69 
found in Brazil and in the Bismarck Archipelago °), and by 
Napeza *) as occurring on the island of Upolo and Savanu. 
IT found it on Krakatau at only a few 
yards from the landingplace. The _ trees 
were badly infected in parts and the galls 
formed were often very big (see fig. 6). 
The galls presented themselves not only on 
the leaves but on the stems as well, the 
latter being a trifle smaller than the leaf- 
galls but other-wise of the same shape 
(see fig. 7%). The stipules were sometimes 
so badly infected as to have formed a thick 
lump or bunch. 
This gall has been described so often that 
I need only refer to the undermentioned 
publications. The gall-producer was described 
by Natepa ‘). 
Island of Krakatau. Herb. N°. 3505, April 
24th 1919 and Verlaten-Eiland, Herb. 
27th 1919. 
Fig. 7. Hidiseus tiliaceus Ih. 
N°. 3723 b, April 
Literature: 1) ae Vil. Bull. Jard. oe ‘sapere Série II, N*. XV, 
914. N°. 
430. Figure 
2) . IV. Marcellia. Vol. Tk. ot N°. 177. Figure 73, p. 181. 
3) Gallen aus Sumatra und Simaloer. Bull. Jard. Bot. Buitenzorg, 
Série II, Vol. XXI, 1916. N°. 22, p. 41. 
4) Gallen aus Celebes etc. idem. N°. 31, p. 
32. 
5) RuessaaMeN. Gallen aus Brasilien und Peru. Marcellia. Vol. 
VI. N°. 57, 144. 
6) Idem. Gallen vom Bismarck-Archipel. Marcellia. Vol. ph Ph int 
p. 13. 
7) Napeia. A. Bot. und Zool. Ergebn. einer wiss. Forsch. Reise 
in den Samoa-Inseln etc. VI. Eriophyiden. Denkschrifte Math. 
Naturw. Kl. der Kais. Akad. d. Wiss. Wien. Bd. 84, 1908, p- 3. 
N°. 6. Homalanthus populneus Grah. 
A leaf-gall formed by a Psyllida. 
This gall I found a few years ago on the island of Saleier '). 
On Java however I have not yet found it, though the tree, on which | 
it occurs, is very common. In the first description we gave ¢ of this — 
— we — the acces an a but a 18, in ier ae ao 
