398 Mr. 11. S. Bagnall on new Thysanoptera. 



Elaphrothrijos {Idolothrips) antennalis, sp. n. 



S . — Length about 3"7 mm. 



Colour bliickisli-brown, with tlie fore-femora distally niul 

 all tarsi lighter ; antennal joints 3 and 4 yellow, with tiie 

 a|)ical two-tifths or thereabouts of 4 light brown; 5 yellow in 

 the ba?al liaU'. 



Form much as in the North-American species Idohtlirips 

 tnherculatus t^udjlavipes, Hood. Head much as in flavipes, 

 just upon twice as long as broad j cheeks with several short 

 spines ; postocular bristles set well in and close to the eyes, 

 long and slender, at least 1*5 times the length of an eye. 

 Fir.st anteinial joint stout com))ared to 2 ; the elongale-clavate 

 segment 3 peculiar because of a rounded swelling of the inner 

 nargin in the neighbourhood of the basal third; relative 

 lengths of the joints 3 to 8 approximately as follows : — 

 49 : 46 : 40 : 28 : 19 : 18. Trichomes long and very slender. 



Pronotum about 0'45 the length of the head, transverse, 

 and twice as broad as long. Mid-lateral and postero- 

 nmrginal bristles at least well-developed, but difficult to make 

 out in the preparation ; pale. Outer postfero-marginal about 

 0*85, the inner pair shorter and moie slender, and the mid- 

 lateral 0*5 the median length of the pronotum. Fore-legs 

 not very strongly incrassate, fore-tar.sus armed with a broad- 

 seated tooth. Wings practically colourless, broad, and 

 reaching to the sixth abdominal segment; fore-wings with a 

 series of thirty-five duplicated cilia. Pterothorax broad. 

 Abdomen heavy, broader than the pterothorax, and gradually 

 narrowing from the fifth segment. Tube about 0"9 the 

 length of the head ; somewhat heavy, with side subparallel 

 to the distal third, whence it narro\\s sharply ; about 0"65 as 

 wide at tip as across middle. Terminal hairs weak, approxi- 

 mately 0*65 as long as the tube. Abdominal bristles long, 

 light yellow in colour, the longest on segment 9 as long as 

 the tube. Ninth sternite (or pleurites?) apparently produced 

 in the form of a pair of blunt spine-like processes, one on 

 each side of the tube. 



The siiape of the third antennal joint is a peculiar feature 

 of this species. 



Ti/pe. In Coll. Bagnall. 



Hah. Japan, Kobe; 1 (J, 11. vii. 1916, on grass {J. E. A. 

 Lewis), lieg. no. 293. 



