1911] Study of Caterpillars of Sphingidae 279 



EXPLANATION OF THE FIGURES. 



PLATE XVII. 



Fig. 1. Front view of head of Sphinx ligustri. It is fairly typical of the spe- 

 cies in which the head tapers moderately, but more rounded out on the sides than 

 the average. The front is also wider and less lobed at the bottom. 



Fig. 2. Labrum of Hemaris thysbe. Compare Annals E. S. A. Ill; PI. xiv. 

 Fig. 50. 



Fig. 3. Proserpinus proserpina. Typical of the Semanophorae; compare also 

 Figs. 6 and 14. 



Fig. 4. Front view of head of last stage of Ellcma harrisii. The triangular 

 head, which is more typical of the Smerinthinae. 



Fig. 5. Labrum of the same. Hyloicus is similar. 



Fig. 6. Labrum of Hippolion celerio. 



Fig. 7. Labrum of Pachysphinx modes la. P. occidentalis is the same, and the 

 normal Smerinthina; differ only in having one less marginal seta. 



Fig. 8. Labrum of Sphinx (Lintneria) eremitus. typical of the lower 

 species of Sphinx. For one of the higher type see Annals E. S. A. Ill, PI. xiii, 

 Fig. 40, which is 5. gordius, labelled "Dolba hylaeus" in error. The species 

 labelled gordius is certainly 5. drupiferarum. 



Fig. 9. Deilephila lineata. The other species are about the same. 



PLATE XVIII. 



Fig. 10. Front view of head of Hyloicus pinastri. Sphinx drupiferarum is 

 similar in outline, and so are all the species Ascribed as having a broadly rounded 

 head. 



Fig. 11. Labrum of Daremma catalpae, showing seta iii high, as in the Semano- 

 phorae. 



Fig. 12. Next to last stage of Cressonia juglandis. In the same stage Lapara 

 has the same peculiar shape. 



Fig. 13. Labrum of Cressonia juglandis, List stage. 



Fig. 14. Labrum of Amphion nessus. Typica'k 



Fig. 15. Head of Hippolion celerio, showing the slightly squarish form which 

 is most frequent in the Semanophorae. 



Fig. 16. Head of Hemaris croatica. It is broader than our species of Hemaris, 

 and resembles Macroglossa except in the small front. 



