Entomological Socictij of Britisli Cohouhia 53 



1. Fore femur in the male on inner side with a row of teeth. Female 

 unknown. 

 2. Teeth of fore femur large and slender, taji-shaped. Fore tarsus with 



two little teeth Machatothrips Bagnall 



2. Teeth of fore femur small and liumij-like. Fore tarsus with a 

 powerful tooth. 



3. The end of the fore tibia with a tooth-like process 



Ischyrothrips Sehmutz 



3. Fore tibia unarmed Eulophothrips Sehmutz 



IDOLOTHRIPIDAE 



1. Second to the eighth abdominal segments with a tooth. Tube les.s 

 than five times as long as the ninth abdominal segment. 

 2. Head projecting not at all or only a little beyond the eyes; fore 

 angles of the prothorax and fore femur iniarmed. Tube longer than 

 the 9tli abdominal segment. 



3. Head shorter. Cheeks without thorns. I'rothorax clearly slant- 

 ing without sculpturing or little humps. Tube at least four 



times as long as the 9th abdominal segment. 



Gigantothrips Zimmerman 



3. Head longer. Cheeks set with more or less strong thorns. Pro- 

 thorax with sculptures or little humps. Tube less than four 

 times as long as the 9th abdominal segment. 

 4. A strong sickle-shaped stunted bristle on the outside in front 



of the knee on the fore femur of the male. 



Dicaiothrips Buffa 



4. Fore femur of the male without sickle-sjiaped bristles. 



Elaphrothrips Buffa 



2. Head projecting far in front of the eyes. The end of the fore 

 femur in front usually with a tooth. 



3. Tube not at all or only a little longer than the 9th abdominal 

 segment. 



4. Fore angles of the prothorax with a large thorn 



Mecynothrips Bagnall 



4. Fore angles of the prothorax unarmed Klinothrips liagnall 



3. Tube about three times as long as the 9th abdominal segment. 

 Fore femur (at least in the male) very much enlarged. 

 4. A strong blunt hump on the middle of the inner margin of 

 fore femur in the male. Fore tibia at the end armed with a 



sharply angular tooth Phoxothrips Karny 



4. The middle inner margin of the fore femur without little 

 humps. Fore tibia at the end only bluntly-angularly 

 broadened Kleothrips Sehmutz 



