200 UNITED STATES NATIONAL MUSEUM BULLETIN 2 76 



WiGGLESwoRTH, V. B. — Continued 



1953. The principles of insect physiology. 546 pp. Methuen & Co., Ltd., 

 London. 

 Williams, J. L. 



1939. The mating and egg-laying of Malacosoma americana. Ent. News, 

 vol. 50, No. 2, pp. 45-50, and continued in vol. 50, No. 3, pp. 

 69-72. 



