BY R. J. TILLYARD. 707 



However, there is in some ways a very close resemblance between 

 Nos.2 and 6, though the value of the comparison is lost for us, 

 as sj'stematists, by the evident differences, in other respects, 

 between both nymphs and imagines of the Gomphince and 

 Phyllopetalia. In the jEschnince {^gnA and 5) the usual form of 

 the inner margin of the lateral lobe is the more or less squarely 

 truncated end as shown in fig. 4. But that other forms are still 

 extant, may be seen in Gg.o (Staurophlebia reticulata Burm.), 

 where both the large outer tooth and the smaller tooth of the 

 inner margin are sharply pointed, 



A further argument in favour of the similarity between the 

 labial development of Phyllopetalia dud that of the jEschniiim will 

 be forthcoming on the publication by me, later on, of the life- 

 history of Telephlebia yodeffroyi Selys. The material for thi* 

 paper is not yet worked up, but I am able to state that the 

 labiura of this remarkable piiinitive ^Eschnine form shows an 

 even closer resemblance to that of Phyllopetalia than do any of 

 the labia figured in the text. 



To sum up, it seems to me that Phyllopetalia and Cordidey aster 

 are by no means closely allied. In their nymphal stages the 

 members of the latter genus exhibit remarkable structural differ- 

 ences from all the rest of the jEschnida^, and should probably be 

 separated out as a subfamily by themselves, and connected more^ 

 closely to the Cordidiince by way of Macromia and Synthemis. 

 Phyllopetalia, on the other hand, is probably less closely allied to 

 Cordidegaster even than Fetalura is, and must at any rate be 

 removed from the Cordidegasteriiice. In my opinion, i&s correct 

 position should be in the ^Eschninoi proper, next to I'elephlebia, 

 thus including in this subfamily all those genera in which the 

 ovipositor of the imago is a true terebra or " borer." 



As regards the nymphs., the following key will now serve to 

 separate them : — 



, I Antennaj 4-jointed Gomphinw. 



\ Antennae 7-joiuted 2. 



(Labium with mental and lateral set«, small ter- 

 minal movable hook, and large irregular serra- 

 tions on inner margins of lateral lobes CordtdegasterirKX. 

 Labium with no setse, large terminal tooth, little or 

 no crenation of inner margin. 3. 



