I can certainly vouch for at least some midges reproducing indoors.
I worked at a WW treatment plant that had indoor sand bed filters as a polish on the effluent before returning it to the environment.
Somehow adult midges would find their way in and the sand filters became infested with blood worms. The adult midges swarmed inside the building to the point that their dead bodies would pile up inches deep in front of the windows.
That in turn supported an atronomical population of spiders to the point that webs covered everything and had to be hosed down frequently. It was a real mess. At one point they installed a automatic pesticide sprayer that fogged at intervals on a timer. Even that didn't work and somebody realized all that pesticide was going into the river. Eventually they just lived with it and the lowest guy on the totem pole had to go in once a month and hose dead midges and spider webs. Yuck.
As an interesting side note, the plant pulled water from just after the sand beds to use as wash water around the plant. Blood worms would get sucked up by the pumps and distributed through the plant where they would then clog filter screens. The plant chief operator, who was an ignorent putz but believed he was college educated hot sht, called them "pipe worms" and claimed they lived only in pipes where they lived out their whole life cycle. Most of the other operator believed and repeated this myth.
When I started there, I publically contridicted this gem of wisdom, explaining what chrinomids were and how they related to the flies in the filter room. The CO publically laughed at and ridiculed my ignorence. As an answer, I collected a few "pipe worms" in a covered beaker and left them on his desk. Next morning there were "filter flies" flying around in the beaker.
Not surprisingly, I never did hit it off real well with the CO.
Edited by mikez, 14 April 2008 - 11:29 AM.