338 WILLIAM LAWRENCE TOWER. 



Explanation of Plate I. 



Note. — On all of the plates the pattern of the head and pronotum are not drawn 

 with the true pattern and behavior which these cultures showed. The pattern 

 shown is a basal one common to all the species. 



Arranged to show the results obtained in crossing L. signaticollis 9 X cf -L. diversa 

 under the conditions of Exp. No. H 409. 



