1922.] F. C. Fraser : Indian Dragon/lies 425 



Wings similar but only a single row of cells between M t - and 



M fa ; nodal index 



9-11 

 at level of node. 



— and 3 rows of cells in discoidal field 



ii-ii 



Onychogomphus biforceps nilgiriensis, subsp. nov. 



3 5 and 1 9 Gudalur, Nilgiris, l6'X'2I, coll. F. C Fraser. (One male, 

 the type, coll. by T. Bainbrigge Fletcher on the same date.) 



Male. Abdomen 354 mm. Hindwing 30 mm. 

 Differs from 0. biforceps Selys as follows : — 



Yellow spot on occiput absent ; mesothoracic collar interrupted ; 

 humeral stripes entirely absent ; a small yellow spot just below wings 

 on the upper part of the broad lateral black stripe ; oval dorsal spots 

 on abdominal segments 4 to 6 absent ; a minute apical spot in ad- 

 dition to small lateral basal spot on segment 8 ; superior appendages 

 yellow only on outer side, black inwardly ; legs entirely black. 



The female of 0. biforceps Selys has not been described, but 

 is probably somewhat like that of the present species which is as 

 follows : — 



Abdomen 36 mm. Hindwing 33 mm. 



Colouring similar to the male with the following exceptions : 

 spots on labrum very small ; band on frons interrupted by the 

 black in the floor of the suture so as to form two oval spots ; occi- 

 put with two robust spines situated close together at its middle ; 

 antehumeral band not connected with the mesothoracic collar ; 

 yellow spots on sides of segment 2 and the oreillets confluent ; 

 basal spots on dorsum of 3 to 7 interrupted by the black of dorsal 

 crest ; basal spot on 8 very minute and the apical one absent. 



Anal appendages rather longer than segment 10, tapering, 

 black with a bright yellow tip, a long triangular protuberance 

 between them ; 7 to 10 progressively shortening. 



Vulvar scale half the length of segment 9, bifid to its base so 

 as to form two small triangular leaves. 



Wings enfumed and distinctly saffronated at the base ; nodal 



12-14I15-11 



index: 



11-10I10-13 



Jungle-loving insects, hiding up in shady mountain streams. 



Description of larva of 0. biforceps nilgiriensis. 



Total length 23 mm. Length of hind femora 6 mm. Greatest 

 breadth of body at abdomen 9 mm. 



Head moderately broad and quadrate, a postocular spine on 

 either side ; antennae remarkably specialized , basal segments small, 

 cylindrical, 3rd segment broad, flattened and triangular, sloping 

 downward and forward, 4th segment present only as a rudimentary 

 tiny spine at inner lateral angle of 3rd segment. 



Prothorax small, a double tubercle on its dorsum. 



Wing sheaths broad, extending to middle of segment 6 or 

 thereabouts. 



