8 Journal New York Entomological Society. [Voi. iv. 



on the short ones. Width of the head 1.4 mm. (calculated 1.47). 

 Length of the larva 9.5 to 13 mm. 



Stage VII. — As in the preceding stage. Stage VII differs from 

 the last stage (VIII) as follows : The horns are longer (compare figs. 10 

 and 9 ) and their skin spines shorter (Plate i, figs. 22 and 13). The 

 purple brown color is less extensive, being absent from the subventral 

 area and the posterior end of the body, confined to the regions described 

 above, and its tint is rather paler. The patches of " caltrope" spines 

 are present, but smaller than in the last stage and there are no tufts of 

 detachable spines. The long horns grow from 3.5 mm. to 5.8 mm. 

 during the stage and are suddenly shortened to about 2 mm. at the last 

 molt. Width of the head 2 mm. \ length of the larva 13 to 18 mm. 



Stage VIII. — (Plate I, fig. 16). Head beneath joint 2, but 2 not 

 beneath 3 ; joints 3 and 4 somewhat folded. Dorsum rises nearly per- 

 pendicularly in front, rounds over at joint 5, slopes gently and slightly 

 to joint II, and is then nearly perpendicular to the anus. No subdorsal 

 ridge, the body evenly rounded, the sides almost perpendicular. On 

 joints 3, 4, 5 and 11 a pair of suborsal fleshy processes, furnished with 

 long stiff spines, salmon colored with black tip (Plate I, fig. 4) ; among 

 them a very few spatulate setae (Plate I, fig. 14). The processes on 

 joints 3 and 4 are short, those on joints 5 and 11 long (2 to 3.5 mui.), 

 on joint 12 small and still smaller on joint 13. A similar lateral row on 

 joints 3, 4, 6 to 12, all short. On joint 12, above the lateral process, 

 and on 13 anterior to it, is an elevated velvety brown spot, composed of 

 closely set, detachable spines (Plate I, figs. 7, 23 and 24; fig. 8 shows 

 the appearance of the skin after these spines are detached). These 

 spines have a pale yellowish shaft and brown-black tip. Body smooth 

 to the naked eye, under a lens finely spinulose (Plate I, figs. 11, 12 and 

 13) with paired dorsal and two lateral rows of intersegmental shallow 

 pale-colored pits. Color dark purplish vinous ; a pale yellow, elliptical 

 spot dorsally on joints 5 and 1 1 , edged with blackish ; a much larger 

 similarly colored one on each side subdorsally behind the large horn on 

 joint II ; a large bright green patch covers the back and sides of joints 

 6 to 10 like a blanket, extending on joints 11 and 12 laterally, and 

 leaving an elliptical patch of the ground color dorsally on joints 7 to 9 

 like a hole in the blanket. The blanket patch is narrowly edged with 

 black and broadly with white. Head pale greenish, eyes black, mouth 

 brown ; width 3 mm. The anterior edge of joint 2 bears many setae, 

 and there is a group of them before the spiracle. Cervical shield a 

 skinny area with a few punctures on its anterior border, square behind, 



