Illustrations ix 
XXV.—Potadoma ponthiervillensis; Potadoma ponthiervillensis spoliata; Potadoma 
superba, type and paratypes; Potadoma mungwana, type; Potadoma superba 
inculta, type and paratype. 
XXVI.—Potadoma ignobilis; Potadoma alutacea, type and paratype; Potadoma liri- 
cincta; Potadoma liricincta major; Potadoma liricincta, type; Potadoma liricincta 
latior, type; Potadoma liricincta walikalensis, type; Potadoma liricincta semper- 
lirata, type and paratype; Potadoma liricincta dryas, type and paratype; Pota- 
doma pokoensis, type and paratype. 
XXVII.—Egeria congica. 
XXVIII.—Egeria congica; Iphigenia curta. 
XXIX.—Egeria tenuicula langi, type; Egeria nux, type. 
XXX.—I phigenia rostrata; Etheria ellaptica carlliaudt. 
XX XI.—Parreysia leopoldvillensis; Parreysia bakert; Parreysia stuhlmanm; Parreysia 
mweruensis; Parreysia ngesiana; Parreysia regis, type; Parreysia acuminata. 
XXXII.—Celatura gerrardi; Cexlatura mesafricana, type; Cexlatura stanleyvillensis, 
type and paratype; Celatura elegans. 
XXXIII.—Celatura stagnorum; Czlatura stagnorum bome, type; Cezlatura stanley- 
villensis, paratype; Celatura elegans; Cezlatura rotula, type. 
XXXIV.—Aspatheria protchei; Aspatheria chapint, type. 
XXXV.—Aspatheria sinuata. 
XXXVI.—Aspatheria sinuata. 
XXX VII.—Aspatheria wissmant. 
XXXVITI.—Mutela dubia. 
XXXIX.—Mutela rostrata; Mutela langi, type. 
XL.—Mutela garambzx, type and paratype; Mutela garambe pretenuts, type. 
XLI.—Mutela mabilli; Mutela iris, type; Mutela larger. 
XLII.—Mutela nilotica; Mutela emini; Aspatharia chapint, type. 
XLIII.—Mutela hirundo; Aspatheria flava, type. 
XLIV.—Iridini spekii; Aspatheria flava, topotype. 
XLV.—Pseudospatha tanganyicensis; Pseudospatha tanganyicensis livingstonvana, 
Pseudospatha ortmanni, type; Pseudospatha stappersi, type. 
XLVI.—Etheria elliptica form tubifera. 
XLVII.—Preparation of chalk from the valves of Etheria elltptica at Niangara. 
XLVIII.—Inundated forest at Niapu, in the Ituri District. 
XLIX.—Rain forest on dry soil between Banalia and Bergamisa, typical of the Ituri 
District. | 
L.—Second-growth forest between Rungu and Nala, in the Ituri District. 
LI.—Second-growth forest and banana plantation at edge of a village, near Rungu in 
the Ituri District. 
LIT.—Savanna forest near Garamba in the northeastern Uele, at the close of the rainy 
season, July, 1912. 
LITI.—Savanna forest 40 miles northeast of Bafuka in the northeastern Uele, after a 
grass fire, March, 1913. . Forest gallery along a stream in the background. 
LIV.—Granitic outcrop on the Congo-Nile divide near Aba, December, 1911; 
savanna in the region of Mt. Bangu, near Kitobola, Lower Congo. 
LV.—Living Burtoa nilotica nilotica, at Masindi, Uganda. 
LVI.—Savanna between Mahagi and Aru in the northeastern Ituri District, with 
forest gallery in the center. 
