INDIAN DEAGONFLIES. 



493 



Abdomen very robust : segments 2 and 3 moderately, dorso-vcntrally dilated 

 tapermg thence to the anal end, triquetral in cross section : dorsum dark 

 reddish yellow, segment 1 with a transverse yellow stripe, segments 2 and 3 a 

 lighter ohve green tmt, their bases finely darkened, the greater part of the 

 dorsum of the 9th segment and the whole of the 10th black. 



Superior anal appendages small and black, the inferior shorter, only a little 

 shorter than the superior. 



Genitaha deep black, closely resembUng those of dels, hamules very lar»e, 

 cupped on the ventral surface. Lobe not quite half as high, narrow and pointed.' 



Wings hyahne, shghtly tinted, the apices diffusely brown : in the forewing 

 a brown ray in the costal space not extending quite as far as the first antenodal 

 nervure, a similar ray in the hindwing and a narrow ray in the cubital space : 

 stigma black, about 5 mm. in length : 15 to 16 antenodals in the foremng : an 

 accessory, cubital nervure in the hind : trigones in both wings traversecT, the 

 hypertiigone of the forewing only traversed : occasional supplementary nervures 

 to the bridge. 



2 Head : labium black with two small yellow spots at its base: face and forehead 

 pale oUvaceous, grejish shades at the anteclypeus and middle of postctypeus : 

 basal mark of forehead nearly black, broader at the sides than in the male. 



Thorax as for male except that the dark area on the dorsum is more marked 

 and the antehumeral spots are smaller. 



Abdomen very robust, nearly parallel-sided to the anal end, a reddish yellow 

 in colour, the lateral border of segment 3 narrowly black ; a moderately broad, 

 dark line on the dorsal carina from the 3rd to the 8th segment ; 9th segment 

 black except for a narrow, lateral margin ; 10th bright brown, very small. 



Anal appendages black. 



Wings broader than in the male and reticulation closer, suffused with a dirty 

 yellow, the apices being diffusely brown as far as stigma ; the basal marking 

 broader than in the male ; the ray in the foremng extends half-way to the 1st 

 antenodal and in the hind as far as that structure ; antenodal nervures in forewing 

 16 to 17 ; all trigones traversed, the hj^pertrigone only so in the forewing, supple- 

 mentary nervures to the bridge and in the hindwing, in the cubital space also. 



Hob. — Burma. 



79. Lyriothemis mortoni, Ris, Cat, Coll. Setys, p. 1065 (1916), 



Lyriothemis acigastra, Selys, Odon. des Birmanie (1891). 

 Calothemis acigastra, Selys, Ann. de Dresden (1878). 



Fig. 69. Wings of Lyriothemis mortoni. 

 This species is described from a single male from Lower Burma. It diffcis 

 from acigastra considerably, by the thoracic pattern being different, the yellow 

 antehumeral spots are not convergent, the humeral stripe is absent so that the 

 characteristic, curved marking of acigastra is not present. 



