65 



EXPLANATION OF PLATES. 



The cuts of Plate I have been obtained through the kindness of Mr. 

 W. E. Britton, State Entomologist of Connecticut, who has used them in 

 Bulletin 140 of the Connecticut Agricultural Experiment Station, and in 

 his Second Report of the State Entomologist. 



PLATE I. 



* 



Fig. A : Aleyrodes vaporariorum ; early stages on tobacco leaf. En- 

 larged about four times. 



Fig. B : Aleyrodes vaporariorum ; adults and pupa skin on tobacco 

 leaf. Enlarged four times. 



PLATE II. 



Aleyrodes vaporariorum. 



Figs. 1 and 2 : Eggs. 



Fig. 3 : Dorsum of first instar. 



Fig. 4 : Venter of first instar. 



Fig. 5 : Vasiform orifice of first instar. 



Fig. 6 : Dorsum of second instar. 



Fig. 7 : Venter of second instar. 



• Fig. 8 : Right antenna of second instar. 



PLATE III. 



Fig. 9 

 Fig. 10 

 Fig. 11 

 Fig. 12 



Fig- 13 

 Fig. 14 



Aleyrodes vaporariorum. 



Right hind leg of first instar, from below. 



Vasiform orifice of second instar. 



Venter of third instar. 



Dorsum of third instar. 



Vasiform orifice of pupa. 



Legs, antennas arnd mouth parts of pupa. 



Fig. 15 

 Fig. 16 

 Fig. 17 : 

 Fig. 18: 

 Fig. 19: 

 Fig. 20 

 pupa case. 



PLATE IV. 

 Aleyrodes vaporariorum. 



Side view of pupa. 



Dorsum of pupa. 



Right hind tarsus of adult female. 



Margin of wing of adult. 



Abdomen of male from the side. 



Abdomen of female from the side, soon after emergence from 



