INDIAN DRAGONFLIES. 



159 



Abdomen : Ist, 2nd cand 3rd segirents markedly dorso-ventrally dilated, 

 the 2nd bearing a strong, angidated euiinence on the doreum, a slight con- 

 striction at the 4th and then alniost parallel-sided to tie tud. Lorsiim 

 finely keeled, it and lateral borders minutely serrated. Male black ; the 

 first 3 segments frosted with white and the underneath coni^iletely white. 

 Female smiilar in shape to the male but somewhat stouter, bhick marked 

 with yeUow as follows : — the fir&t '6 segmei ts broadly at the sides, the 4th 

 to the 7th with a sub-dorsal stripe and a proxin al sub-dort-al sj ot which 

 are less marked and grow progressively smaller as traced towards the anal 

 end ; 8th and 9th segments all black; the lUth witli a lateral, quadrate siot. 



Anal appendages long, narr<»w and cyliudiical, bJacl, ralhtr It uger than 

 the 9th segment in the male, and as long as the ^th and lOth in the female. 



Genital organs of the male , lamina procumbent, stroi.gly arched and 

 over-hanging ihe tentacula- ; teiitaculie a pair of stoi.t, curling hooks 

 which first approximate in the middle line and then diverge outwards and 

 backwards, black and highly glazed. Lobe of large size, higher than the 

 tentaculaj. 



Genitals of female: borders of 8th segment not very prominent, foliate, 

 broadly notched ; vulvar scale somewhat trumpet-shaped, keeled slightly 

 and notched in the middle line. 



Wings long and narrow, reticulation close, hyaline in both sexes. The 

 costa and the second series of antenodal nervures biight yellow. Arc 

 usually between the 1st and :;i d antti.odal ntrxures ; 1ii}.oi,e in the fore- 

 wing traversed, in the hind entire and at the arc ; hypertrigones entire ; 

 antenodal nervures 10 ; 1 cubital nervure to all wings; subtrigone formed of 

 8 cells ; 2 rows of discoidal cells ; occasionally the teld Le}.ins with one 

 row of 3; I row of cells between 5 and ba, occasionally some doubled cells ; 

 8th nervure in the hindwing separated from the trigonal anal angle; 

 stigma pale yellow heavily bordered with black, o to 3*o mm.; membrane 

 moderately large, grey with a w'hite basal border ; loop well-formed ; split 

 cells at the outer angle only; apex short; basal part long and narrow, 



Hab. Mesopotamia. 



18. Orthetrum brunneum brunneumi Selys. 

 LiMlula hrunnea, Fouscolombei. 

 lAhella hrunnea, Brauer. 

 Libella cceiulescens, Fonscolomboi. 



Fig, 26.— Wings and male genital organs of O. brvntuum brunneum. 

 Expanse 68 mm. Length 48 mm. 



