MORGAN HEBARD 



Diagram of the fully developed tegmen and wing of a Blattid. 



1. Marginal Field. 



2. Scapular Field. 



3. Discoidal Field. 



4. Anal Field. 



5. Anterior Field. 



6. Intercalated Triangle. 



7. Posterior Field. 



Ms. Mediastine Vein. 



D. Discoidal Vein. 



C. Costal Veins. 



M. Median Vein. 



Mr. Branches of Median \'ein. 



U. Ulnar Vein. 



A. Anal Sulcus. 



Ax. Axillary \'ein. 



R. Radiate Veins. 



This figure is gi\en, with the names used by previous authors for the various hclds 

 and veins, by Hebard, Trans. Am. Ent. Soc, xlii, pp. 185 and 186. pi. xiii, (1916). 



In species where the area here represented by the Intercalated Triangle, is more 

 extensive and reflexed, it is termed the Appendicular Field. 



MEM. AM. ENT. SOC. 



