464 Records of the Indian Museum. [Vol. XVI, 



slightly. Caudal appendages triquetral, very long, the middle one 

 considerably shorter than the lateral and lying in a vertical plane. 



Legs long and slim, spidery, no armature. 



Mask typically Calopterygine ; middle lobe very deeply cleft, 

 the terminal halves minutely crenate on the outer borders, where 

 they engage with the outer lobes, the ends with a small spine at 

 the tip and the extreme edge curling over, the edge of the curled 

 part furnished with minute teeth, 2 setae on the inner surface ; 

 lateral lobes with a long moveable hook, 2 setae situated just 

 below it and 3 long robust spines of which the middle is the 

 smallest, inner border minutely crenate where it engages the 

 border of the middle lobe. Mask extends back as far as the hind 

 coxae (pi. xxxvii, fig. l). 



Hab. — Generally concealed amongst debris, dead twigs, etc., 

 or lying under cover of rocks. Movements sluggish. The insect 

 is apt to be mistaken for a Ranatra to which it bears a close resem- 

 blance. 



Subfamily LEST IN AE. 



10. Lestes sp. 



(PI. xxxv, fig. 2 ; pi. xxxvii, fig. 2, 2a.) 



Jor Pokhri, Darjiling Dist., E. Himalayas, 6.8. 18, S. Kemp, 

 1316/H2, 3 larvae. 



Mask typically Lestine, very much elongated, very narrow, 

 mid lobe projecting very slightly, 6 setae on either side of the mid- 

 dle line of the inner surface, lateral lobes foliate and branched, a 

 moveable hook supponed on one of the branches, from which 

 spring 3 setae (pi. xxxvii, figs, 2 and 2a). 



Head relatively large, eyes globular, antennae filiform, wing- 

 case long and narrow, flattened, abdomen elongated, cylindrical, 

 each segment bearing a lateral spine. 



Caudal appendages 9 mm. long, spatulate, oar-shaped, of even 

 width, flattened, crossed by broad bands of pigment. Tracheal 

 vessels branching at right angles to the main vessel. 



Legs long, armature 4 rows of fine spines on the femora. 



Hab. — Running streams. Found on water-weeds or clinging 

 to roots. 



Subfamily PLATYCNEMINAE. 



II. Copera marginipcs, Ramb. 



(PI. xxxv, fig. 3 ; pi. xxxvii, fig. 6.) 



Poona, 6. 4. 18, F. C. Fraser, 1519/H2. 



Length 14 mm. Length of caudal appendages 5*5 mm. 

 Length of abdomen 7 mm. 



Mask pyriform, tapering sharply to the mentum, sides spined 

 to the number of 11 or 12 ; mid lobe projecting sharply, armed 

 with 4 setae, whose bases are in line at right angles to the middle 

 line of the mask, the biting edge minutely dentate ; lateral lobes 

 finely spined on the outer border, minutely dentate on the inner. 



