73 
slits up on getting older causing one or more deep grooves. 
(see fig. 11). 
The host-plant was not found till 1904, by Vazxrron, now it 
is one of the most prevalent trees on Krakatau. Though the plant 
occurs at altitudes up to 1500 ft. and more above the sea, we 
found the galls near the shore only. 
Island of Krakatau in a ravine, at about 150 ft above sea- 
level. 
Herb. N°. 3599, April 25th 1919. 
Literature: 1) Beschreib. von Gallen aus Sumatra und Simaloer. Bull. du 
Jard. Bot. Buitenzorg. Série II. N°. 1916. N°. 38. Figuren 38, 
p. 16. =. 
2) Beitrag VIII. Idem. Série III. Vol. I. 1919 N°. (34, p, 58. 
*N°. 10. Nauclea purpurascens Korth. 
A leaf gall of the mid-rib formed by a gall-gnat. 
They are fusiform swellings of 
the mid-rib and its strongest 
off-shoots, easily distinguishable 
from the normal leaf-blade by 
their pale-green or yellowish 
colour. They are visible on both 
sides of the leaf but the bulk 
is on the under-surface (see /, 
fig. 12). The specimens collected |/ 
were about 6 mM. long and 3mM. | 
broad or less. But these speci- 
mens being very young, they } 
may be a little larger when full- }} 
grown. Inside there is a very \ Ay ES | 
narrow larvel cavity situated Fig. 12. Jai cic Nl aoe 
longitudinally. I found this, to me new, cecidious vegetation 
_ represented by a few specimens at about 1600 ft above sea- ee 
evel. 
1500 ft. 
Herb. N°. 3663. toe 26th 1919. 
Aen, Sard, Bot. Buitenz, Vol. XXXI._ 
Island of SGakaien. in a ravine at a aan ot atone sn 
