1922.] F. F. Laidlaw : Indian Dragon/lies. 373 



This series includes a small number of rather large insects ; it 

 is represented in S. America by a single species of a peculiar genus ; 

 otherwise it is peculiar to the old world, mainly to the Oriental and 

 Ethiopean regions. 



Genus Ictinus Selys. 



Genotype: Ictinus rapax (Ramb.). 



Species examined : I. rapax (Ramb.), /. angulosus Selys. 



Characters of the series. Leaf-like expansion on either side of 

 the tergite of the eighth segment of the abdomen. Upper anal 

 appendages of male longer than the tenth segment, parallel to one 

 another and straight or nearly so. Lower appendage much reduced, 

 with a pair of small processes. 



A genus of large and handsome insects ranging from Africa 

 to the warmer parts of Australia, but most abundantly represented 

 in tropical Asia. 



Ictinus rapax (Ramb.). 



Ictinus rapax, Selys, Mon. Gomph. 

 ,, praecox, Selys, Mon. Gompli. 

 ,, mordax, Selys. Mon. Gomph. 



2(5 cT, 1 2. Calcutta, Labelled in de Selys' handwriting "Ictinus 

 rapax, Ramb. Calcutta." (154/6, 387/6, 5441/20). 



4c? S. Calcutta, April, Sept. and Oct. (6235/20, 6331/20, 6333/20). 



59 9. Calcutta (7220/8, 6283/14, 9282/14, 6332/20, 6334/20). 



1 9. Calcutta, 17-ix-io (1488/H 2). 



I 9- Calcutta, Maidan, 27-vii- 14 (8289/20). 



16". Museum, Calcutta, i8-viii-i6 (4246/H 1). 



I 9- Calcutta, "sticking to railing in Museum Buildings," 28-ix-i7 

 (7940/H. 1). 



10, 1 9. Murshidabad (1815/10, 1817/10). 



1 e? and exuviae. "Larva from hill-stream, Chakradharpur, Chota 

 Nagpur, v-18. Adult emerged in Museum, 8-vi- 18." F. H. 

 Gravely (1428/H 2). 



26 <?. Chota Nagpur, 1000 ft., i-ix-i5. E. d'Abreu. 



1 9- Barkuda I., Chilka Lake, i— 3-viii-i4. 



id 1 . Chalakudi, Cochin State, i4-30-ix-i4, F. H. Gravely (8236/20). 



i9. Trichur, Cochin State, 0-800 ft., 4-X-14. F. H. Gravely (8226/20). 



1 6 and exuviae. " Larva from hill-stream, Chakradharpur, Chota Nag- 

 pur, v-18. Adult emerged in Museum, Calcutta, 8-vi-i8." 

 F. H. Gravely (1428/H 2). 



Specimens from Calcutta have the juxta-humeral stripe 

 complete or interrupted. In the specimens from Cochin this 

 stripe is obsolescent, as is the yellow mark on the metepisternite ; 

 they are also slightly smaller than the more northern specimens. 

 Possibly the S. Indian form may form a recognizable race. There 

 seems a certain amount of individual variation, and in view of 

 this I am strongly inclined to regard praecox Selys, and mordax 

 Selys, as synonymous with the present species. 



Length of abdomen. I Length of hinder-wing. 



cf , Calcutta. 

 9 , Calcutta. 

 c?, Cochin. 

 9 , Cochin. 



48 + 3-25 mm. 



50 mm. 



45 + 3 mm. 



43 m rn- 



4C5 mm. 

 41 mm. 

 36 mm. 

 35 mm. 



