50 ZYG^NID^ AND BOMBYCIDiE 



EOMBYCIDi;. 

 LITHOSIINJE. 

 Genus CLEMENSIA* Packard. 



"Head large, front broad, clypeus triangular, very broad between 

 the antennae. Antennae very slender, simple, with fine set^e be- 

 neath ; $ still more filiform and without setas. Palpi three-jointed, 

 free from the head, porrect, the whole of the third joint reaching be- 

 yond the front of the head, and only one-fourth shorter than the second 

 joint, acutely pointed. Maxilte long and slender, reaching to the 

 second pair of coxse when extended. 



" Thorax just as long as broad, of equal width with the abdomen. 

 The pro-thorax is badly separated from the meso-thorax. Patagia 

 slight, not reaching beyond the base of the meso-scutellum. 



Primaries a little more than twice as long as broad. Costa continu- 

 ously convex from base to sub-acute apex ; outer edge very oblique, a 

 little more than half as long as the inner edge, which is especially 

 convex at the basal half Costal region very broad, first to fourth sub- 

 costal nervules very short, equal in length, and going rapidly to the 

 costal edge; the fifth subdivides within its middle and the triangular 

 interspace between the two branches is twice as long as broad. Sixth 

 subcostal and first median nervules are parallel and of the same length. 

 The three first madian nervules arise very near together, while the 

 fourth is remote as usual, and arises just within the middle of the 

 length of the wing. 



" Secondaries broad triangular; reaching to the base of the anal tuft, 

 apex a little produced ; costa convex throughout, from base to apex, 

 internal angle well rounded. Subcostal subdivides midway between 

 the apex and discal nervules, enclosing a triangular space. The three 

 upper median nervules are very approximate, their interspaces narrow, 

 linear. Legs long, slender, with four sub-equal, very long acute tibial 

 spurs which are a little shorter in the ? . Abdomen stout, broad as 

 the thorax and four times as long. In 5 a broad obtuse anal tuft, 



* Named after the late Dr. Brackenridge Clemens. 



