SOME NEW AND LITTLE-KNOWN EXOTIC THVSANOPTERA 537 



Bagnall, Diiiothrips Bagnall, and Alacliatothrips Bagnall, but 

 differs in certain negative characters from members of either 

 of these genera. 



From Macrothrips the male differs by its simple, non- 

 foveolate prothorax, and the simple fore -coxae, fore-femora, 

 and fore-tibife; from Dinothrips by the absence of the bifurcate 

 mesothoracic projections, and from Machatothrips by the simple 

 fore-femora. 



The species named below is smaller than any described 

 member of the group referred to above. 



Type. — Adiaphorothrips simplex mihi. 



Adiaphorothrips simplex sp. n. (PL xiv., figs. 23-24). 

 ^. Length 5*0 mm. ; breadth of mesothorax o'875 "^'^• 

 Colour very dark brown, almost black ; tips of third and 



fourth antennal segments lighter, and fore-tibiae and tarsi 



reddish brown. 



Head about one and three-quarters as long as wide behind 

 eyes, depressed, narrowed a little behind eyes, roundly 

 broadened at basal third, and slightly constricted at base ; 

 apex narrowly emarginate between basal joints of antennae, 

 and cheeks set with several strong spines. Eyes finely facetted, 

 occupying about one-quarter the total length of head ; post- 

 ocular spines long. Ocelli equidistant, moderately large ; 

 posterior pair on a line drawn through centre of eyes, and not 

 touching their margins. Antennae inserted at apex of head 

 and below vertex ; joints six to eight absent in type, but the 

 antenna altogether evidently at least twice as long as head; 

 intermediate joints much elongated, fourth and fifth joints each 

 three-quarters as long as the third and fourth respectively. 



Prothorax about two-thirds the length of head, and nearly 

 one-half as long as broad ; surface convex, smooth, and 

 shining ; all spines excepting the anterior-marginal apparently 

 present, short. Fore-femur strongly inflated, tibia stout, and 

 tarsus armed with a long, strong tooth. Pterothorax trans- 

 verse, broader than prothorax, and three-quarters as long as 



