Black insects ? What are they...

[murihikukid]

Hi..I am growing tomatoes inside under lights and yesterday removed most of my lights...This revealed that above my tomatoes on my ceiling were a lot of cobwebs and in these cobwebs were a lot of black bodies so I have taken photos and posted them....Now these insects are not in cobwebs any where else in the house and rarely do I see one flying around but I do see a light fawn coloured insect flying around now and then...

I have checked my soil and under the leaves and surely I would see them them if they were there so where do they come from...I just do not know ...Could they come through from above the ceiling? or in my freezer shells that hold the drums with my plants in them and the soil is heated underneath by hot air coming from a panel heater on a thermostat ....and are they killing my plants with disease....

Hopefully somebody has seen such insects although one is an oddball and looks more like a mossie but then again it may not be....

Thanks for any help solving this problem and what to do about it...

Thanks Ron...