APPENDIX 



A STUDY OF GALL MIDGES III 



I 



PORRICONDYLARIAE 



The members of this tribe of the Itonididae may be recognized by 

 the possession of a distinct crossvein in connection with the first 

 tarsal segment being shorter than the second. The crossvein is so 

 characteristic of the group that a Httle experience suffices to sep- 

 arate members from aU other Itonididae except in the case of a few 

 anomalous forms. This crossvein usually runs parallel to costa, or 

 nearly so, though in Colpodia and its close allies the crossvein may 

 be at a considerable angle to costa. This latter is also true, but in 

 a different manner, in Winnertzia. Diallactes KieiT. is remarkable 



Fig, I Winnertzia pectin at a; lateral view of adult, enlarged (original) 



127 



