220 Transactions. — Zoology. 



Apices of the triangles of the fore wings directed out- 

 wards ; sectors of the arculus separated at 

 their bases. 

 Eyes contiguous . . . . . . . . ^schna. 



Eyes separated . . . . . . . . Uropetala. 



Wings attenuated near their bases. 



The subnodal and median sectors starting close to- 

 gether from the principal sector, nearer the 

 arculus than the nodus . . . . . . Lestes. 



The subnodal sector starting from the principal 

 sector at the nodus, the median sector a little 

 way behind it .. .. .. .. Xanthagrion . 



Tribe LIBELLULINA. 

 Eyes large and contiguous, without any tubercle behind. 

 The first ante-nodal uervule of the fore wings is not always 

 continuous across the lower costal space ; the hind wings 

 are rounded at the anal angle in both sexes ; the triangles 

 of the fore and hind wing differ in shape ; sectors of the 

 arculus united at the base. 



Genus Sympeteum, Newman (1855). 



Frontal tubercle slightly truncate ; posterior lobe of the 

 prothorax elevated. Pterostigma generally short or mode- 

 rate ; sectors of the arculus petiolate ; one cross-nervule in 

 the lower basal or median space. Pore wings with 7 or 8 

 (rarely 9 or 10) ante-nodal and 6 or 7 post-nodal nervules, 

 the last ante-nodal very rarely and the first two or three 

 post-nodals never continuous across the lower costal space ; 

 triangle rather broad, free, on a level with that of the hind 

 wing, three or four rows of post-triangular cells ; nodal sector 

 undulated beyond the middle. Hind wings with 5 ante-nodal 

 and 6 to 8 post-nodal nervules, the first three post-nodals not 

 continuous across the lower costal space ; triangle free. 



Distribution. — Cosmopolitan. 



Sympetrum bipunctatum. 



Libellula (Diplax) bipunctatcif Brauer, Reise der " Novara," 



Neuroptera, p. 26 (1868). 



Head with the lips reddish, the front rather golden, with a 

 narrow black line to the base of the antennae ; vertex yellowy 

 the occipital triangle reddish. Thorax reddish, the sides 

 yellowish, with black spots. Basal segment of the abdomen 

 with a black spot on each side, the second or third with a 

 black spot in the middle. Wings hyaline, the posterior pair 

 yellowish at the base ; costa yellow at the base ; pterostigma 

 margined with black. 



Male with the legs black, the coxaa reddish, femora and 

 tibiae yellow on the outside. Pterostigma reddish ; 9 or 10 

 ante-nodals. 



