426 



Records of the Indian Museum. [Voi,. XXIV, 1922.] 



Abdomen greatly depressed, segments 7 to to with stout 

 apical lateral spines, 4 to 8 with well marked dorsal ridge, raised 

 up as robust spines on each segment. 



Mask very short, extending to base of first pair of legs only, 

 middle lobe rounded and fringed with rather long stiff brissae. 

 Mentum angulated, the whole lobe nearly quadrate. 



Easily distinguished from the larvae of any other species of 

 Gomphine by the shape of its antennae. Four specimens were 



a. Larva of Onychogomphns biforceps nilgiriensis. b. Antennae of same. 

 c. Mask of same. 



d. Larva of Onychogomphus"lineatus. e. Antennae of same. 



found in the pool of a mountain stream, amongst debris consisting 

 mainly of rotting leaves, twigs, etc., above Gudalur, 26 , ii , 22. 



Five adults insects were taken within 10 yards of this pool 

 and 3 others seen. No other species have been seen or taken over 

 this stream and no other kinds of larvae found, so that there is 

 no doubt as to the species to which they belong. If the breeding 

 out of these larvae prove the correctness of the diagnosis, I 

 propose to remove the group biforceps from Onychogomphus and 

 erect a new genus for it with the name of Lamelligomphus. The 

 head of the larva reminds one irresistibly of that of a cockchafer 

 (Melolonthidae). 



