Differences are shown to exist in the interpretation of the venation of the wings of Periplaneta americana presented by a number of recent authors.
The venation of the wings is re-examined along with the tracheal system of the nymphal wing-pads. The two are compared.
An interpretation of the venation of tegmen and hind-wing is presented which is in agreement with the basic postulates of the Comstock-Needham system of vein-nomenclature. Snodgrass's (1935) terminology for the veins is applied.