FLIES OF THE GENUS OGCODES — SCHLINGER 



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pattern. Species of this group are known only from the Nearctic sub- 

 region, Chile, Iran, New Zealand and Tasmania. The relationships of 

 species between New Zealand and the United States is surprisingly 

 close, as nearly every species in the one area has a counterspecies in 

 the other. One species is known from the Palaearctic subregion, so it 

 is probable that species of this group will be found to inhabit the 

 Oriental region as well. 



The eugonatus group, though much more restricted, has a distri- 

 bution similar to that of the pallidipennis group. Representatives 

 are known from the Holarctic, Ethiopian, and southern Neotropical 

 regions. 



The brunneus group is endemic to New Zealand. 



The horealis group is Holarctic. It seems probable that it had a 

 much greater distribution in the past, as based on the present day 

 relationships, through members of the colei group. 



Figure 1. — Distribution of the genus Ogcodes in the worid. 



The porteri group is a Chilean endemic which lilvcly will remain so 

 due to the strong geographical barriers present, just as is the case for 

 so many animal species occurring there. 



It seems advantageous here to discuss species distribution on a re- 

 gional basis as well, since there appear to be definite trends of rela- 

 tionships appearing for the first time. The 23 Austrahan species are 

 divided into 11 from Australia, 6 from Tasmania, and 7 from New 

 Zealand. Only one species occurs in any two of the areas, that being 

 Ogcodes fortnumi Westwood, which is now known from Tasmania and 

 Australia. 0. basalts (Walker) may be found to occur in Tasmania, 

 since it is a common species in Australia (see discussion under basalts). 



