146 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



f rcim those of C. regalls in the upper claspers being a little nai rower and longer, while the lower 

 pair (harpes) are very different, being much smaller and thinner, rather l)roader, stouter, and 

 flatter below, less far apart and the tips less upcurved. The suranul plate is nuich wider at 

 base. I have not j-et seen the female in any collection, as it is very rare. 



Expanse of the fore wings, $ 75 mm.; length of one fore wing, I .35 mm.; breadth of one 

 fore wing, S 15 mm. ; length of a hind wing S 22 mm. ; breadth of a hind wing. I 15 mm. 



The uniformly dark lilac-gray hue of this species is noteworthy. Structurally it differs from 

 6'. regaJix in having fewer pectinations and in the palpi being apparently stouter, and in the 

 shape of the fore tibial epiphysis, as well as in the very different shape of the S genital armature. 



This species, whether we consider the larva or imago, is the most highh- modified of any of 

 the genus, forming the type of a distinct section of the genus. In this connection it is note- 

 worthy that the species is, so far as yet known, confined te the Atlantic coast of North America 

 (Map IX), and this suggests that it is the most recentlj^ evolved species of the genus, whose 

 center of origin was evidently the eastern forest region of South America. 



E</(j. — Slightly flattened spherical-oval; the surface very finely pitted. Length 2.3 mm.; 

 diameter 1.9 mm. 



Received from Mr. William Dearden, Lonsdale. R. I., June '20; the larv;e hat'?hed July 1-2. 



Larm — Stage I. — Length 6.5 mm. Body rather slender. Head smooth, shining jet-blaclv. 

 Prothoracic segment large, receiving the head, which is partly concealed or hooded by it. Three 

 pairs of large, dull })lack, rather long dorsal spines, each spine ending in a large flattened bull), 

 which (Mids in a long sliMider process; those of the prothoi'ax a little shorter than the two hinder 

 pairs, and extended out horizontally over the head. Second and third thoiacic and abdominal 

 segments 1-4 deep honey -yellow, the rest of the abdomen black, but irregularly spotted or mot- 

 tled with wax-yellow on the sides. 



Abdominal segments 1 to 7 with small irregular ciorsal sj)ines each bearing four tines, the 

 upper bent horizontally; those on the seventh and eighth segments larger and more erect. The 

 median one on the eighth and ninth abdominal segments nuich larger and higher, but with no 

 bulbous enlargements. 



On abdominal segments 1 to -t in front of each dorsal and lateral spine is an irregular angular 

 black spot, the lateral one nuich the larger and squarish. The suranal plate flat. The plates on 

 the anal legs are spiny, with long stiff' setie. Thoracic and abdominal legs lilack, all large and 

 long. 



July 12. Length now l* nmi., about read}' to molt. The prothoracic segment is yellow, like 

 the two behind, except the large oblong black dorsal plate giving rise to the two horns. The 

 body is black on abdominal segments 5 to the end, though paler than before. 



Stage II. — Just molted, July 13, 9 a. m. Length 10 mm. Head jet-black. The body is now 

 dull wax-yellow, with dusk}^ hues. A wax-yellow longitudinal band on the middle of the 

 prothorax. and the anterior edge of the second and third thoracic segments are dusky. An 

 interrupted dusky or umber-brown broad subdorsal band. Abdominal legs concolorous with the 

 band. The larger spines are a little larger, the bulbs a little smaller in proportion. All the 

 spines are black throughout, and the metathoracic horns are a little longer than the body is thick. 

 Prothoracic horns atiout two-thirds as long as the four behind. 



On the outside of the abdominal legs above the planta is a rough jet-black plate. The 

 middle of the anal legs uml)er-brown. A sul)dorsal and a lateral row of black spots. 



It somewhat reminds one, as regards the color, of a late wax-yellow stage of E. imperialix. 



Stage III. — Molted for the second time (in New York) July 23. Length 15 mm. Head dull 

 pitchy reddish yellow. The three pairs of large dorsal spines now longer than before; one- 

 (juarter longer than the body is thick, but still retaining the l>nlbous horned expansions at the 

 end; they are much larger in proportion than the dorsal abdominal ones. The colors are faded 

 and too indistinct to describe. 



I once found a nearl}- full-grown caterpillar of this rare moth on the pitch-pine at Bruns- 

 wick, Me., August 5, which lived in confinement until the 17th of the mouth. The following 

 3'ear a younger one occurred on the white pine during the second week in August. 



