NEW GENERA AND SPECIES OF THYSANOPTERA 187 



Species large and massive ; head with the cheeks proficsely set 

 with spines; prothorax more or less raised to posterior edge; 

 wings invariably present. 



I. ^/;6' larger (7-12 mm ) ; prothorax strongly raised to posterior edge ; 



fore-femora simple or with but a single broadly seated blunt tooth 

 at the base within, and each fore-tarsus armed with a single long 

 and broad tooth : 



a. Prothorax strongly sculptured ; fore-eoxa produced in the 



form of a simple, curved or geniculate horn ; anterior angles 



of mesosternuin simple. 



Genus Macrothi'ips Bagnall 



b. Prothorax smooth and shining ; fore-coxa simple ; each 



anterior angle of mesosternum with a peculiar lateral 



bifurcate projection. 



Genus Dinothrips nov. 



II. Size smaller (less than 7'0 mm.); prothorax slightly raised to 



posterior edge ; eB.c\\ fore- femur within armed with a series of long 

 aCute teeth, and e^.c\i fore-tarsus with two small spurs. 



Genus Machatothrips nov. 



Genus MACROTHRIPS Bagnall 

 Table of species : — 



I. Size larger (10-12 mm.) ; fore-femora each with a large broadly 



seated blunt tooth at the base within ; fore-coxa abnormally pro- 

 duced : 



a. Head longer, with a strong backwardly and laterally curved 

 spine- set protuberance behind each eye ; fore- coxa produced 

 in the form of an elbowed or geniculate horn ; fore-legs more 

 massive : fore-tihicc each with a strong thorn-like tooth at 

 apex within and another a little behind apex ; ticbe three 

 times the length of the ninth abdominal segment. 



papuensis Bagnall 



h. Head shorter and stouter ; post-ocular protuberance obsolete ; 

 fore-coxal projection not geniculate but curved forward ; 

 fore-tibia with pair of small teeth (side by side) before the 

 apex within ; tube four times the length of the ninth 

 abdominal segment. 



intermedia sp. nov. 



II. Size smaller (7 mm ) ; fore-femora simple zxid. fore- cox iX simply pro- 



duced, dubia Bagnall 



The three known species are from New Guinea. 



