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LIST OF ILLUSTRATIONS. 



PLATES. 



Facing page 



I. Types of color pattern in Polistes varieties. 12 



II. Development of color pattern in Polistes 16 



III. Species of Polistes 32 



IV. Species of Polistes 42 



V. Map of the United States illustrating distribution of Polistes 53 



VI. Map of the world illustrating parallelism in distribution of Polistes 



in America and Eurasia 69 



TEXT FIGURES. 



Page 



FIG. i . Dorsal view of Polistes pallipes 10 



2. Lateral view of P pallipes 10 



3. Front view of head of female of P. pallipes 10 



4. Middle leg of P. pallipes 10 



5. Cross-section through cuticle of P. pallipes n 



6. Cross-section through portion of cuticle, mesothorax of pupa of P, 



pallipes ii 



7. Diagrammatic representation of relations of types of color pattern for 



the abdomen of Polistes varieties 13 



8. Diagrammatic representation of proportion of males to females in 



types of color pattern found in collections of southeastern Wis- 

 consin 16 



9. Distribution by nests in general scheme of representation for types. . 18 



10. Condition of males from southeastern Wisconsin with reference to 



ventral abdominal markings 23 



11. Condition of females from southeastern Wisconsin with reference to 



ventral abdominal markings 24 



12. Correlation between markings of ventral and dorsal surfaces of ab- 



domen of female '. 26 



13. Correlation between markings of -dorsal and ventral surfaces of ab- 



domen of male 26 



14. Correlation between character of abdomen and width of median stripes 



of metathorax 28 



15. Correlation between dorsal surface of abdomen and size of lateral 



stripe of metathorax. L,ots same as in foregoing determinations. . 28 

 16 Correlation between size of metameric spot and width of terminal 



border of second abdominal segment 29 



17. Correlation between amount of yellow in abdomen and that in clypeus 



of female 29 



18. Relation between latitude and melanism, second abdominal segment 



taken as measure of melanism 54 



19. Correlation between pigmentation of second abdominal segment and 



that of metathorax 57 



