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Art Borkent published a monograph on the pupa of biting midges of the world with a key to the genera in zootaxa: http://www.mapres...79(1).html

full reference:
Borkent, A. (2014). The Pupae of the Biting Midges of the World (Diptera: Ceratopogonidae), With a Generic Key and Analysis of the Phylogenetic Relationships Between Genera. Zootaxa 3879:1-317.