are we talking real L144s or the colour morph of the common BN. I'll assume its the colour morph as real L144s are rare as, if they even still exsist.
The two things to look for are body shape and the positioning of the birstles if they have any. Males have the widest part of their body around their head then tapering down to the tail. Females have a much broader gut section and are wider. they also have a slight bump on their lip. The males are the only ones to develop birstles running up the nose. females only ever get them around their top lip, if they even get them at all.
Colour is not sex linked and therefore doesnt distinguish sex
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