Contents 



Page 



Introduction v 



Definition of subfamilies 3 



Subfamily Ephialtinae 4 



Key to the tribes of Ephialtinae 5 



1. Tribe Pimplini 6 



Key to the Nearctic genera of Pimplini 8 



1. Genus Exeristes 10 



2. Genus Scambus 15 



Keys to the subgenera of Scambus 16 



Subgenus Endromopoda 18 



Subgenus Lissoscambus 25 



Subgenus Aleleophadnus 27 



Subgenus Scambus 36 



Subgenus Erythroscarnbus 76 



3. Genus Calliephialtes 80 



4. Genus Apistephialtes 87 



5. Genus Pimpla 100 



6. Genus Anastelgis 109 



7. Genus Dolichomitus Ill 



8. Genus Acropimpla 159 



9. Genus Iseropus 165 



10. Genus Tromatobia 174 



11. Genus Zaglyptus 188 



12. Genus Clisiopyga 195 



13. Genus Alophosternum 206 



14. Genus Perithous 209 



2. Tribe Polysphinctini 216 



Key to the Nearctic genera of Pobysphinctini 219 



1. Genus Laufeia 220 



2. Genus Schizopyga 224 



3. Genus Zabrachypus 228 



4. Genus Acrodactyla 230 



5. Genus Eruga 238 



6. Genus Piogasler 241 



7. Genus Oxyrrhexis 242 



8. Genus Polysphincta 245 



9. Genus Acrotaphus 256 



10. Genus Sinarachna 258 



11. Genus Zatypota 262 



3. Tribe Ephialtini 280 



Key to the Nearctic genera of Ephialtini 281 



1. Genus Itopleclis 281 



2. Genus Ephialtes 302 



3. Genus Coccygomimus 311 



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