502 



Mr. R. S. Bagnall on new Thysanoptera. 



Ihib. W. Australia; 1 ? taken bj Professor E. B. 

 Poulton, F.R.S., witli examples of Isoneurothrips austvalin, 

 sp. 11., from the flowers of a small tree of Acacia9\^. (prol)ably 

 A. hailej/atio, F. v. Miill.), Muiularing Weir, Durlin>^ 

 Range, Perth, August 3rd, 1914 (tube l(i). 



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

 which is regularly set with setoc — a character generally 

 regarded as of generic importance. 



B. Thrips group. 



Genus Isoneurothrips, nov. 



With all the characters of Thrips { + Bac/nallia), but 

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

 set with seta3 as well as the lower. 



Tj'pe. Isoneurothrips australis, mihi. 



a. Thrips s. str. type. 



IsoneurotlirijJS australis, sp. n. 



? . — Length 1*4 mm. 



General colour yellow, with dark setse. Head only lightly 

 tinged with grey, vertex brownish ; pronotum yellowish- 

 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 

 with setse and cilia dark. Eyes black and ocelli with crimson 

 liypodermal crescentic margins. Head transverse, about 0'7 

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

 facetted, pilose. Some short, erect, genal setai behind eyes 

 and a dorsal series approximately on a line behind eyes. 



AnteunaB about three times as long as the head ; tirsf joint 

 yellow, second grey-brown, third yellowish, irregularly 

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

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

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

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

 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 

 lengtii of the pronotum, stout and almost black ; a scries of 

 shorttr jjosteru-marginal seta^. Surface sparsely and minutely 



