CONTENTS, 



Page. 



Introduction 7 



Characters of the group 7 



Generic sjTionymy 11 



Unrecognizable species and synonyms 12 



Table of genera 14 



Table of larvas 14 



Table of pupae 15 



Prosimulium Roubaud 15 



Generic characters. Table of species 16 



Prosimulium pleurale, new species 17 



Prosimulium fulvum Coquillett 18 



Prosimulium hirtipes Fries 18 



Prosimulium mutatum, new species 20 



Prosimulium pccuarum Riley 21 



Parasimulium, new genus 24 



Parasimulium furcatum, new species 24 



Simulium Latreille 25 



Table of males 25 



Species groups in Simulium Latreille (females) 26 



Group A. Table of species 26 



Simulium aureopunctatum, new species 27 



Simulium hippovorum, new species 28 



Group B. Table of species 29 



Simulium trivittatum, new species ' 30 



Simulium distinctum Malloch 30 



Simulium ochraceum Walker 30 



Simulium bivittatum, new species 31 



Simulium notatum Adams 32 



Group C. Table of species 34 



Simulium mexicanum Bellardi 35 



Simulium pamassum, new species 36 



Simulium arcticum, new species 37 



Simulium bracteatum Coquillett 38 



Simulium exiguum Roubaud 39 



Simulium clavipes, new species 40 



Simulium jenningsi, new species 41 



Simulium venustum Say 43 



Simulium piscicidiuvi Riley 45 



Simulium tarsale Williston 46 



6 



