Cecidomyia veronicae. 



As a result of the oviposition of the female insect in the 

 spring, the upward growth of the stem of the plant is in 

 most cases completely stopped. Instances, however, are not 

 rare in which, during the summer, the stem has forced its 

 way beyond the galled point, and continued to throw out 

 leaves, but it is never quite of its normal character. The 

 two terminal leaves, which at the time of oviposition are 

 partly expanded, are retarded from further development. 

 They rise up and meet each other, their serrated edges 

 approximating with great accuracy. Meanwhile, the embryo 

 leaves they enclose endeavour to continue their growth, and 

 to a limited extent, are successful, causing considerable con- 

 cavity in the bases of the outside leaves. The feeding of the 

 larv.-t, which by then have hatched, speedily arrests any further 

 development. The colour of the enveloping leaves is pale 

 green ; but the excessive pubescence (the peculiar character of 

 which is seen in fig. 4), except at their apices, gives them a 

 whitish and woolly appearance. 



The illustration is of specimens gathered at Hastings by 

 the author. 



