272 Mr. R. S. Bagnall on new Thysanoptera. 



lefroyi, Bagn., and set on tubercles ; the inmost pair longer, 

 stouter, and on a higher plane, another pair more widely 

 spaced and close to posterior margins (on account of the 

 lateral view it is impossible to say where there are one or 

 two pairs in this posterior series, but I am almost certain 

 there is only one pair). 



Type. In Coll. Bagnall, University Museum, Oxford. 



Hah. Canada, Semans, Sask., Aug. 4, 1917, 1 ? and 

 1 $ in injured wheat-stems (A. E. Cameron). 



This species is easily separated from E. obscurus, Mull., 

 and E. badius, Williams, by its coloration and from E. 

 secticornis (Tryb.) by the 3rd antenna] joint and the structure 

 of the 5th and 6th joints in which E. cameroni agrees with 

 obscurus. I have pleasure in naming the species after 

 Dr. A. E. Cameron, of the Entomological Branch of the 

 Canadian Dept. of Agriculture, who discovered it whilst 

 investigating wheat-pests. 



Genus Limphysothrips, nov. 



General appearauce of Physothrips and, although the 

 antennpe are broken in the unique preparation, it will almost 

 certainly be found that the style is two-jointed. 



Pronotum with two long bristles at posterior angles. Fore- 

 tibiae unarmed. Both veins of fore-wing regularly set with 

 long bristles. 



Tenth segment divided dorsally and armed with a very 

 stout pair of dorsal spines at apex as in Limothrips. 



Differs from all genera excepting Limothrips in the pre- 

 sence of the strong spines of the tenth abdominal segment. 

 It further differs from Physothrips in the chgetotaxy of the 

 fore-wings and from Odontothrips in the unarmed fore-tibia. 

 From Limothrips it differs in the general character of the 

 wings, head, and prothorax, and in the absence of the 

 additional stout spines present in the eighth abdominal seg- 

 ment of that genus. 



Type. Limphysothrips paradoxus, mihi. 



Limphysothrips paradoxus, sp. n. 



With the characters of the genus. 



$ . — Length c. 1*3 mm. 



Colour brown, wings with a yellowish tinge ; fore-femora 

 yellowish distally, fore-tibipe and all tarsi yellowish ; inter- 

 mediate and hind tibia? yellowish at extremities. Basal joints 



