42 Proceedings, 1922 



KARNY'S KEY TO THE PHLOEOTHRIPIDAE 



R. C. TREHEENE, Entomological Branch, Department of Agriculture, Ottawa. 

 A few years ago I placed before the members of the British Columbia 

 Entomological Society certain suggestions in key form to determine the 

 Aeolothripidae and I followed this with a similar key for the Phloeo- 

 thripidae. I was kindly allowed place on the programme of one of our 

 annual meetings for an explanation of this latter division of the Thysan- 

 optera. I did not at the time present my paper which I had then pre- 

 pared because I did not feel it was complete enough for issuance in our 

 Proceedings. I bad made an endeavour to separate and then to bring 

 together again the information on this group at that time in my posses- 

 sion. I am very glad indeed, however, that I did not present my paper 

 for publication for the reason that recently there has come into my pos- 

 session a very complete and excellent paper written by Dr. H. Karny, and 

 received direct from him at his laboratory at Buitzenzorg in Java. This 

 work covers the work I had attempted and is, from such an authority, a 

 most complete resume of our present knowledge of the Thysanoptera. 

 It appeared in Treubia, Volume I, Part 4, 1921, and I have to the best of 

 my ability translated this paper from the original German into English 

 and herewith present that part of it which has reference to the Phloeo- 

 thripidae, to the members of our Society for their information. 



PHLOEOTHRIPIDAE 



1. Cheeks set with bristle-bearing warts Phloeothripinae 



1. Cheeks without bristle-bearing warts. 



2. Cheeks not set throughout their entire length with thorn-like 

 bristles. 

 3. Head not much swollen towards the posterior margin. 



4. Mouth cone sharply pointed at end Liothripinae 



4. Mouth cone rounded at end. 



5. Wings narrowed in the middle, sole-like ; when absent, the 

 prothorax along the posterior margin is not much broader 



than the head Haplothripinae 



5. AVings reduced or not narrowed in the middle. Prothorax 

 along posterior margin clearly broader than the head. 

 6. Head not at all or slightly longer than the protliorax. 



7. Fore tibia unarmed Trichothripinae 



7. Fore tibia with a tooth on the inside extremity 



Kladothripinae 



6. Head clearly longer than the prothorax. 



7. Head seldom more than twice as long as wide, its 

 sides fairly regularly formed. Antennae not notice- 



