XIV, 5 Uichanco: Philippine Plant Galls 533 
The present work has not been comprehensive enough to 
warrant our drawing very definite conclusions; but an examina- 
tion of the above list tends to show that the Euphorbiacez have 
the greatest number of gall-making species, with the Moracez 
ranking second. 
Classified as to causes, the following numbers of galls were 
obtained: 
Species of 
insects. 
Itonidid galls 19 
Psyllid galls 7 
Thysanopterous galls 7 
Eriophyid galls 7 
Gelechid galls 1 
Miscellaneous galls * 16 
2 “Miscellaneous galls” includes all the galls of which the causative agent is not definitely 
known. 
Galls of the insects mentioned in the introductory paragraphs 
of this paper, other than those of the families enumerated above, 
have not been met with in the present investigation. Species 
of Cynipide and Tenthredinide ** have been reported from 
the Philippines, and the chances are that further work will lead 
to the discovery of the galls of the former, at least. The latter, 
Selandria (Paraselandria) imitatrix Ashm., according to Prof. 
C. S. Banks, the collector of the type, is an exophagous species 
and not a gall maker. 
The Aphidide and the Coccidz are well represented in the 
Philippine fauna; but none of their galls have been found in 
connection with my work. It is not unlikely that their galls 
can be found here; for in Australia, a country that has many 
insects closely allied to Philippine species, among the largest 
and most remarkable galls are produced by some members of 
these families.'* 
The families Trypetidee (Diptera) and Buprestide (Coleop- 
tera) include many important pests of Philippine economic 
plants. Their work, however, has not been known to result 
here in the formation of galls. fe 
In the various excursions made, it was noted that altitude 
influences the number of species of plant galls to a considerable 
” See Kieffer, Nouveaux cynipides des Philippines, Philip. Journ. Sci. 
§ D 9 (1914) 188; Neuer Beitrag zur Kenntniss der philippinischen Cyni- 
piden, Philip. Journ. Sci. § D 11 (1916) 279. 
™ See Ashmead, Proc. U. S. Nat. Mus, 28 (1905) 971. 
™ Frogatt, Australian Insects (1907) 369, 370, and 380-383. 
