BY R. J. TILLYARD. 



575 



cul hm pi 



Cu I+ JA' 



Text.Fig.49. 

 Gynoplistia bella (Walk.) (Order Diptera, fam. Tipitlidae) forewing 

 showing the structure of the media and cubitus. Lettering as on 

 p. 535. 



M are l'etained. Text-tig. 49 shows very clearly that the inter- 

 pretation of the veins given above for Rhyphus is correct, not 

 only because Cuj is clearly simple in this ancient type, but also 

 because ~M* comes off directly from the median cell (mc). 



In the introductory part of this paper, we remarked that 

 the tracheation of the pupal wing sometimes offered valuable 

 evidence, even in the ease of a merotracheate type. Text-fig. 



Text-Fig. 50. 

 Base of pupal wing of Comptosia sp. (Order Diptera, fam. Bomby- 

 liidae) dissected out from sheath, just before metamorphosis, to 

 show the merotracheate condition, and the complete cubital trachea, 

 (x 36). Lettering as on p. 535. 



