Thank you for the link. It seems relatively certain that Irving is one of the mosquito species from the genus Toxorhynchites, also called an "elephant mosquito". There is some information on this genus in Wikipedia, but it doesn't give details about the origins of the different species. I had read in a couple of other places how these are being used to reduce the occurrence of dengue fever, due to their predatory behavior towards other mosquito larvae.
Here's the Wikipedia link for anyone interested:
Toxorhynchites - Wikipedia, the free encyclopedia
Here's another link to a scientific paper that talks about the biology of Toxorhynchites mosquitoes and their potential as biocontrol agents:
http://www.cabi.org/bni/FullTextPDF/...0003030873.pdf
This paper indicates that Toxorhynchites mosquitoes inhabit most of the tropical regions of the world.