125 



TERTAS MEXICANA. 



PLATE VIII. Fig. 4. 

 Boisd. Spec. gen. p. 655. PI. iii. C, tig. 1. 



This insect was discovered not long since in Mexico, 

 and is considered rare. The colour of the surface 

 is very bright citron-yellow, the upper wings with a 

 broad black border externally, which ends in a 

 quadrangular expansion a little before the middle of 

 the internal margin. The under wings have the 

 outer border prolonged into an acute angle, forming 

 a kind of rudimentary tail, and the anterior half is 

 widely bordered with black. The primary wings 

 are pale citron-yellow on the under side, with a 

 central black point, and have the outer border near 

 the fringe tinged with red; the secondary pair 

 yellow, speckled with ferruginous particles, and 

 having a black point in the centre, the extreme 

 angle marked with a ferruginous spot, and the pos- 

 terior half with four or five other spots of the same 

 colour, having sometimes a tendency to form an irre- 

 gular transverse band. The above description applies 

 to the male ; the female has the surface of the wings 

 whitish-yellow, with the black border broader, and 

 the anterior margin of the secondary wings widely 

 orange yellow. The expansion varies from twenty 

 to twenty three lines. 



