1922.] F. C. Fraser : Indian Dragonflies. 417 



on 6 the line is represented merely by a basal and a subbasal spot. 



Legs black, hind femora with a row of long, robust, evenly 

 spaced spines (The sexual differences here are very striking.) 

 Vulvar scale as for H. nietneri, but the apex scarcely notched. 



The insects are jungle-loving creatures, haunting the rocky 

 beds of wild, mountain streams. 



Microgomphus sp. 



A single, somewhat teneral female from Rangoon, coll. 1909. 

 I am satisfied that this specimen is a true Microgomphus 

 although it differs from the generic characters given above by Mr. 

 Laidlaw in the two following particulars : — 



(i) The proximal angle of triangle in the forewing is not as 

 far distant from the arc as the length of the proximal 

 side of subtrigone. 



(ii) There are two rows of cells between Cu^ and the hind 



margin of forewing. 



I have however examined a number of both sexes of M. 

 torquatus and find that neither of these two features are constant. 

 As regards the number of rows of cells posterior to Cujj I find that 



there are invariably two rows in the female and one in the male. 

 The distance of the proximal angle of the triangle in the forewing 

 is very variable in both sexes, being sometimes more and sometimes 

 less than the length of the proximal side of the subtrigone, so that 

 other generic characters being present one may rightly assume 

 that the specimen is a true Microgomphus. 



Female. Abdomen 25 mm. Hindwing 22*5 mm. 



Head black marked with citron yellow as follows : bases of 

 mandibles, small basal spots joined by a basal streak on labrum, 

 small lateral spots and a very fine streak on upper epistome, a 

 line on the front of frons interrupted in the middle ; occiput black 

 with paired minute spines on either side of its middle. 



Prothorax entirely black. 



Thorax black on the dorsum marked by a narrowly interrupt- 

 ed, citron yellow, mesothoracic collar and an oblique dorsal stripe 

 not joined to the collar ; humeral stripe absent. Laterally bright 

 citron yellow, the sutures finely outlined in black. 



Legs black, the anterior femora yellow outwardly, the hind 

 femora with about 9 robust spines on either side of the limb. 



Wings hyaline, saffronated rather deeply at the base, venation 

 as for genus subject to the exceptions already discussed ; stigma 



pale brown, feebly braced ; nodal index 



9-8 



9 

 Abdomen black, marked with yellow as follows : segment 1 



all yellow, 2 broadly on the sides, the dorsal carina finely, 3 with 



a basal dorsal spot and an elongate spot on the middle of dorsal 



carina, 4 similar but the spots much smaller, 5 to 7 with only the 



basal spots which are largest on 7 ; 8 to 10 all black. 



