LITEOSIID^. 51 



Subfamily HYPSIN^. 

 All the genera in this subfamily possess a peculiar stridulatory apparatus in both 

 sexes. This is distinctly visible on the upperside of the posterior margin of the fore- 

 wing, and as viewed from the underside of the "wing appears as a short oval nacreous 

 cavity, situated between the submedian vein and the extreme margin, along the upper 

 edge of which projects a raised longitudinally oblique fold, which is smooth in some, 

 and transversely scabrous in others ; and on the ujjperside of the hindwing is a patch 

 of scabrous scales, or a short transverse outwardly curved raised scabrous bar, which, 

 by the motion of this wing, probably plays upon the raised fold over the edge of 

 the cavity, and produces a stridulating sound. 



Genus HYPSA. 

 Rypsa, Hiibner, Verz. bek. Schmett. p. 172 (1818-25); Walker, Catal. Lep. Het. B. M. ii. p. 449. 

 Forewing elongated ; costa arched towards the end, apex acute, exterior margin 

 very oblique, posterior margin somewhat convex; cell extending beyond half the 

 wing ; first subcostal emitted at nearly one-half before end of the cell, second at one- 

 fifth, bifid at one-fourth from its base, fourth from end of the cell, bifid, and anasto- 

 mosed- to third near its base, the fifth being thrown off from below before the 

 juncture ; discocellular slightly bent close to upper end, radial from the angle ; three 

 upper medians from angles at end of the cell, lower at one-third before the end ; 

 submedian much recurved : hindwing short ; exterior margin convex ; costal vein 

 extending to apex; subcostal bent upward at one-third from its base and joined 

 to costal by a short spur ; cell extending nearly one-half the wing ; two subcostal 

 branches from end of the cell ; discocellular slightly oblique and concave ; three 

 upper medians from angles at end of the cell, lower at one-third before the end. 

 Body moderately stout and short ; palpi ascending, long, slender, second joint reach- 

 ing to vertex, third joint nearly as long as second, cylindrical, slightly clavate at tip; 

 antenna very finely bipectinated ; legs squamose. (H. silvandra.) 



HYPSA PEESECTA (Plate 100, Fig. 1, ? , la, larva). 

 Hypsa persecta, Butler, Trans. Ent. Soo. 1875, p. 317. 

 Forewing greyish-brown, with a broad creamy-white longitudinal medial area, 

 and a large spot above end of the cell ; base of wing pale ochreous with black dentate 

 spots : hindwing creamy-white, with a narrow greyish-brown marginal band ; a black 

 spot at end of the cell, and a discal series of three spots. Thorax and head pale 

 ochreous, thorax black spotted ; abdomen brighter ochreous-yellow, with slight and 

 indistinct blackish dorsal rings, and lateral spots ; palpi with black bands ; legs 

 black streaked above. 



Expanse 2 to 2| inches. 



H 2 



