RHYNEHAitT — Life-Histortj and Bionomics of the Flax Flea-Beetle. 539 



EXPLANATION OF PLATES. 



Plate XV. 

 Fig. 



1. Photograph of flax seedlings, showhig early effect of flea-beetle attack. 



(Natural size.) 



2. Cotyledons of a seedling enlarged to show the holes and notches made by 



the beetles, (x 3.) 



3. An enlarged photograph of a seedling, showing the central bud eaten. 



(X 3.) 



4. Photograph of older seedlings, showing the general effect of an attack. 



(Natural size.) 



5. Enlarged photograph of an older seedling after a severe attack, (x 3.) 



Plate XVI. 



6. Eggs of Longitarsus parvuhcs. (x 75.) ps, pad of sticky substance often 



present at the end. 



7. Portion of the egg-surface very highly magnified. 



8. Egg after hatching, (x 85.) ea, emergence aperture of larva. 



9. Newly hatched larva, (x 122.) 



10. Second stage larva; dorsal view, (x 50.) |?rs, prescutum ; sc, scutum; 



scut, scutellum. 



11. Second stage larva; lateral view, with cuticle cleared, (x 50.) 



12. Dorsal view of thorax of mature larva, showing the arrangement of the 



bristle-bearing plates, (x 70.) su, pronotal suture; P, prothorax; 

 Ms, mesothorax ; Mt, metathorax. 



13. Ventral view of thorax and first abdominal segment of mature larva, 



showing the sternal plates. Legs removed, (x 70.) P, prothorax ; 

 Ms, mesothorax; Mt, metathorax; Al, first abdominal segment. 



14. Plan of bristles and bristle-carrying plates of abdominal segments one to 



eight. Drawn from third abdominal segment, (x 70.) J/Z*, mid-dorsal 

 line; MV, mid- ventral line: jjts, prescutal plates and bristles; 

 sc, scutal plates and bristles ; scut, scutellar plates and bristles ; 

 al, alar plate and bristles ; sp, spiracular plate and spiracle ; ep, epi- 

 pleural plate and bristles ; hyp, hypopleural plate and bristles ; 

 st, sternal plates and bristles. 



SCIENT. PROC, R.D.S., VOL. XVI, NO. XXXIX. 3 L 



