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A BIOLOGICAL RECONNAISSANCE OF THE OKEFE- 
NOKEE SWAMP IN GEORGIA. THE TIPULID^. 
[Diptera] 
CHARLES p. ALEXANDER 
Dicranomyia liberta Osten Sacken. One male, Billy's Island, 
June 20, 1912. This is a common and widely distributed 
species throughout the Eastern United States and Canada. 
Erioptera chlorophyUa Osten Sacken. A male and a female, 
Honey Island prairie, June 1, 1912, on water-lily pads. 
Erioptera (Mesocyphona) caloptera Say. One male, Billy's 
Island, July 8, 1912. 
Erioptera (Mesocyphona) parva Osten Sacken. Several males 
and females, Billy's Island, June 30, 1912. This species and 
the last are widely distributed in North America east of the 
Rockies and in the northern parts of South America. 
Gonomyia (Leiponeura) puer Alexander. Several of both 
sexes from Billy's Island, June 25, 1912. This species was 
described from Santo Domingo and has since been taken in 
several localities in Florida. 
Limnophila tenuipes Say. One male, five females, Billy's 
Island, June 20, 1912. 
Brachypreinna dispellens Walker. One male, Billy's Island, 
June 20, 1912. The local name of these conspicuous flies is 
''weaver." The species taken is the only one of the genus 
found in the United States. It ranges from New Jersey south 
to Paraguay. 
Oropeza obscura Johnson. Two males, Billy's Island, June 
20, 1912. 
Pachyrrhina ferruginea Fabricius. One male, Billy's Island, 
June 20, 1912. 
Pachyrrhina virescens Loew. One male, Billy's Island, June 
20, 1913. 
Pachyrrhina okefenoke Alexander, new species. 
Palpi dark brown, the terminal segment paler; antennae very 
short in both sexes; thoracic dorsum dull with three indistinct 
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