Il8 MELANDER. 



tlie coast-region. Its extended island-distribution appears to be 

 in part artificially effected. Brazil, the Mediterranean region and 

 India seem to be the points of differentiation of the groups Olyn- 

 tha, Embia and Oligotoma, respectively. 



The internal anatomy presents a generalized type. But little 

 change is undergone during metamorphosis. The oviducts of an 

 old female may be as large as the alimentary tract. The females 

 have all available space occupied by the fat body and later by 

 the developing eggs. The brain is much less developed than the 

 ventral nerve chain. The visceral system comprises four promi- 

 nent unpaired cephalic ganglia. 



Embryonic growth is completed in about a month. The eggs 

 have a unique micropylar apparatus and are not oriented in the 

 female in their definitive position. The history of the embryo 

 conforms with the Orthoptera, of which group the family is con- 

 sidered as a conservative and ancient branch. 

 HULL ZOOLOGICAL LABORATORY, 

 THE UNIVERSITY OF CHICAGO. 



