-8 4 - 



outer side, and a similar series along outer side of tarsi. The hind tibiae 

 are always longest and are furnished with two pairs of very long unequal 

 spurs. The species classed as Phlegethontius are more robust, with 

 broader head, somewhat more prominent palpi and rather broader wings. 

 Sphinx is applied to the narrower winged species with long acute apices. 

 Daremma has rather more retracted head and more rounded outer mar- 

 gin. Hyloicus is very like Daremma but there is an excavation in the 

 secondaries before anal angle, Diludia has the hind angle of pri- 

 maries marked, and lacks the armature of the fore legs. This has per- 

 haps a claim to generic distinction, but the armature here is a variable 

 quantity and not decided enough in its character to be given much weight. 

 Dolba is applied to a small, dark species, with rather short stout ab- 

 domen and unarmed fore tibiae. None of these generic names seem 

 worthv of adoption, since the characters upon which they are based are 

 evanescent. 



Caiitethia is rather a peculiar form with the habitus of Pogocolon, 

 but the structure of a true Sphinx, except for the wider head and more 

 prominent eyes, which ally it to Dilphonota. It falls in naturally after 

 Dolba. It certainly does not belong with Macroglossa. 



Ceratomia has a more retracted head, smaller eyes, and longer, ob- 

 tusely terminated abdomen. The larval character of C. quadricortiis (4 

 short horns on shoulder) is so peculiar that I should expect that more 

 differences will yet be discovered in the imago. The genus should pre- 

 cede Sphinx in cataloguing. 



Pachylia, Philampdus and Deilephila agree in having a larger head, 

 more prominent eyes, and robust thorax, with the insertion of primaries 

 further back than in Sphinx. The legs are longer, less robust, and the 

 fore legs especially are longer and weaker than in Sphinx. The primaries 

 are wider, slightly excavate below apex and above hind angle. Second- 

 aries with distinctly marked anal angle. 



The differences between this series and the series Sphinx are difficult 

 of enumeration because mostly comparative, but I think the foregoing 

 will serve to separate them. 



Inter se these genera are distinguishable — Pachylia by its very large 

 size and obtusely terminated abdomen; Philampelus by conic abdomen, 

 long fore tibia and unarmed (i.e. no armature other than the ordinary 

 spines) tarsi; and DeiUphila by having the fore tibia at tip, and the tarsi 

 at the sides furnished with longer claw like spines. I cannot separate 

 Argeus from Philampelus. 



Amphonyx and Dilphonota have still more prominent head, narrower 

 thorax still more produced in front of the base of primaries, very long 

 conic abdomen, and long,, pointed primaries. Amphonyx antczus is a 



