BY R. J. TILLYARD. 361 



superior 3 mm, slightly wavy, black, pointed; inferior l"8mm., 

 brown, narrow subtriangular, tip upcurved (see Plate vii., figs. 8a 

 and b). 



Q. Sliglitly different from male. Wings often much suffused 

 with brown; pterostigma pale brown; anleclypeus with small 

 triangular creamy spot. Abdomen thicker than in male, cylin- 

 drical, rather short, 2-7 spotted as in male, 8 with smaller spots, 

 9-10 brown; colour of spots and thoracic stripes usually dull 

 creamy. Ovipositor almost obsolete, being represented by a very 

 small projection under apex of 8 ; appendages 1 mm., black, 

 straight, pointed (see Plate vii., tigs. 21a and b). 



T y p e - s e r i e s : Coll. Tillyard, (J 9 (Margaret River, W. A.). 



Ilab. — Scattered localities in South-Western Australia. Mar- 

 gai'et River, Armadale, Waroona (a series from the latter locality 

 taken by Mr. G. F. Rerthoud). Inhal)its small running brooks. 

 December and January. 



Easily distinguished from all otliers of the genus by its small 



size, pale bluish markings, and the tuft of hairs under segment 8 



of male. Allied to S. claviculata in the reduction of its ovipositor, 



and in possessing antehnmeral thoracic stripes, but not in other 



respects. 



Genus 2. M E T a t h e M i .s, n .g. 



Membranule present; front large; abdomen (except in M.nigra) 

 not much pinched at 3, broadened at 8-10. Superior appendages 

 of male short, more or less forcipate, inferior nearly as long. 

 Females with tip of abdomen rounded, no ovipositor, 9-10 not 

 reduced in depth, but short. Larvae with a conspicuous frontal 

 plate, flat and semicircular, projecting in front between tlie eyes; 

 build rather stout. Type : Synthemis guttata Selys. 



Key to Species of Metathemis (both sexes.) 



1. I A pair of antehuineral thoracic stripes, yellow M.virgula. 



( No antehumeral thoracie stripes 2. 



2. 1 Four distinct white or yellow spots at wing-bases 3. 



( No spots on wing-bases M. guttata. 



o f Lateral thoracic stripe entire M. nigra. 



\ Lateral thoracic stripe cut in two, irregular M.hreristyla. 



