454 Scientific Proceedings, Royal Dublin Society. 
Of the fifty-five genera of Gomphine, eighteen are found in 
the NzorropicaL Rrcion. Sixteen of these may be reckoned as 
peculiarly Neotropical, including two (Progomphus and Gomphoides) 
which have each a species in the Sonoran. Except for four pecu- 
liar Chilian genera, the Cordulegasterine section is absent from 
the Neotropical Region. Henpetogomphus is divided between the 
Mexican sub-region.and the Sonoran; though it has but four 
species in the Uuited States to six in Mexico, its affinities suggest 
that it isa Sonoran genus invading the tropics. The Sonoran 
RxEGIon possesses eight other Gomphine genera (not reckoning 
the two Neotropical stragglers mentioned above), but only three 
(Octogomphus, Dromogomphus, and Teeniogaster) can be claimed as 
peculiar. 
lixcluding Macrogomphus, an Oriental genus with one species 
in Thibet, and Jctinus, an Oriental and Hthiopian genus with 
three species in China, the Horarcric Recion has twelve genera 
of Gomphine, of which four only (Davidius, Sieboldius, Vanderia, 
and Zorena) are peculiar. These are, all four, small genera, and 
it is noteworthy that the first and second are confined to the 
Manchurian, the third to the Mediterranean, and the fourth to the 
Canadian sub-region. 
The Eruiop1an Recion has ten genera, of which six are 
peculiar, but nearly all of these have only one species each. The 
Mascarene Recton has five species of the wide-ranging genus 
Lindenia (= Onychogomphus), and the peculiar genus /somma with 
one species. In the OrirnTaL Reetion are found eighteen genera, 
just the same number as the Neotropical possesses ; thirteen of these 
may be reckoned as peculiar to the region. The AusTRALIAN 
Reeton is very poor in Gomphines. The Austro-Malayan and 
Polynesian sub-regions are apparently devoid of these dragon- 
flies; and Australia and New Zealand have but five genera. 
Three of these are peculiar, and it is noteworthy that the Aus- 
tralian Petalwra and the New Zealand Uvropetala are allied to 
Neotropical genera confined to the Chilian sub-region, while the 
genus Hemigomphus has five Australian and one Brazilian species. 
The wide-ranging gomphine genera show many points of 
interest in their distribution. Lindenia (= Onychogomphus) is 
dominant over the Oriental and Ethiopian Regions, and spreads 
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