154 



Herewith are reproductions of drawings of both galls. The first gall is 

 a very large swelling of the main nerve of the leaf, which is equally develop- 

 ed on both sides of the leaf-blade (Fig. 2). The second gall which is hardly 

 ever found is very small and f Jat, as can be seen from the accompanying figure; 

 (Fig. 3). It is certainly quite remarkable that both gall-formers should belong 

 to the same species. Since both gallforms can occur on one leaf, it is hardly 

 possible to accept the fact that both could be formed by the same individual. 

 Only experiments could make it clear, whether we have to deal here with one 

 or two species. My experiments with the gallformes of the Aulax-galls ^) on 

 different species of poppies (Papaver) and of the Isosoma-species on Triti- 

 cum-plants -), have taught me that there are different sub-species which only 

 form galls on the kinds of plants constantly infected by them. 



Stefaniella orientalis Felt. This gallmidge forms galls on Lepidagathis 

 javanica Bl. The gall has already been described in „Einige Gallen aus Java" ^). 



Lasioptera manilensis Felt. This midge forms a very commonly occurring 

 gall on Leea sambucina Wild, already described in „Einige Gallen von Java" *). 

 Herewith we have joined a picture of the gall which had not been figured yet. 

 (See fig. 4). Uichango ^) gives a description of a very similar gall on Leea 

 manilensis Walp. of the Philippines. 



Schizomyia nodosa Felt. It forms galls in the flowers of Moschosma 

 polystachum Benth., which has already been decribed and figured of Java ®). 

 We stated then that the gall was formed by a gall-mite, which it is true 

 occurred in the gall; but the original gall is a swelling of the pistil, which 

 is quite hidden by the strongly developed calyx and corolla with the result 

 of a balloon-shaped deformity. In the infected pistil one finds a small cell 



1) J. Reijnvaan and W. Docters van Leeuwen. Aulax papaveris. Its biology 

 and the development and the structure of the gall which it produces. Marcellia Vol. 

 V. 1906. p. 137. 



2) W. UND J. DocTERS VAN Leeuwen-Reijnvaan. Ueber die Anatomie und 

 die Entwicklung einiger Isosoma-Gallen auf Triticum repens and junceum und ueber 

 die Biologie der Gallformer. Marcellia Vol. VI. 1907. p. 68. 



3) W. und J. Docters van Leeuwen-Reijnvaan. Einige Gallen aus Java. 

 VIII ter Beitrag. Bull. d. Jard. Bot. d. Buitenzorg. Série III. Vol. I. 1918. pag. 51. No. 606. 



4) idem. liter Beitrag. Marcellia Vol. VIIL 1909. page 104. 



5) L. B. Uichango. A biological and systematic study of Philippine Plant Galls. 

 Phil. Journ. of Science. Vol. XIV 1919. .page 539. Plate IX. Fig. 1, 2 and 3. 



6) W. UND j. Docters van Leeuwen-Reijnvaan. Einige Gallen aus Java, 

 inter Beitrag. Marcellia. Vol. IX 1910. pag. 52. No: 130. Fig. 57. 



