302 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
roads cross. Here hold the bottle upside down, and as they 
fall out repeat aloud three credos. Then all the cockroaches in 
the house from which these three came will go away" (Blatchley, 
Fig. 25. — Diagram of the fully developed tegmen and wing of a Blattid. 
1. Marginal field. A — Anal sulcus. 
2. Scapular field. Ax — Axillary vein. 
3. Discoidal field. C — Costal veins. 
4. Anal field. D — Discoidal vein. 
5. Anterior field. M — Median vein. 
6. Intercalated triangle. Mr — Branches of median vein. 
7. Posterior field. Ms — Mediastine vein. 
72— Radiate veins. 
U — Ulnar vein. 
In species where the area here represented by the Intercalated Triangle is more extensive and 
reflexed, it is termed the Appendicular Field. (From Hebard, Blatt. N. A., and Trans. Amer. 
Ent. Soc, vol. 42, 1916.) 
from Janvier). Possibly this treatment might not be effective 
in New England. 
The student of our Roaches needs a copy of Hebard's work, 
