80 
greater extent. In this way more or less irregular rolls are 
formed, as are visible in fig. 20. Espe- 
cially the apex of the leaf is entirely 
disfigured, frequently producing a 
long roll, spirally twisted. The tint 
of the gall is of a light yellow, some- 
times nearly white. As the galls ma- 
ture, the infected parts of the leaf 
whither and become dry whilst the 
normal parts continue alive. The 
cell is tenanted by a few psyllida- 
larvae. 
The host-plant was found by Va- 
LETON in 1904, but was not collected 
Nig. 20. Thespesia popuinca Soland. later, 1 myself found only one well de- 
veloped specimen on Verlaten-Eiland, plentifully covered with galls. 
Verlaten-Eiland. Herb. N°. 3867, April 29th 1919. 
N°. 21. Trichosanthes tricuspidata Lour. 
A stem-gall produced by a gall- 
gnat. 
This gall has not yet been described 
from Java, though an exactly similar one 
: on Coccinea cordifolia Cogn. ') has. They 
: are irregular fusiform swellings, situated 
near the distal end of the stem. Some- 
times the growing apex is incorporated 
_ - with the gall; the twig cannot sprout 
_ further in that case, but frequently the 
infection was produced lower down, so 
that the stem can continue its normal 
gro’ rth ee. fig. 21). The longitudinal 
are elo 1 and narrow like 
SSCA LS YY 
in other stem on centons 
bel sista hae Jan 
igre 
3 
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