THYSANOPTERA 



91 



Suborder TUBULIFERA 



Those thrips which lack the saw-like ovipositor are not of great eco- 

 nomic importance in our country, at least. One of the more common forms 

 is the mullein thrips, Neoheegeria verbasci, the black individuals of which 

 may usually be found in numbers during the fall among the rosettes of 

 woolly leaves of our common mullein. 



The camphor thrips, Cryptothrips floridensis , is particularly abundant 

 in Florida, where it is injurious to the camphor tree, especially to those 

 individuals that have been cut back or pruned severely. 



Fig. 141a. — Trillium. 



One of our fine, large species of thrips, Ctenothrips bridwelli, is found 

 on trillium and mandrake. 



