556 CAROLINE BURLING THOMPSON 



female. The cause of the decrease in the size of the mushroom 

 bodies in the queens of Camponotus and Formica is not so clear. 

 If the mushroom bodies are the chief motor centers of the brain, 

 their diminution may mean a lessened amount of motor activity. 

 It would be interesting to have minute and detailed information 

 in regard to the habits of these different queens, such as Bucking- 

 ham ('11) has given for worker ants. Is Camponotus perhaps 

 less active than Lasius? Does the period of flight end sooner 

 in one than in the other? Are the wings retained for a longer or 

 shorter time? 



It has been suggested by Professor Wheeler that I should study 

 the brain of the queen of Formica consocians, which is parasitic 

 in habit and also reduced in size. Formica exsectoides, whose 

 queen is likewise parasitic but not smaller, may also prove of 

 interest. These forms and others, such as the Eciton workers 

 with degenerate compound eyes, will form the basis of a later 

 paper. 



May 31, 1913 



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