Contents 



Page 



Introduction v 



Acknowledgments vi 



Subfamily Gelinae 3 



Key to the tribes of Gelinae 4 



Tribe Gelini 4 



Tribe Hemigasterini 6 



Tribe Mesostenini 7 



Biology 7 



Generic Groupings 9 



New nomenclature for genotypes 16 



Faunal relations 17 



Key to the subtribes of Mesostenini 20 



1. Subtribe Baryceratina 21 



Key to the Nearctic genera of Baryceratina 22 



1. Genus Whymperia 22 



2. Genus Baryceros 23 



2. Subtribe Mesostenina 32 



Key to the Nearctic genera of Mesostenina 33 



1. Genus Apsilops 37 



2. Genus Agrothereutes 42 



3. Genus Gambrus 70 



4. Genus Mallochia 93 



5. Genus Aritranis 98 



6. Genus Pycnocryptus 126 



7. Genus Ischnus 131 



8. Genus Habrocryptoides 165 



9. Genus Trachysphyrus 177 



10. Genus Chromocryptus 256 



11. Genus Lanugo 259 



12. Genus Reptatrix 276 



13. Genus Compsocryptus 278 



14. Genus Joppidium 306 



15. Genus Hidryta 318 



16. Genus Idiolispa 322 



17. Genus Trychosis 333 



18. Genus Hemisphragia 378 



19. Genus Diapetimorpha 380 



20. Genus Lymeon 393 



21. Genus Pachysomoides 398 



22. Genus Acerastes 403 



23. Genus Polycyrtidea 405 



24. Genus Listrognathus 407 



25. Genus Cryptanura 426 



26. Genus Chamula 430 



27. Genus Camera 432 



28. Genus Mesostenus ; . . 434 



29. Genus Polycyrtus 459 



III 



