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Published online by Cambridge University Press: 11 June 2012
The larval tracheal system of Tabanus bisignatus is described and compared with the previous descriptions of Hœmatopota pluvialis by Cameron (1934) and of Tabanus, Chrysops and Hexatoma by Stammer (1924). Omissions in these descriptions are pointed out, and possible homologies of the tracheæ are discussed in terms of the generalized dipteran larval pattern deduced by the author from comparative studies of the tracheal system in certain larval Diptera (Whitten 1955). Attention is drawn to departures from this generalized pattern—departures which may be characteristic of family or of intra-familial segregates.