72 
Literature: 1) Beitrag II. Marcellia. Vol. IX, 1910. N°. 427, p. 54. 
Beschreib. von Gallen aus Celebes etc. Bull. d. Jard. Bot. d. = 
Buitenzorg. Série II. N°. XXI, 1916. N°. 39. Figure 39. p. 35. : 
3) Navepa. A. Eriophyiden dilate. Marcellia. Vol. XIII, 1914, p. 68. 
N°. 8. Melastoma malabathricum L. 
A leaf-gall formed by a gallmite. 
The margin of the leaf is rolled upwards, either 
for a part near the top or along its whole length. 
The edge curls slightly inwards so as to form a 
chamber that is fairly well closed (see fig. 10). 
By this formation the gall strongly reminds 
a gall formed by Thripses. The rolled margin 
often turns red or yellowish. 
Island of Krakatau, on a few plants along a 
watercourse in the grassy levels near the coast. Fig: 10. ‘Metastoma 
Herb. N°. 3600, April 25th 1919. malabathricum 1, 
Literature: Beitrag IV. Mareellia IX, 1910. N°. 490, p. 187. 
N°. 9. Nauclea purpurascens Korth. 
A gall of the mid-rib, formed by a gall-gnat. 
This gall was of fairly 
\ os : = general occurrence on young 
SO, ae plants in a ravine entirely 
tees : grown with young forest. 
MA The gall is also known to 
exist in Java *) and Suma- 
tra '). They chiefly arise on 
the under-surface of the 
leaf on the midrib and its 
strongest off-shoots. The rib 
distends into a little gall 
2—5 mM. long and 1'/,— 
3 mM. broad. At the centre 
there is a larval chamber. 
The gall is clearly marked 
off from the _leaf-blade, 
PR = = covered both above 
