1922.] F. F. Laidlaw : Indian Dragonflies. 413 



Synthorax black, mesothoracic collar yellow, interrupted by the 

 black of the mid-dorsal carina in the middle line. Dorsal stripe 

 isolated, broad, elongate oval ; an tehumeral stripe represented by a 

 small superior spot. Sides of synthorax black with a broad yellow 

 band on the mesepimerite and a second on the metepimerite. 

 These yellow bands are continuous on to the meso- and the meta- 

 nntum. 



Legs black, coxae and anterior surfaces of the femora marked 

 with yellow. 



Abdomen black. The first segment has a transverse yellow 

 mark at its base dorsally. The second has a longitudinal dorsal 

 band of yellow which 

 is trilobed. Both these 

 segments are marked 

 with yellow laterally, 



including the oreillets. 

 The third and fourth 

 segments have a basal 



ring Of yellow, and p IG . 2 i.— Anal appendages of Heterofromphu< 



dorsally, from this a ceylonicus, sp. nov,, S from type in the 



longitudinal basal ex- British Museum : side view. 



tending for about half 



the length of the segment. Segments 5 and 6 have a narrow basal 

 ring only ; the basal half of 7 is brownish-yellow, and segments 8 

 and q have dark brown lateral basal marks. The tenth segment is 

 entirely black. 



Anal appendages gray-black, upper pair slightly down-curved. 

 Lower appendage with branches about five-sixths the length of upper 

 pair each branch carrying a small internal tooth at about the 

 commencement of its distal quarter. 



Antenodals of fore- wing 17, 18, post-nodals 12-14. 



Length of hinder- wing 41 mm., of abdomen 42-}- 5*5 mm. 



A handsome species rather resembling an Ictinus in its propor- 

 tions. I fancy that the late Mr. Kirby must have overlooked the 

 specimen for this reason when describing Col. Yerbury's collection. 



H. ceylonicus is very distinct from other species of the genus 

 in the markings of the synthorax, which are bolder and more 

 sharply contrasted than is usual in the genus. It resembles in 

 size the Malayan species of the genus. These are H. sumalranus 

 Martin, from Sumatra and Borneo, and H. icterops Martin, from Java 

 and Borneo. The British Museum has a specimen of both these 

 species. 



H. smithi Selys, is also represented in the Museum collection, 

 it is very similar structurally to these species though considerably 

 larger, and differs of course in details of colouring. It is found in 

 the Himalayas. H. cochinchinensis Selys, is apparently an allied 

 species from Cochin-China. H. sommeri Selys, from China is still 

 larger and differs from the other species of the genus in having the 

 upper anal appendages of the male a little incurved to one another 

 apically. H. unicolor Martin, from Siam is allied to or identical 



