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Hello paqui,

I was interested to find these spines myself as I took pics of both male and female C. tibialis this year. I can see some faint, pale spines on the thorax of the male and it appears the female has some too but they don't show very well at some angles.

I was going to post my pics, but I searched the site and found some which show the spines well. I guess these are the 48 you have read about.

http://diptera.in...post_42064

Janet:)