301 



I 

 margins about in the proportion of twenty-seven, nineteen and six- 

 teen to each other, the apex of the apical and anal angles but slightly 

 rounded off. Hind wings nearly as large and as wide as the front 

 wings, and nearly in the form of half a quadrant, the costal and inte- 

 rior margins straight, and equal to each other, the terminal margin 

 strongly curved in its middle, so as to foreshadow a tail, and more 

 gently elsewhere ; the apex of the apical angle much rounded off, 

 that of the anal angle scarcely rounded off. Fringes unicolored. 

 Larva ten-footed, its dorsum with curved lateral appendages covered 

 with short, velvety hair, and similar to those of Limacodes ? hyalinus 

 Walsh, except that they are much shorter and none of them abruptly 

 longer than the others. 



HippARCHiscus -VENUSTUS, n. sp. cf ? Milk-wliite. Head with 

 a large, squarish, ferruginous spot extending from eye to eye before the 

 base of the antennte ; occiput grass-green ; antennae of c?, with a pair 

 of the longest bipectinations, which lie about one-fourth of the way 

 from the base, expanding two-thirds the diameter of the eye. Thorax 

 grass-green above. Abdomen^ with the dorsum of segments 1-3 

 grass-green, segment 1 with a milk-white, squarish dorsal spot cover- 

 ing its whole length, and 3 with a similar spot, generally confluent 

 with the white surface of 4, but occasionally, when 4 and 5 are also 

 marked with green above, as distinct as the other spot. Wings grass- 

 green, white on the basal three-fourths of their costal edge, their 

 fringe white, and each wing with two narrow, linear whitish fasciae, 

 the locus of which may be thus defined : — Let the interior margin of 

 the front Wing and the costal margin of the hind wing touch as near 

 as may be ; then trisect the interior margin of the front wing, and, 

 with one leg of the compasses on the extreme base of either wing and 

 the other leg on the point of trisection nearest to the base, describe a 

 circular arc on either wing. From the other point of trisection draw 

 upon either wing a line parallel with the terminal margin ; and let 

 each one of these four lines be slightly sinuate, and let that next the 

 base of the front wing be almost serrate. Length S .40 inch, ? .35-39 

 inch. Expanse, <S 1.06 inch, ? 1.00-1.18 inch. One cf, two ?,one of 

 which was bred May 11th from the lariia, which hybernated, without 

 spinning any cocoon, at the bottom of a glass jar. Food-plant, oak. 

 The grass-green color in this insect is nearly the same shade found in 

 Attacus luna, but scarcely so yellow. The larva was a true "looper," 

 of the usual cylindrical shape, and of a dingy-brown color, and in- 

 cluding the appendages measured about one-fourth of an inch across. 

 The pupa is of a pale ochrey-brown color, varied with reddish-brown, 

 with many fuscous dots, especially along the nervures of the wing- 

 cases, and with the caudal thorn simple. It measures .48 inch, includ- 

 ing the thorn ; (from the pupal integument.) 



