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. "Formiearium," 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 which the Argentine ant can not cross 92 
XII. Trap 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 4 
ant — appearance of the grove after recovery 96 
TEXT FIGURES. 
Fig. 1. Map of Alabama, Mississippi, and Louisiana, showing counties in the 
Southern States which 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 calceolarise) , which 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 pupa 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-proof hive stand, from above, showing construction 92 
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