CHAPTER X. 



DEVELOPMENT. 



SPECIAL REFERENCES. 



KATHKE. Zur Entwickelungsgesch. der Blatta yermanica. Meckel's Arch, of 

 Anat. n. Phys., Bd. VI. (1832). 



BALFOUR. Comparative Embryology, 2 vols. (1880-1). 



GRABER. Insekten, Vol. II. (1879). 



LUBBOCK. Origin and Metamorphoses of Insects (1874). 



KOWALEWSKY. Embryol. Stuclien an Wiirmern u. Arthropoden. Mem. Ac. Petersb. 

 Ser. VII., Vol. XVI. (1871). 



WEISMANN. Entw. der Dipteren. Zeits. f. wiss. Zool., Bde. XIII., XIV. (1SG3-4). 



METSCHNIKOFF. Embryol. Studien. an Insecten. Ib., Bd. XVI. (18G6). 



BiiTSCHLi. Entwicklungsgeschichte der Biene. Ib., Bd. XX. (1870). 



BOBRETZKY. Bildung d. Blastoderms u. d. Keimbliitter bei den Insecten. Ib., 

 Bd. XXXI. (1878). 



NUSBAUXI. Rozwoj przewodow organow pteiowych u owadow (Polish). Kosmos. 

 (1884). [Development of Sexual Outlets in Insects.] 



Struna i struna Leydig'a u owadow (Polish). Kosmos (1886). [Chorda 

 and Leydig's chorda in Insects.] 



The Embryonic Development of the Cockroach* 



BY JOSEPH NUSBAUM, MAGISTER OF ZOOLOGY, WARSAW. 



THE development of the Cockroach is by no means an easy 

 study. It costs some pains to find an accessible place in which 

 the females regularly lay their eggs, and the opaque capsule 

 renders it hard to tell in what stage of growth the contained 

 embryos will be found. Accordingly, though the development 

 of the Cockroach has lately attracted some observers, the 



* In the following description it is to be understood that the observations have 

 been made upon Blatta germanica, except where P. orientalis is expressly named. 



