Macchis VS P38s 13 July 1943.

[Ludovico Slongo]

I'm trying to find out more details regarding an air combat between american P38s and Italian Macchis of 4° Stormo.

On the afternoon (unknown hour) of 13 July 1943 a formation of eight Macchis of 4° Stormo (possibly 9° Gruppo) composed by four MC 202s and four MC 205Vs and led by Capitano Giulio Reiner scrambled from the airstrip of Finocchiara and intercepted a reportedly six P38s with a top cover of twelve more P38s. The lower American planes looked as if they were fighter-bombers targeting the road north of Gela.
Reiner led his planes in a quick attack of the "fighter bombers" and claimed personally one of them that he saw exploding hitting the ground 15 kilometers north of Gela while the pilot was able to bale out.
In the meantime the upper section of P38s joyned the combat starting a confused dogfight that obliged the Macchis to retreat. The Italians came back to Finocchiara and didn't record any loss, only the plane of Reiner was damaged in the engine and the tail while Reiner himself suffered a broken tympanum caused by a sharp dive that he had performed while following another Lightning.
I'm wondering if somebody is able to identify the American unit(s) involved in this combat and -maybe- add some more details (or correct) the above description.
Thanks in advance.
Ludovico.