March, iS96 ] DyAR AND MORTON, NeW YoRK SlUG CATERPILLARS. 9 



the anterior corners cut off, 2 mm. wide. A fold runs across joint 2 

 obliquely from the anterior corner of the cervical shield backward 

 above the spiracle. Two hairs subventrally (iv + v) on every segment 

 except joint 2. Thoracic feet small, colorless, with a terminal brown 

 claw. About eight setae on the suranal lobe and seven on each paranal 

 lobe, the latter not different from those just assigned to the subventral 

 row. Subdorsal tubercules represented by tiny spines on joints 6 to 10, 

 as in the previous stage. On the upper side of the lateral horns on 

 joints 6 to II, near the tip, are a series of patches of minute detachable 

 spines, designated '^caltropes" by Dr. Packard. (Plate I, fig. 5.) A 

 few are also found among the detachable spines at the end of the body, 

 but of a somewhat different shape. (Plate I, fig. 6.) The length of 

 the^e "caltropes" is about .07 mm. Length of the larva 16 to 23 mm. 

 Cocoon. — (Plate I, fig. 19). With the characters of the group. 



EXI'LANATION OF PlATE I. 



{Sibine stimulea. ) 



1. Larva in stage I, enlarged. 



2. End of stage III, a diagram showing the genesis of the markings of the central 



dorsal area. 



3. A horn of stage I, 175 diameters. 



4. A permanent spine (seta) of a long horn X 50- 



5. A " caltrope " from a lateral horn X I75- 



6. A " caltrope " from among the detachable spines X I75- 



7. A detachable spine X S^- 



8. Skin after the removal of the detachable spines X I7S- 



9. Diagram of front view of larva, stage VIII. 



10. Diagram of front view of larva, stage VII. 



11. A seta of the rudimentary subdorsal horn of joint 8 with the adjacent skin spines 



X50- 



12. The same region X 175> showing the skin spines enlarged. 



13. The skin spines on a horn X 'TS- 



14. A solitary spatulate seta from the end of the subdorsal horn of joint 5 X I75- 



15. Sibifte stimulea. 



16. Mature larva. 



17. Larva stage VI, natural size. 



18. The same, dorsal view. 



19. Cocoon. 



20. A group of eggs as laid on the leaf. 



21. Feeding traces of the larva at the first period of eating. 



22. The skin spines on a horn, penultimate stage X 175- 



23. 24. Base and apex X '75 of the spine shown in fig. 7. 

 Figures 15 to 21 by Miss Morton, the rest by Dr. Dyar. 



