ILLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Argentine ants upon a tea table Frontispiece. 



II. A small colony of Argentine ants as seen in one of the artificial for- 

 micaries 32 



III. "Formicarium," or special insectary, constructed and equipped for 



the study of the Argentine ant 36 



IV. Immature stages of the Argentine ant 40 



V. Wet- weather nest or shed, erected by Argentine ants during rainy 



weather 56 



VI. Orange tree after exposure to Argentine ants for three seasons 64 



VII. Beehive on ant-proof hive stand, the latter resting upon a concrete 



block 88 



VIII. Orange orchard dying as a result of infestation by the Argentine ant. 92 

 IX. Batture of the Mississippi River 50 miles below New Orleans, over- 

 grown with willows and heavily infested by the Argentine ant 92 



X. Siphon, pumping plant, and barrier ditch used in Limiting the spread 



of the Argentine ant 92 



XI. Bridges wliich the Argentine ant can not cross 92 



XII. Trajj box and fumigating cover for destruction of Argentine ant 



while in winter quarters 96 



XIII. Orange grove in which campaign was waged against the Argentine 



ant — appearance of the grove after recovery 96 



TEXT FIGURES. 



Fig. 1. Map of Alabama, Mississippi, and Louisiana, showing counties in the 



Southern States wMch are infested by the Argentine ant 14 



2. Distribution of the Argentine ant in California 16 



3. Injury to the stand of sugar cane by the sugar-cane mealy-bug 



{Pseudococcus calceolarix) , wMch is attended by the Argentine ant.. 24 



4. Sugar-cane mealy-bugs on sugar cane 25 



5. Covering constructed by the Argentine ant to protect the mealy-bugs. . 26 



6. The Argentine ant, adult forms 28 



7. Artificial formicary or cage used in studying the Argentine ant 33 



8. Artificial formicary with parts assembled ready for use 34 



9. Entrance of artificial formicary shown in figures 7 and 8 35 



10. Argentine ant removing jjupa of sorghum midge from a head of sorghum . 70 



11. Ant-proof hive stand, upturned, showing method of construction 90 



12. Ant-proof hive stand , sectional view 91 



13. Ant-jjroof liive stand, from above, showing construction 92 



7 



