I 



C. signatus, coronatus— Koch. C. fuscus — Jurine 8 II, III 



C. signatus annulicornis, C. albidus — Jurine lo IV 



C. Americanus — Marsh. C. insectus — Forhks 13 V 



C. parous — Hekrick 14 VI, XI 



C. brevispinosus — Herrick ^ 16 V, VII 



C. ingens— Herrick ? 22 VIII 



C. virido-signatus, n. sp 23 IX 



C. pulchellus — Herrick 24 X 



C. bicuspidatus — Forbes 25 X 



C. modestus — Herrick 26 XI 



C. serrulatus — Forbes 27 XII 



C. fluviatilis— Herrick 28 XV 



C. bicolor— Sars 29 XIII 



C. phaleratus— Koch 31 XIV 



C. fimbriatus— Fischer 33 XV 



