KEY TO AMERICAN INSECT GALLS 



15 



KEY TO AMERICAN INSECT GALLS 



Polypodiaceae (ferns) 



Cystopteris fragilis (bladder fern) 



Root gall (Cosens, in litt. May 3, '15) 



Itonid. Cecidomyia sp 



Ephedraceae 



Ephedra trifurca 



Fusiform twig gall, length 12 mm. Fig. i. Ckll. '98, p. 327 



Itonid. Lasioptera ephedrae Ckll. 

 Irregular, subcortical, resinous gall. Ck 1. '02, p. 184 



Itonid. Lasioptera ephedricola Ckll. 



Fig. I. 

 Lasiop- 

 tera eph- 

 edrae Ckll., 

 showing two 

 galls, one 

 in section. 

 (Original) 



Fig. 2. Gouty 

 pine midge. Re- 

 tin o d i plosis 

 i n o p i s O. S. 

 Typical enlarge- 

 ment of twig. 

 (Original) 



Pinaceae (pines) 



Pinus (pine) 



Reared from fungous afifected heartwood, P. r i g i d a. Felt '13m, p. 191 



Itonid. Monardia lignivora Felt 

 Reared from Scolytid galleries in pine. Felt '13m, p. 188 



Itonid. Monardia pinicorticis Felt 

 Reared from bark of P. v i r g i n i a n a. Felt oje, p. 23 



Itonid. Winnertzia pinicorticis Felt 

 Subcortical twig swellings with pitch exudations, resinous cocoons on needles of 

 P. rig id a. Fig. 2. Felt 'i2h, p 368 



Itonid. Gouty pitch pine midge, Retinodiplosis inopis O. S. 



