APPENDIX 



A STUDY OF GALL MIDGES III 



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 little experience suffices to sep- 

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

 anomalous forms. This crossvein usually runs parallel to cost a, 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 Kieff. is remarkable 



Fig. i Winnertzia pectinata; lateral view of adult, enlarged (original) 



127 



