398 ]\lr. R. S. Bagnall on neio Thysanoptera. 



Elaphrotlirijis (Idolothrips) antennalis, sj). n. 



(?.— Length about '61 mm. 



Colour bliickish-brown^ with tlie fore-femova distally and 

 all tarsi lighter ; aiitetnial joints 3 and 4 yellow, with tlie 

 apical two-tifths or thereabouts of 4 light brown; 5 yellow in 

 the ba?al half. 



Form much as in the North-American species Idolotlirips 

 tuherculatus and Jlavipes, Hood. Head much as in flavipes, 

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

 s|)ines; postocular bristles set well in and close to the eyes, 

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

 Fii-.st anteinial joint stout com])ared to 2 ; the elongate-clavate 

 segment 3 peculiar because of a rounded swelling of the inner 

 margin 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- 

 nuirginal bristles at least well-developed, but diflScult to make 

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

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

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

 not very strongly incrassate, fore-tarsus 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 pterotliorax, 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 narrows 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 shape of the third auteinial joint is a peculiar feature 

 of this species. 



Type. In Coll. Bagnall. 



Hah. Japan, Kobe ; 1 cJ, H. vii. 1916, on grass (/. E. A. 

 Leiois). Reg. no. 293. 



