52 



THE REPORT OF THE 



No. 36 



eggs on nine marked leaves is shown. Nos. 1 to 3 were old leaves in which the 

 earliest egg would be deposited; Nos. 4 to 9 were younger leave's: 



Table No. 1, Showing Duration of Hatching Period of 1st. Brood Eggs. 



Date 



L 



gaf L 



gaf L 



gaf Leaf 



Leaf 



Leaf Le 



af 



Leaf Le 



af 





N 



3. 1 N 



3. 2 N< 



3. 3 No. 4 



No. 5 



No. 6 Nc 



. 7 



No. 8 No 



. 9 



June 20 





3 



3 



1 













21 





8 



9 



6 

















22 



] 



1 ] 



3 ] 



7 

















23 





7 



9 



8 

















24 



1 



9 



5 1 



6 

















25 





!2 1 



7 ] 



8 6 



'8 



'8 











26 





7 



9 



4 12 



16 



10 











27 





!3 1 







9 8 



12 



12 











28 





!0 ] 



li : 



>2 11 



18 



16 











29 



] 



9 ] 



L7 j 



17 



12 



21 











30 





;i : 



21 1 



6 28 



22 



17 



6 



9 



2 



July 2 



i 



t8 ; 



59 : 



51 57 



29 



31 



5 



8 



7 



3 



i 



t6 < 



t5 : 



28 44 



38 



45 1 



8 



11 



9 



4 



1 



4 j 



Ll ■ 



8 45 



20 



61 2 



6 



18 1 



7 



5 



1 







4 



3 20 



19 



16 1 



2 



18 2 



7 



6 





6 



8 



5 41 



13 



26 



6 



8 1 







7 









26 



13 



9 



5 



2 



4 



8 









8 



10 



26 



7 



8 1 



4 



10 









17 



21 



14 1 



8 1 



3 



11 









6 



4 



7 



3 



7 



6 



12 









7 



5 



3 



6 



6 



7 



13 









7 



10 



8 



7 



5 



6 



14 









5 



4 



4 



6 



3 



7 



15 









3 



3 



6 



4 



3 



4 



17 









9 



9 



12 1 







1 



2 



18 













2 



2 



3 







2 



19 

















3 



3 







3 



20 

















3 



2 







1 



21 













5 



8 



1 







4 



22 









9 



4 



5 



2 











24 









6 







3 















Totals — 



31 



4 2; 



il 2( 



)2 503 



287 



376 14 



-2 



114 14 



5 



Eggs of the second brood commenced to hatch about August 15th, and all 

 had hatched by September 10th. 



The Nymph. 



Like other species of Cicadellidce the grape leaf-hopper passes through five 

 nymphal stages, or in other words it moults five times. Descriptions of the 

 five nymphal instars are presented herewith: 



First Instar. Size .79 to .84 mm. long by .25 mm. to .27 mm. wide. Body 

 very frail and soft, translucent white with crimson eyes; head and thorax 

 slightly broader than the abdomen which tapers to the caudal end; antennae, 

 thread-like; legs, translucent white; wing pads absent. 



Second Instar. Size 1.36 mm. to 1.45 mm. long by .32 mm. to .36 mm. 

 wide. Same as first instar except: Body creamy white, eyes becoming pearly; 

 abdomen nearly as broad as thorax ; light-yellow irregular spot toward the lateral 

 margins of each thoracic segment, continued on to the head behind each eye; 

 wing pads beginning to appear. 



Third Instar. Size 1.72 mm. to 1.80 mm. long by .50 mm. to .55 mm. 





