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spécimen t\A"o cross veins are présent in the right fore wing, and 

 the pterostigma accordingly bas a subquadrangular shape. In a 

 spécimen of the same species from the Musemn in Vienna the 

 pterostigma in three wings is subqnadrangular (2 cross veins) and 

 in the left hindwing subtriangular (i cross vein). In spécimens of 

 B . capensis there are sometimes a snbtriangular pterostigma and 

 sometimes a subquadrangular one. 



In ail the known species is a hvaline spot (Thyridium) at the 

 furcation of the média and sometimes also one at the furcation of 

 the radial sector, and likewise is found a small chitinous dot in 

 each of the two first cellules between the radial sector and média. 



TABLE OF SPECIES. 



1. ïhe ist anal vein vu^-us into the margiu lar outer than the furcation of 



the radial sector and of tne média takes place 2 



The ist anal vein runs into the margin before or at the sanie distance 

 as the furcation of the radial sector and the média takes place. . 4 



2. Pterostigma nearl}M"ectangular, 8 times longer than broad . . . . 



B. weelei raihi. 



Pterostigma subtriangular or subquadrangular, 3-4 times longer than 

 broad 3 



3. Two cross veins in the costal area, one near the base and onè near the 



apex ■ B. nebiclosus Klug. 



One cross vein in the costal area, a basai one . B pobeguiiii^AVA?,. 



4. Two cross veins, an apical and a basai eue, in the area between the 2ud 



cubital branch and the ist anal vein 5 



One cross veiu (the basai one) between the 2nd cubital branch and the 

 ;st anal vein. .'.... 9 



5. Between the eyes a broad blackish streak, enclosing the ocelli and the 



insertion of the antennae B. capensis Thunb. 



No blackish streak, ouly a blackish space between the ocelli. . . 6 

 6 One cross vein between the hind border of the pterostigma and the ist 



branch of the radial sector B. peringneyi mihi. 



Two cross veins 7 



7^ Appendices superiores of maie, seen from side, almost hastiform . 



B, sjôstedti Weele. 



