Diphadnus Hartig 76 



Pristiphora Latreille 77 



Species of Pristiphora 77 



Micronematus Konow 79 



Lygaeonematus Konow 81 



Pachynematus Konow 81 



Species of Pachjoiematus 82 



Nematus Panzer 82 



Sj)ecies of Nematus 83 



Croesus Leach 83 



Amauronematus Konow 84 



Species of Amauronematus 84 



Pteronidea Rohwer 85 



Species of Pteronidea 85 



Pontania Costa 88 



Species of Pontania 88 



Subfamily Blennocampinae 91 



Genera of Blennocampinae 92 



Tomostethus Konow 92 



Blennocampa Hartig 93 



Erythraspides Ashmead 94 



Monophadnus Hartig 94 



Hypergyricus MacGillivray 94 



Species of H>'pergyricus 94 



Monophadnoides Ashmead 95 



Isodyctium Ashmead 95 



Subfaroily Fenusinae 96 



Genera of Fenusinae 96 



Kaliofenusa MacGillivray 97 



Fenusa Leach 97 



Subfamily Scolioneurinae 98 



Metallus Forbes 98 



Species of Metallus 99 



Subfamily Hylotominae 99 



Hylotoma Latreille 100 



Species of Hylotoma 100 



Subfamily Schizocerinae 101 



Schizocerus Lepeletier 102 



Subfamily Acordulecerinae 103 



Acordulecera Say 103 



Species of Acordulecera 103 



Family Pamphiliidae 104 



Species of Pamphiliidae 105 



Family Cephidae 108 



Genera of Cephidae 109 



Janus Stephens 110 



Species of Janus 110 



Adirus Konow 1 10 



Trachelus Jurine Ill 



Cephus Latreille Ill 



Species of Cephus Ill 



Hartigia Schiodte 112 



Family Xiphydriidae 112 



Xiphydria Fallen 113 



Family Siricidae 114 



Tremex Jurine 115 



Family Megalodontidae 116 



Family Oryssidae 117 



Oryssus Latreille 118 



IV. Phylogeny 120 



V, Summary 133 



VI. BibUography 135 



Vn. Explanation of Plates 141 



VIII. Index 169 



