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



Tlah. W. Australia; 1 $ taken bj Professor E. B, 

 Poulton, F.R.S., with examples of Isoneurothrips australis, 

 sp. 1)., from the flowers of a small tree of Acacia sp. (probably 

 A. haileyana. F. v. Miill.), Mutulariiig Weir, Darliug 

 Range, Perth, August 3rd, 1914 (tube 16). 



Differs from known species by the fore-vein of fore-wing, 

 wliich is regularly set with setoo — a character generally 

 regarded as of generic importance. 



B. Thrips group. 



Genus Isoneurothrips, nov. 



With all tlie characters of Thrips { + Bagnallia), but 

 having the whole of the upper-vein of tore- wing regularly 

 set with setas as well as the lower. 



Type. Isoneurothrips australis^ mihi. 



a. Thrips s. str. type. 



Isoneurothrips australis, sp. n. 



? . — Length 1'4 ram. 



General colour yellow, with dark setse. Head only liglitly 

 tinged witli grey, vertex brownish ; pronotum yellowisli- 

 brown ; pterothorax tawny, tinged with brown at margin. 

 Abdomen yellow, segments 9-10 wholly dark grey-brown, 

 other tergites light grey-brown and pleurites yellowish. 

 Legs yellow, tinged with grey. Fore-wings greyish-yellow 

 Avith setse and cilia dark. Fyes black and ocelli with crimson 

 hypodermal crescentic margins. Head transverse, about 0*7 

 as long as broad ; cheeks arcuate. Eyes prominent, coarsely 

 i'acetted, pilose. Some short, erect, genal setai behind eyes 

 and a dorsal series api)roximately on a line behind eyes. 



Antennse about three times as long as the head ; tirsl joint 

 yellow, second grey-brown, third yellowish, irregularly 

 tinged with grey-brown ; fourth and fifth rich purple-grey, 

 yellow basally, and 6 of the same rich colour in the basal 

 two-thirds, but with the apical third together with the style 

 light grey. Joints 3 and 4 fusiform, and together with 6 

 approximately subequal ; 5 much smaller and style very 

 short. 



Prothorax longer than head, bordered anteriorly; the two 

 prothoracic bristles at each hind angle about one-third the 

 lengtli of the pronotum, stout and almost black; a series of 

 shorter postero-marginal setie. Surface sparsely and minutely 



