descriptions of
Myxosargus nigricormis, as well as
Madiza conicola and
Chrysotoxum coloradensis
ITIS says
Madiza conicola is a junior synonym of
Hapleginella conicola and that
Chrysotoxum coloradense is an invalid junior synonym of
Chrysotoxum fasciatum. There’s no ITIS listing for
Chrysotoxum coloradensis as it’s spelled in the original paper.
full text
alternate source