BY R. J. TILLYARD. 647 



The three species Nannophlebia Lorquini Selys, N. imitans 

 His, and N. eludens, n.sp., are very closely related, but may be 

 distinguished as follows : — 



iV. Lorquini has the base of its front in the male very largely, 

 in the female somewhat more narrowly, metallic greenish-black. 

 N. imitans has the front metallic greenish-black above. xV. 

 eludens has no metallic colour on front. N. imitans has no yellow 

 on the dorsal ridge of thorax; N. Lorquini has a very fine yellow 

 line; so has N. eludens. 



N. imitayis has the abdomen all black except a yellow ring on 

 2. N. Lorquini has the abdomen similar to N, eludens £. 



It is very probable that these three species are only geographical 

 subspecies of one widely distributed and exceedingly variable 

 species. The Australian form is, however, sufficiently distinct 

 and constant to merit a new name. I have named it iV. eludens 

 because of its peculiar elusive zigzag flight up into the air when 

 disturbed from its usual rest on a favourite twig. 



8. Tktrathemis cladophila, n.sp. (Plate xiv., fig.5). 



(J. Total length 25 mm.; abdomen 16-5 mm.; forewing 21mm.; 

 hind wing 19*5 mm. 



Wings: neuration fine, black; basal half to nodus slightly 

 suffused with dull yellow; pterostigma 1*6 mm., rather broad, black; 

 membranule nil; one cross-nervule in hypertrigonal spaces, 3-4 

 submedian nervules. Nodal Indicator ||8 5 He&d:eyes 

 dark brown; vertex dark metallic green, j'7 4-5 front ocellus 

 transparent, pink; front cleft medially, downy, orange-yellow; 

 clypeus dirty glaucous-grey; labrum black; labium pale straw- 

 colour; mouth edged with brown. Thorax: prothorax pale 

 dirty brownish. Meso- and metathorax very dark steely metallic 

 green above; on each side a subhumeral blotch of yellow placed 

 very far forward, somewhat narrowed or pointed behind; sides 

 greenish-yellow with a brown band in the pleural suture; interalar 

 ridge, scuta and scutella yellowish or brownish. Legs black, 

 tibise with long cilia. Abdomen short, cylindrical; 1-2 yellow, 

 an anal transverse black band on 2 and base of 3; rest of basal 



