46 Proceedings, 1922 



2. Bristles of protliorax simple, sharp or clubbed at end, not funnel- 

 shaped. 

 3. Head pronouncedlj' broader than long. 



4. Head slightly tapering along the posterior margin. The 7th 



and 8th antennal joints together longer tlian tlie tliird 



Brachythrips Ileuter 



4. Head broadest along posterior margin. The 7th and 8th an- 

 tennal joints clearly separated from one another, each as long 



as the third Austrothrips Brethes 



3. Head as long as broad or longer. 

 4. Antennae 8-jointed. 



5. Posterior part of head broadest witli sides clearly tapering 

 towards the front. 



6. Abdomen not broader than tlie pterothorax 



Cecidothrips Kieffer 



6. Abdomen noticeably broad, mueli Ijroadcr than the 



pterothorax Eurythrips Hinds 



5. Head not broader along posterior margin. 



6. Abdomen with quite short, weak bristles or witli none. 

 7. Abdominal bristles present. Antennal joints not 



noticeably short and thick Gymnothrips Karny 



7. Abdominal bristles absent. The middle antennal 



joints noticeably short and thick Lispothrips Renter 



6. Abdomen covered sparsely with long bristles. 



7. Mouth cone as long as the vertex of the licad 



cf. Eurhynchotlirips Bagnall 



7. Proboscis pronouncedly shorter than tht^ rest of the 

 head. 



8. Fore tibia armed at the end with a tooth 



Plectrothrips Hood 



8. Fore tibia witliout teeth. 



9. Tube not noticeably short, without longitudinal 

 sutures. 



10. Labrum sharply pointed, rising above the 

 gently rounded off mouth cone. Antennae 



more than twice as long as the head 



Trichothrips Uzel 



10. Labrum blunt ; when not, the antennae are 

 less than twice as Jong as the head. 

 11. Fore femur in both sexes much thick- 

 ened cf. Mesothrips Zimmerman 



11. Fore femur (in both sexes'?) weak. 

 . 12. Head clearly longer than broad. 



