Metardaris cosinga - Hesperiid or Papilionid?

[The Arthurs]

Hi, everybody. 

Thanks for your information on my unusual Papilio zelicaon specimen. Since then, I have come up with a few other unusual specimens (if you want to see photos, contact me), including a very brown Pontia protodice, a Phyciodes orseis in the middle of Oakland, CA, and two Pieris rapae specimens with almost no marking on the FW. 
     But that is not the subject of this email. While browsing the Neotropical Butterflies website (great site), I found photos of a strange-looking butterfly in the Hesperiidae section. It is called Metardaris cosinga (Cosinga Firetip) and has features that appear intermediate between a Hesperiid and a Papilionid. In particular, look at the eye and the fur around it, the wing shape, resting position, and antennae. They all look suspiciously Papilionidish. 
     What do you all think? What features (?DNA, genitalia?) make people classify it as a Hesperiid. The look of this species makes me wonder whether the Papilionoidea and Hesperioidea superfamilies should be separate, or, even, if Pailionidae and Hesperiidae really should be separate families.      Thanks for your attention.     -- Noah Arthur. 
                                                                                              
notice: resting position, wing shape                                                                           notice: eye/fur around it, head hunched downward, antennae
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