TABLE OF CO.NTEiNTS 



Page 



Introduction vii 



Part 1. Biology of the Mutillid wasps 1 



Early suppositions regarding the habits of Mutillids 3 



Observations establishing the parasitic role of the Mutillids_ 4 



Life history of Methoca ichneumon ides Latreille 



Hosts of the Mutillidae 10 



Typical life history of a Mutillid wasp 13 



Effect of environmental factors on individuals of the same 



species 14 



Economic importance 19 



Effect of temperature on the activity of Mutillids 25 



Sound-producing organs 26 



Gynandromorphism 27 



Part 2. Type species of the genera of the family Mutillidae 29 



List of generic names 29 



Part 3. Monograph of the Mutillid wasps of the genus Dasymutilla occur- 

 ring in America, north of Mexico 39 



Introduction 39 



Biology 39 



Specific characters 40 



Classification, 41 



History and diagnosis of genus 42 



Key to species (females) 45 



Key to species (males) 51 



Discussion of species 56 



Part 4. Annotated bibliography 305 



Explanation of plates 339 



Index 341 



V 



