70 
a Psyllida. I only came across a few specimens of this gall. 
For a small part of its length 
the jeaf-margin curls upwards 
so that the non-infected part of 
the margin is drawn inward, 
Figure 8. The infected portions 
turn a brigt yellow and the 
cortex of the curled part is con- 
siderably thickened. The edge of 
the rolled part curls back to the 
beginning of the rolling so as to 
form a closed chamber. In many 
respects this gall resembles the 
leaf-margin-gall also formed by 
a Psyllida on Helicia attenuata. 
Island of Krakatau at an elevation of abt. 1000 ft. in a den- 
sely vegetated ravine. 
Herb. N°. 3647, April 26th 1919. 
Literature : sii Beschr. von Gallen aus Celebes etc. Bull. Jard. Bot. Buitenzorg. 
Série II, N°. XXI, 1916. N°. Figure 35, p. 34. 
Fig. 8. Llomalanthus populneus Grah. 
N°. 7. Macaranga Tanarius L. 
A leaf-gall formed by a gall- ie Eriophyes dacti- 
lonyx Nal. 
The galls collected on Krakatau differ in some esa 
from those found on Java") and Saleier*), which have already 
been described. But there exist transitions between the galls 
such as they are found in Java and the form which is 
most prevalent on Krakatau. The tiny galls, that form small 
pa ‘head eminences on the upper leaf-surface, also occur on 
ae ‘Krakatau, but beside these I also found very much larger 
Specimens, illustrations of which are to be seen in fig. 9. They 
Wve where pir wig or conical eminences, whose rind is 
iowa hirsnte, but « ex- s 
