64 
Of the 24 forms of gall-growths found by me there, 9 are 
not yet described as occurring on Java and Sumatra. From Java 
I am acquainted with about a thousand different galls, from Su- 
matra I know a few hundreds, but these are only a part, and 
probably a small part, of those actually existing. 
Below follow the descriptions of the cecidia found by myself; 
those not yet described in any contributions on galls of this 
Archipelago have been marked by an *. To nearly all of them 
I can subjoin illustrations drawn under my supervision by the 
native draughtsman Hoesein. 
DESCRIPTION OF THE GALLS COLLECTED. 
N°. 1. Clerodendron inerme Gatern. 
A leafbud- and stem-gall, formed by a gnat. 
The galls on the leaves are semi-globular on one side and have 
the shape of truncated cones on the other; 
their hue is mostly a lighter green than 
the leaf itself. Sometimes they are even 
pink. At the interior there is an elongated 
larval cavity. When arriving at maturity 
the top of the cone fissures and the edges 
of the opening thus formed, curl outwardly, 
knowledge this manner of opening is of in- 
frequent occurrence in gnat-galls, this being 
K wy, on the other hand the most usual manner of 
opening with Psylidae-galls. Fig. 1 shows 
| @ closed and an open gall; the former is 
' really composed of two galls that have 
coalesced. 
ee In cases of strong infection even buds may 
ee be attacked, being g turned into irregular more or less ball-shaped 
_ malformations, see fig. 1. I have not yet found such a 
form of this gall on Java. In fig. 2 are represented a number 
of g a - that have: arisen on the stem. res may also 0 occur 
so that a large aperture is formed. To my 
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