I92I.] 



F. F. Laidi.aw : Indian Dyaqonflies. 



■83 



2 and 3 this accessory carina lies at about the middle of the 

 segment, but on 4 — 8 becomes progressively more approximated 

 to its anterior end. I propose to call it the ' jugum ' ; that part 

 of the segment in front of it the prejugal part of the segment, and 

 that behind the post-jugal part. Further, the post-jugal part of 

 segments 4—8 can be subdivided by the presence on each of these 

 segments of the ventral longitudinal carinae, and of the accessory 

 longitudinal carinae into supra-carinal, inter-carinal and infra- 

 carinal areas on either side. The accessory longitudinal carinae 

 do not extend to the prejugal part of the segment. Whether the 

 ventral carinae mark the lateral margin of the tergite or no I am 

 not sure. If they do it would follow that the infra-carinal area 

 is formed on either side by the pleu- 

 rite. But on the whole I think that 

 this area is a part of the tergite. 



Lastly, it may be noted that between 

 segments r and 2 dorsallj- there is a 

 remarkable development of the inter- 

 segmental membrane. This brings it 

 about that there is a considerable gap 

 between the tergites of the two seg- 

 ments ; this gap is covered by the uni- 

 formly buif-coloured membrane. 



In some species of Anax, for ex- 

 ample in A. parthenope, this develop- 

 ment of the inter-segmental membrane 

 is much less ; but the character prob- 

 ably occurs to some extent in all, and 

 is possiblv of generic value. 



Series A. (Text-fig. 2.) 



The specimens belonging to this 

 series I believe to be fairly typical 

 examples of the true A . gnfiatus, Burm. 



I have been alole to compare them 

 with examples from Borneo, the Malay 

 Peninsula, and I have also seen speci- 

 mens from various localities in the 

 British xiiuseum. 



There are differences in details of 

 coloration, size and shape of the anal 

 appendages, but these differences do 

 not exceed the limits of sub-specific 

 variation in my opinion. 



The characters of this series may be given briefly as follows : — 

 cr". (spirit specimens) from Barkuda, 1479/H 2. 

 Wings. — Membranule with white, basal spot. Wing mem- 

 brane slightly smoked, with an orange-brown tinge extending from 

 the ape.x of the triangle to a little beyond the nodus. 



Head. — Frons without T-mark, bases of mandibles and genae 

 yellow : upper lip yellow, very narrowly and diffusely edged with 



-tr 



TExr-FiG. 2. — Anax giitta- 

 fiis (J Series \. 



Abdominal colour pattern 

 (digrammatic). 



a. Prejugal. b. Post-jugal. 



