Explanation of Plate. 



Fig. 1. Full-grown larva. ^-^ 



Fig. 2. Pupa, cl? 



Fig. 3. Wingless adult female. ^-^ 



Fig. 4. Winged adult female, ^-f' 



Fig. 5. Head of Kentucky blue-grass normally developed^. 



Fig. 6. Head of Kentucky blue-grass arrested in its growth by the 

 attack of the grass thrips, also showing the shrivelled 

 condition of the stem just above the upper node. \ 



Explanation of the Lettering of Figures in the Plate. 



Ant. Antenna. 



Bl. Bladder terminating the tarsus. 



Bs. Base of stem of Kentucky blue-grass, taken from just above 



the upper node, injured by thrips. 

 CE. Compound eye. 

 FL. Fore leg. 

 FWp. Fore wing pad. 

 H. Head. 

 HL. Hind leg. 

 HWp. Hind wing pad. 

 L. Ligule. 



