Diachasmimorpha fullawayi differs from the other Afrotropical species of
Diachasmimorpha by the absence of carinate sculpture on the second metasomal tergum. However, this sculpture is sometimes only weakly developed in males of these other species. A more definitive character for identification is the presence of two small median teeth along the apical margin of the clypeus in
Diachasmimorpha fullawayi. (An alternative way of looking at this character is as a weak median indentation giving the appearance of a small tooth on either side.) These may be difficult to see (see translucent part of clypeal margin in Fig. 7), but are otherwise diagnostic for this species.
Additional morphological features of use in distinguishing Diachasmimorpha fullawayi from other members of the genus are: 1) the fore wing 1cu-a is not as widely separated from 1M; 2) the lateral margin of the mesonotum between the notaulus and tegula is more distinctly carinate; 3) the notauli are often weakly sculptured basally; and 4) the first flagellomere is slightly shorter than the second.