A. R&R. Grote—Sphingide of North America. 213 
learn from Butler's treatise, and it is clear that ours must have 
symbolus. Our remaining Smerint hoid re Juglandis, differs 
more strongly than almost any structural fori in the group 
from its allies. Confounded by Hubner with the rest of the 
gray Smerinthi under Polyptichus, it has been properly made the 
type of the genus Cressonza Grote and Robinson. The preju 
dice against the use of Hubner’s genera will not find favor with 
those whose wren concern is the fact which lies beneath the 
term, and not the name used to show that it is apprehended. 
e have, then, “Ahves proximate sources for our Sphingid 
nd which to-day consists of ninety-two or three s 
That this number will not be greatly exceeded by future dis- 
coveries may be safely assumed. Although local species may 
await capture in New Mexico, Arizona or Southern California, 
the comparatively wide range and the muscular activity of these 
insects preclude the idea that this number will receive acces- 
sions as in the past. It has trebled since Harris's time, but the 
principal additions now seem likely to be from stragglers over 
_ our southern borders not yet noted in our lists. Again, in 
the genus Hemaris it may be that one or two names will drop 
from the list. Until all the facts are known, through a careful 
breeding of the species, it will not do to be hasty in drawing in 
any existing names in our comparatively small number of 
8 
cies, 
The three elements, from as many sources, in our Sphingid 
fauna, are found first in descendants of a former ee 
fauna; secondly, in accessions from the tropics, a movement 
from south to north Neing still in progress ; thirdly, in Abc 
genera which have originated within our limits and are pecul- 
iarly North American in character. We may thus tabulate the 
genera of North American Sphingide: 
1. Descendants from a Circumpolar Fauna. 
No. of Species. Genus. No. of teat 
ie idee ee PVEMOGON | oats: 
Poyototen 62 4 NEE 23 oo aes ; 
Deilephila .....--- mnie 4 oe. 15 
Ampelophaga _--. - 1 PION cs 3 
Smerinthus ......- ee 
smerinthus .... - 2 10 genera and 47 species. 
