406 ON THE GENUS CORDULEPHYA, 



1. In the two inner folds, the upper tooth is much larger, 

 sharper and more prominent in Cordulephya than in Syn- 

 themis. 



2. In the two outer folds, the outer lateral edge of the 

 tooth cari'ies only three minor teeth or serrations, whereas in 

 Si/iif/ie//iis there are four or five. In this latter respect, the 

 gizzard of Cordulephya differs from those of all other Libellu- 

 lid(g, which I have examined. I know of no other gizzard 

 with less than four serrations, and some have as many as six 

 or seven. (The figure in the plate is the gizzard of C. montana 



X 20). 



As the form of the gizzard is practically constant through- 

 out the Lihelhdidie, it is clear that these two differences, 

 small as they are, shew that (Jnrdide'phya and Synthemis are 

 not closely allied, — a conclusion which a comparison of both 

 larva and imago in every detail will manifestly strengthen. 

 On the other hand, the gizzard of Cordule'phya resembles that 

 of H emicordulia Urn very closely, though the latter, of larger 

 size, possesses four serrations, instead of three, on the lateral 

 edge of the single tooth in the outer fold. 



The Position of Cordulephya in the Subfamily Cordnlihuc. 



The four main groups of the subfamily Corduliijuf, have 

 been already pointed out in two previous papers,* 



Group i. Eucordulina. Larva smooth, with large head and 

 thorax, long legs, labium of Lihelluline form, i.fi., with lateral 

 lobes possessing shallow crenations along outer edge, with surface 

 marked with small warts and dots, and with numerous mental 

 and lateral setae. 



Imago usually of strong flight, with robust head and thorax, 

 long legs, usually cordiiliform abdomen; wing-venation with large 

 triangles and subtriangle (of forewing), usually crossed, complete 

 or practically complete recession of hindwing-triangle, and 

 elongated anal loop, shewing a definite longitudinal bisector. 



♦" Monograph of the Genus " Synthemi»," These Proceedings, 1910, 



XXXV., p.3'i8. "Farther Notes on some rare Australian Cordulii7iai" 



These Proceedings, 1911, p.384. 



