350 
ZOOLOGY: E. P. FELT 
prey upon mites and certain insects, while a very large majority pro- 
duce characteristic galls upon the different parts of a great variety of 
plants. Not a few are inhabitants of blossom buds, with a very lim- 
ited period for feeding and growth and an extended estivation or hiber- 
nation, while many others pursue these vital activities through most of 
the growing season. Summarizing, we may state that great structural 
variations and equally marked physiological and ecological adaptations 
are accompanied by a puny organization and a world-wide distribution. 
What are the most important factors which have brought this about? 
It is impossible, owing to the Hmited knowledge of this group from 
important faunal regions, to present a complete story. Fortunately 
there are a number of genera with sufficiently well marked characters 
as to render their identification reasonably certain, and for a number of 
these there are records from such widely separated locahties as to 
justify the characterization of their distribution as world-wide. The 
presumption is against their occurring in all faunal regions, though 
they probably exist in most places where climate and flora combine 
to make this possible. There are in addition to the above, a number of 
genera which have been recorded from such distant countries as to 
justify the suspicion that they Hkewise may have a world-wide or 
nearly world-wide distribution. A tabulation of these genera is given 
below. 
Itoned Genera of Presumably WoRLD-WroE Distribution 
TRIBE AND GENUS 
NORTH 
AMERICA 
SOUTH 
AMERICA 
EUROPE 
ASIA 
AFRICA 
AUSTRA- 
LIA 
NEW 
ZEALAND 
Lestremiinariae 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Campylomyzariae 
*Campylomyza Meign 
+ 
+ 
+ 
*Joannisia KJeff 
+ 
+ 
+ t 
Heteropezinae 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Spaniocera Winn 
+ 
Porricondyliariae 
+ 
+ 
+ 
+ 
*Colpodia Winn 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Camp torn jda Kieff 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
