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Oké…then the dorsal seta has to be a preapical dorsal seta!
On the photo i added, we indeed can see also a preapical anterior dorsol seta.
Presuming both setae are preapical, there is indeed no posterodorsal present (couplet 75)

Then we can go again from there:

75 Hind tibia without posterodorsal setae = correct (go to 78)
78 Mouthedge seems not projecting beyond level of profrons (what i see) = correct (go to 79)
79 Is the av on t3 in a ventral position....or not (difficult to for me to say)
When it is = it is C.pudorosa
When not = go to 80
80 subcostal cell on wings not darkened = correct (go to 81)
81 antenna entirely black + only one presutural dorsocentral = correct (go to 84)
84 mid and hind femur entirely or predominantly yellow, at most apical half contrasting black = correct (go to 85)
85 hind tibia with only one av = correct (go to 87)
87 posteroventrals on whole length of hindfemur + body longer then 3.5 mm or posteroventrals only in basal half + body at most 3.5 mm
You said the fly was 4.5 mm, so there has to be pv on the whole length of the hindfemur ! = go to 88
88 presutural acrostichals in 2-3 well separated rows + flagellomere about 2.5 times as long as broad+ scutum with 2 distinct longitudinal stripes = seems correct (go to 89)
89 presutural acrostichals in 2 rows = correct (go to 90)
90 frontal triangle reaching anterior margin of frons = C.albicornis
frontal triangle not reaching anterior margin of frons = C.lineatipes
I personally think the frontal triangle is reaching anterior margin (the silvery line going from the triangle to almost the margin of frons)

Possible species C.pudorosa + C. Albicornis + C. Lineatipes
Based on the absent of a dorsal seta you mentioned before

Remember also......this is a female and discription of the females are very poor !!

Succes again....:D
Joke