1922.] 



b. 



F. Laid law : Indian Dragon flies , 



385 



Fig. 6. — Colour-pattern of syntho- 

 rax of Perissogomphus steveti- 

 si, sp. nov., <? . 



In addition, the second lateral suture is marked with a narrow 

 black band. 



Legs black, the first pair of femora yellowish on their ventral 

 surfaces. 



Abdomen black, marked with yel- 

 low. The first segment is yellow 

 laterally, and has a dorsal band of 

 the same colour, much contracted 

 at its middle. The second is like- 

 wise yellow on the sides, with yel- 

 low oreillet, and it has a trilobed 

 dorsal band of yellow extending the 

 whole length of the segment. Seg- 

 ments 3-7 have a narrow longi- 

 tudinal band of yellow dorsally, 

 commencing at the base of each seg- 

 ment, but not reaching to the apex except in the case of the third 

 segment. In each case this band is broadest at the base of 

 the segment and narrows rapidly apically to a very fine line. It 

 is broadest on 7. In addition 3 has a small basal lateral mark. 

 The dorsum of segments 8 and 9 is entirely black, but these seg- 

 ments and also 7 have each a complete lateral yellow band. 

 Segment 10 is yellow with black margins. The abdomen is slen- 

 der, the distal part of 7, and the whole of 8 and 9 rather in- 

 flated. 



The anal appendages are pale yellow, and in general like 

 those of Gomphus, s. str. The upper pair are simple, almost 

 regularly conical, somewhat acuminate, a little flattened below, 

 and very slightly upturned at the apices. They are a little longer 

 than segment 10 of the abdomen. 



The lower appendage is about two-thirds of the length of the 



upper pair. Its terminal 

 half is deeply cleft so as to 

 form two'branches, which 

 are a little divaricate and 

 upturned at their apices. 

 Female. The female 

 differs from the male in 

 colouring chiefly as fol- 

 lows : — On the head the 

 upper lip is dark brown 

 margined with black. The 

 ante- and post-clypeus are dark-brown, the vertex and occiput are 

 also very dark brown. Further, the hinder margin of the latter 

 carries at either extremity a small spine. 



The prothorax has the posterior margin entirely yellow. On 

 the synthorax the only noticeable difference lies in the fact that 

 the black line situate on either side of the mid-dorsal carina is 

 truncate below, and not rounded as in the male. 



The abdominal markings are very much like those of the 



Fig. 7. — Anal appendages of Perissogomphus 

 stevensi, sp. nov., 3 . 



