SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 141, PL. 36 



B 



Chemical defense of Dif'loptcra punctata against predators; the spray pattern is displayed 

 on Kl-starch indicator paper. A, Spray pattern after right niesothoracic leg was pinched. 

 1>, Cumulative spray pattern after left niesothoracic leg of the same insect was pinched. 

 C, The defensive glands of the cockroach on the left had been excised, and it is under per- 

 sistent attack by ants from a laboratory colony of Pogonoinyrmcx badius (Latreille). The intact 

 cockroach on the right was also attacked by the ants, but it discharged a spray of quinones 

 and repelled the attackers. (From Eisner [1958], through the courtesy of Ur. T. Eisner.) 



