DESCRIPTION OF THE PLATES 261 



PLATE IV 



FIG. 



1. Gall in an oak-bud arising through the presence of the larvae of 



Biorrhiza pallida. ( J.) 



2. Ditto. (J.) 



3. Biorrhim pallida 3- (JO 



4. Ditto ?. (5.) 



5. Galls of Bioj-yted a*<«w on oak-root. (J.) 



6. Ditto, section. [\!) 



7. Section, (f.) 



8. Section, with wasp emerging. (^,) 



9. Biorrhiza aptera. (J.) 



PLATE V 



1. Galls of Neuroterus baccarum on staminate flowers of the oak. (J.) 



2. Section of a gall. (^.] 



3. Neuroterus baccarum ? . (|.) 



4. (a) (a) Ga.\ls oi Neuroterus lenticttlaris. (J.) 

 (6) (A) Ditto ol Neuroterus fumipennis, (J.) 



5. Section of gall of N. lenticularis. (f .) 



6. Early stage of gall of N. lenticularis. (f .) 



7. Neuroterus lenticularis. l^.) 



8. (c) Gall of Neuroterus vesicator. (J.) 

 (rf) Ditto of N. albipes. (i.) 



9. (e) GaMs oi Neuroterus numismatis. (J.) 

 (/) Ditto of W. ZflmMsc«?MS. (J.) 



10. Section of gall of N. laeviusculus. (J.) 



11. GaXXoi Neuroterus vesicator. (\.) 



12. Section of gall of N. numismatis. (f.) 



13. Gall of N. numismatis. (|,) 



14. GaXloi Neuroterus tricolor. (J.) 



15. Section of gall of N£u>'o^«>'!u /ttmz/cwnis. (f.) 



PLATE VI 



1. Normal fiower-spike of Ptete^o werfjir. (f.) 



2. Flower-head of P. weiia galled by larva of J/^ciwMi /lyrasfe*'. (|.) _ 



3. Mecinus pyraster. (f.) 



4. Gall caused by larvae of Ceuthorrhynchus hirtulus on root of Erophila 



verna. (\.) 



5. Ceuthorrhynchus hirtulus. (f .) 



6. Gall of C. hirtulus. (f.) 



7. Branch of Populus tremiUa attacked by Saperda populnea. (J.) 



8. Ditto, with galls caused by the presence of the larvae of Saperda 



populnea. (J.) 

 g. Sciperda populnea %. (|.) 



10. Ditto S. (f.) 



11. L,a.Tva. oi S. populnea. (f.) 



