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Plate XXVI

Fig. 1. Nest of a harvesting ant (Messor species) in the Athi Plains, British East Africa, July, 19C6.

Fig. 2. Bushes of a species of Acacia with galls on the swollen thorns, often inhabited by ants. Athi Plains, British East Africa, July, 19C6.

Fig. 3. Species of Acacia with galls on the thorns inhabited by ants. Near the Tana River, 25 miles below Fort Hall, British East Africa, September, 1910.

Photograph by Mr. Carl E. Akeley

[graphic]

Plate XXVII

Fig. 1. Scaphopetalum Thonneri De Wildeman and Durand. Niapu, January 1, 1914. Extremity of a branch with ant inhabited pouches at the base of the leafblade. The five leaves still attached are seen from above; the two detached (lower part of photograph) show the under side with slit leading into the pouch; between them is a longitudinal section of one of the ascidia.

Fig. 2. Cola Laurentii De Wildeman. Stanleyville, March, 1915. Extremity of a branch with flowers and fruit. Many of the leaves show the pair of characteristic ant-pouches at the base of the blade.

[graphic]

Plate XXVIII

Barteria fistulosa Masters

Fig. 1. Tree growing in secondary forest near the Tshopo River, Stanleyville, April, 1915. The horizontal branches and the spreading leaves are well illustrated.

Fig. 2. Two lateral branches inhabited by Pachysima &thiops (F. Smith). The upper one demonstrates the spreading leaves and the sudden swelling at the base of the branch; the lower one, sectioned longitudinally, shows the cavity occupied by the ants. Medje, October, 1910.

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