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I'm trying (purely for fun) trying to grow Honeydew melons in the greenhouse. I understand I have to hand pollinate but on looking at the flowers they all look female to me. Not a stamen to be seen and I've plenty of flowers to check on. What is going on ? Any ideas ?

All my squashes that are in flower have female flowers due to the hot days last week.  This will soon change.  Normally all the male flowers come out first, because it is cooler, but this year it is the other way round with blazing May and wintry June (so far) 

PS:  you shouldn't have to handpollinate if you have bees in the greenhouse

I tried melons in the greenhouse last year like you just for fun I had 2 plants and got 1 melon off of each I did not hand pollinate as did not think that I should I am trying again this year with more plants mine have not got flowers yet but I will look out for the male flowers and see what happens