DOCTERS VAN Leeuwen; Some galls froni Hongkong. 



26Q 



Literature cited : 

 D. V. L. Java I: Einige Gallen aus Java. Erster Beitrag Marcellia VIll. 1909. 

 D. V. L. Java II: idem Zweiter Beitrag Marcellia Vol. VIII. 1909. 

 D. V. L. Java III: idem Dritter Beitrag Marcellia Vol. IX. 1910. 

 D. V. L. Java IV: idem Vierter Beitrag Marcellia Vol. IX. 1910. 

 D, V. L. Java V: idem Funfter Beitrag Marcellia Vol. X. 1911. 

 D. v. L. Java VI: idem Sechster Beitrag Bulletin du Jardin, bot. de Buitenzorg, 



Série II. No. III. 1912. 

 D. V.L.Java VII: Siebenter Beitrag Bulletin Série II. No. XV. 1914. 

 D. V. L. Sumatra: idem Beschreibungen von Oallen aus Sumatra und Sima- 



loer. Bulletin Série II. No. XXI. 1916. 



No. 1. Àcronychia laurifolia Bl. 



Leaf-gall caused by an acarid. 



This is a very common gall in Java. Its irregular 

 yellow or lightgreen bladders are developed on the 

 undersurface of the leaf, average size about 5 mm. 

 (in Java up to 50 mm). On the opposite surface of the 

 leaf is a narrower or wider aperture giving access to 

 the gallroom, the wall of which is covered by a dense 

 erineum. This erineum consits of branched unicellular 

 hairs. See the subjoined figure 1. 



New-Territory, Sha-Tin, in a young pine-forest. 

 10 Nov. 1920. No. 4953, 



Literature: D. v. L. Java V. No. 203 p. 67. 



Fig. 1. Acarid-galls on 

 Acronychia laurifolia Bl. 



X'/4 



î,%>i 



No. 2. Àporosa leptostachya Benth. 



A stem-gall caused by a gallmidge. 



On the bark are developed clusters of rounded galls 

 with a small larval-chamber. The surface is covered by a 

 light brown corky tissue. See the subjoined figure 2. 



Isle of Hongkong, 8 Nov. 1920. No. 4926. 



f-s»: 



1^^ 



f 



Fig. 2. Itonid- 

 galls on Aporo- 

 sa leptostachya 

 Benth. x^/4 



No. 3. A-porosa lepto- 

 stachya Benth. 



A leaf-gall caused by 

 a thrips. 



In Java we found an 

 exactiy similar gall on 

 Aporosa microcalyx Hassk., 

 which was produced by 

 Dolerothrips trybomi Kar- 

 NY. This infection gives rise 

 to closely packed straw- 

 green, red or dark-purple 



Fig. 3. A thrips gall on Aporosa 

 leptostachya BllNTll. nat. size 



