Mr. R. S. Bagnall on new Thysanoptera. 215 



explanate lateral margins of the prothorax, in the simple 

 anteiinal style and the structure of fore-wings, which are 

 without setae and cilia on the costa. 



Australothrips bicolor, sp. n. 



? . — Length about I'l mm. 



Orange-yellow ; head, prothorax, mesothorax, scutular 

 area, and sides of metathorax dark chestnut-brown ; fore and 

 intermediate femora dark brown ; hind-femora and fore and 

 intermediate tibias lightly tinged with brown. Antennte with 

 joint 6 apically and style brown; first joint lightly tinged 

 with brown. Scale of fore-wing, small patch adjoining, and 

 mid- vein and cilia of hind-wing brown. 



Head about 1'8 times as broad as long, cheeks slightly 

 converging, and hind angles prominent ; network reticulation 

 of surface strong, especially below an arcuate raised line 

 behind eyes. Eyes prominent, space between them about 

 twice the width of an eye. Vertex sinuate on each side of 

 raised part, having the antennae, which are twice as long as 

 the head, seated in the sinuations. First antennal joint 

 short; second quadrate, with distal cup-shaped holJow for 

 reception of 3; 3 long, claviform, constricted at apex ; 4 and 

 5 cylindrical, with minute stem, and 4 also narrowly con- 

 stricted at apex; 6 broadest basally; 7 and 8 together styli- 

 form, and the relative lengths and breadths as follows : — 



16 : 34 : 48 : 28 : 24 : 22 : 8 : 13 

 20 : 30 : 16 : 17 : 17 : 14 : 7 : 5 ' 



Prothorax as long as or only slightly longer than the head, 

 and (excluding the lateral explanate margins) as broad as 

 the head. Legs comparatively short and stout. 



Posterior margins of abdominal tergites with more or less 

 regularly placed, minute, blunt projections ; setaj on segment 9 

 short and those on 10 very short, colourless. 



(^ . — Smaller, more slender. Lemon-yellow where orange- 

 yellow in ? . Tergite 8 set with four long and rather stout 

 spines set on an arcuate series of tubercles. 



Type. Hope Department of Zoology, University Museum, 

 Oxford. 



Hab. Australia, Healesville, Victoria; on Eucalyptus 

 viiniaalis (R. Kelly). 



15* 



