Packard.] i.\j4: [March 17, 



the inner, but otherwise like the latter ; the trunks are spiny, the spinules 

 minute, sharp, nearly equal in size, there being about fifteen to each trunk 

 or stem of the spine. Tiie singular bulbous termination is flattened, 

 rather deeply divided, but somewhat like a chestnut in shape, but wider 

 in proportion, and each side is produced, ending in a blunt spinule, with 

 a stout tliick base ; the trunk is umber brown, but the bulbous extremity 

 is blackish brown. 



On being touched the larva jerks its head and front body sideways vig- 

 orously. 



Each of abdominal segments 1-7 has a pair of smaller sharp spines 

 about one-third as long as the longest thoracic spines, which are bent just 

 beyond the middle where it sends off a spur ; the end bearing a stout, 

 not very long bristle. Besides these there is a pair of subdorsal spines 

 and a lateral smaller one situated above the insertion of the legs, or six 

 spines to a segment. There is a single median spine on the eighth seg- 

 ment just like the shorter outer ones on the thoracic segments in shape 

 and color, and ending like them in a forked bulbous expansion. Also on 

 the ninth segment is a smaller, shorter, single median dorsal spine, but 

 regularly forked at the end, not swollen. On the tenth segment near the 

 base are two stout, short spines, ending in four branches. Behind them 

 at the end of the suranal plate are four minute spinulose piliferous spines, 

 which are black, all the others in front being brown. The large, broad, 

 squarish anal legs are corrugated on the side. All the legs, thoracic and 

 abdominal, are black. The specimens died before molting. 



Fig. 5. — Armature of atheroma regalis. Stage I. a, the first abdom- 

 inal segment, showing the relative position of the spines ; sp, spiracle ; 

 b, one of the dorsal prothoracic "horns ;" c, one of the dorsal horns of 

 the third thoracic segment ; d, one of the dorsal abdominal spines, those on 

 segments 1-6 not differing in size or structure, near the base are two 

 minute blunt setae ; e-h, the armature of the last three abdominal seg- 

 ments ; e, the caudal horn ; e', the subdorsal spine of the same (eighili) 

 segment; /, one of the dorsal spines of the ninth segment, wliich 

 is evenly forked at the end ; g, one of the large lateral spines aris- 

 ing from the suranal plate (x); h, the end of the suranal plate. All the 

 figures drawn with the camera to the same scale. 



The following description is drawn up from specimens bred at Provi- 

 dence, and described October 10. They fed on hickory, and were sent to 

 Mr. Bridgham from Georgia. 



Stage 11 0). — (Probably Stage IT, as the increase in size between the 

 later stages is very marked.) Length, 25 mm. The head (width, 

 2.8 mm.) is rather large, rounded, as wide as the body, smootli and shin- 

 ing, mahogany brown, with two faint black shades converging towards 

 the apex. The body is somewhat slender, the skin smooth and dull flesh- 

 brown, with smoky blackisli marks, the spines and spinules a little paler 

 than the body and lipped with black. The prothoracic segment is broad, 

 the front edge raised and flaring, with a transverse row of six black spines. 



