1919 



ENTOMOLOGICAL SOCIETY. 



87 



Colour notes: Predominating colour red. Antennae yellowish brown; 1, 11 

 reddish; tips black. Head crimson, mesal suture and a spot on either side black. 

 Eyes dark red. Thorax crimson with black markings. Abdomen crimson with 

 five black transverse bands. Legs pale yellowish brown. Front wings faintly 

 clouded with yellow, veins pale yellowish brown, hind wings transparent. 



Mating Hahifs: The female mates several times, and the male is pol3fgamous. 



In copulating, the male gets along side the female on her right side, lifts 

 his left wing to some extent, grasps the upper genital plate with his claspers and 

 inserts the penis. 



Preoviposition Period of Female: The average preoviposition period of con- 

 fined females was 4 days in 1917 and 6 days in 1918, the minimum and maximum 

 for both seasons being 3 days and 9 days respectively. 



Reproductive Capacity of Female : According to our observations, one female 

 may lay from 1 to CA e^g» per day. 



Fig. 19. — Adult pear psylla. 

 (Much enlarged.) 



Fig. 20. — Abdomen of "a" 

 male, and " b " female pear 

 psylla. (Much enlarged.) 



In our experiments the maximum production per insect was 695 eggs and 

 the minimum 65 eggs. (See Table No. 5). 



TABLE No. 5. 

 Showing Comparative Reproductive Capacity of Summer and Overwintering Females. 



Year. 



Generation 

 (Summer). 



Number 



of Couples 



used. 



Egg Laying 

 Period. 



Reproductive Capacity 

 of Female. 



Max. 



Min. 



Aver. 



1917.... 

 1918.... 

 Average 

 1917 . . . . 

 1918.... 

 Average 

 1918.... 

 1917.... 



1st 

 1st 

 1st 

 2nd 

 2nd 

 2nd 

 3rd 

 Winter 



7 

 5 



12 



10 



5 



15 



June 19— Aug. 14. 

 June 7 — July 25. 

 June 7 — Aug. 14. 

 July 23— Sept. 4. 

 July 18— Sept. 10. 

 July 18— Sept. 10. 

 Aug. 15 — Oct. 5. 

 April 12 — June 13. 



Eggs 

 671 



695 



695 



684 



636 



684 

 285 

 448 



Eggs 



427 



459 



427 

 65 



»258 

 65 

 86 



121 



Eggs 

 540 



625 



582 



343 



456 



399 



191 



279 



