in the Basin of the Amazons. 279 



The genus was instituted by Lederer, and characterised 

 by the peculiarly produced anal angle of the hind wing 

 in the <? . 



86. Microthyris prolongalis. 



Botys prolongalis, Gn., Delt. & Pyr., 353, 420, ^. 

 B. eurytalis, Wlk., Cat. Lep. Het. B. M., xviii., 

 p. 576, <? . 



One ? , from Pupunhazinho, Nov. 8th, 1874. 



Guenee's male was from Brazil. The three males in 

 the British Museum Collection, which form the types of 

 Walker's B. eurytalis, are from Jamaica and St. Domingo, 

 The descriptions both of Guenee and Walker apply, of 

 course, only to the males. In the females the hyaline 

 spots are much larger and more conspicuous, and the 

 course of the lines can be clearly traced. In both sexes 

 the palpi are unicolorous fuscous. In M. sectalis, on 

 the other hand, they are distinctly parti-coloured. 



DiASTKEPTONEURA, n. g. 

 Fore wing short, broad, triangular ; costa strongly arched at the 

 base, slightly concave before the middle and convex before the 

 apex, which is rounded ; hind margin and inner margin forming a 

 single ctu-ve, almost semicircular, with a slight indentation before 

 the anal angle. Hind wing narrower, with the centre of the hind 

 margin produced, but rounded off. Antennae long, strongly pube- 

 scent beneath ; palpi ascending, smooth, compressed ; third joint 

 short, blunt, not rising above head ; tongue present ; abdomen in 

 (? with a long tuft of hair. Scaling glossy. Legs stout, with 

 femora and tibias hairy. Neuration : Fore wing, costal thin to the 

 middle of the costa ; subcostal strongly developed ; first subcostal 

 branch at one-half of the cell, the other four on one stem rising 

 from the upper angle of the cell ; the fifth leaving the stem a little 

 above the angle, the second and third starting from the fourth 

 about the middle ; first median branch at two-thirds of the cell, 

 running sharp down into the anal angle ; second and third from 

 lower angle of cell, the second running parallel to the first ; radials 

 from the disco-cellular, the upper a little below the upper, the lower 

 a little above the lower, angle of the cell. In the lower half of the 

 cell, about half-way, the membrane of the wing beneath is 

 puckered and raised, and a strong fold runs longitudinally from it 

 through the cell, thence between the lower radial and upper median 

 branch to the hind margin, before which it is suddenly deflected 



u2 



