REPORT OF THE STATE ENTOMOLOGIST 349 



hairs thinly scattered over the body; the head and legs are pale orange 

 colored ; the oval spiracles, or breathing holes, on the sides, are large 

 and white, encircled witli green; on eacli of the rings, except the first, 

 there are six thorny knobs on hard and pointed warts of a yellow color, 

 covered with short black prickles; the two uppermost of these warts on 

 the top of the second and third rings are a quarter of an inch or more 

 in length, curved backward like horns, and are of a deeper yellow 

 color than the rest; the three triangular pieces on the posterior extremity 

 of the body are brown, with yellow margins, and are covered with raised 

 orange colored dots. 



The larval spines. The spines or tubercles in this species show 

 remarkable variation and modification in the successive larval stages. 

 The dorsal spines on the second and third thoracic segments in the 

 newly hatched larvae are from nearly one third to about half as long as 

 the body, very slender and deeply forked (plate 2, fig. i, t, d) In the 

 second stage, the dorsal spines on the posterior two thoracic segments 

 and the eighth abdominal segment are stouter and not quite so deeply 

 forked (plate 2, fig. 2, I), c). In the third stiige, the dorsal spines on 

 these segments are a little stouter but otherwise nearly the same as in the 

 precedmg stage; compare b and d and c and e of fig. 2. The varied 

 form of some of the other spines are represented on plate 2, fig. i, 2 ; 

 see their explanation. 



Description of the pupa. The dark mahogany brown pupa of this 

 insect varies in length from one and one-half to nearly two inches. It 

 is subcylindric in form, broadly rounded at the head, less so at its pos- 

 terior extremity with its elongated bifurcate cremaster. The short wing- 

 cases extend only to the fifth abdominal segment. The seven oval 

 spiracles on each side are conspicuous. Regions of the head and cre- 

 master, and tlie oval subdorsal areas on the first abdominal segment are 

 tuberculate; the margins of the abdominal segments are usually minutely 

 toothed. The larva pupates in an earthen cell, spinning no cocoon. 

 The teeth on the segments and the long forked cremaster enable the 

 pupa to work its way to the surface just before the moth is disclosed. 



Description of the moth. This beautiful insect, with a wing-spread 

 of from three and one-half inches in the male to nearly five or more in 

 the female, ranks among the largest and most attractive of our native 

 species. The purple brown markings on a yellow background are vari- 

 able in depth of color and in extent. The following areas are purple 

 brown in the female: patagia and the dorsum of the thorax lying 

 between them ; the dorsum of the anterior five abdominal segments 

 except a median anterior spot on each; the basal fourth, the double dis- 



