532 
Philippine Journal of Science 
1919 
difficult to arrive at a definite conclusion as to the real gall 
maker. 
The adult gall insects were kept alive for from six to twelve 
hours in a cotton-plugged vial in order to give them time to 
dry and assume their normal color before they were killed. 
With the exception of the thrips and the eriophyids, two series 
of preserved specimens were prepared, one on small pins and 
the other on microscopical slides in Canada balsam or turpen- 
tine solution of colophony. If the specimens were scarce, only 
the former series was made of the adults. The thrips in all 
instars were always mounted on slides. When plenty of speci- 
mens of fresh insect galls could be secured, a number of these 
were carefully dissected, and the insects in their earlier stages 
removed and mounted on slides. In the case of transparent 
specimens, such as the earlier instars of psyllid nymphs and 
the larvae of Itonididae, which would be almost invisible when 
mounted on slides, resort was had to a previous staining in 0.5 
per cent aqueous solution of magenta red for about twenty-four 
hours. 
Drawings of anatomical parts of the gall insects were made 
with the aid of a camera lucida. Whenever practicable cor- 
responding parts of different species of the same family were 
drawn to the same scale and in the same position, in order to 
facilitate comparison. Most of the gall sections were too large 
to be drawn conveniently by the aid of the microscope and 
camera lucida, so that practically all the drawings of these ma- 
terials were made freehand. 
Fifty-seven species of galls have been worked with. These 
are distributed among twenty-six plant families, as follows : 
RESULTS 
Apocjuiaceae, 1. 
Aracese, 1. 
Araliaceas, 2. 
Boraginace£9, 1. 
Celastraceas, 1. 
Combretacese, 2. 
Compositae, 1. 
Dilleniacese, 1. 
Dipterocarpacese, 4. 
Euphorbiaceae, 10. 
Guttiferae, 2. 
Hernandiaceae, 1. 
Lauraceae, 2. 
Lecythidaceae, 1. 
Leguminoseae, 2. 
Loganiaceae, 1. 
Melastomataceae, 2. 
Menispermaceae, 3. 
Moraceae, 7. 
Piperaceas, 1. 
Rubiaceae, 1. 
Sapindaceae, 1. 
Tiliaceae, 2. 
UrticaceaB, 1. 
Verbenaceae, 3. 
Vitaceae, 3. 
