Sphingidse 
which run into each other to such an extent as to make it often 
impossible to distinguish them. These forms are Sphinx astarte 
Strecker, in which the outer margin of the fore wing is a little 
less dentate, and the brown markings of the same wing are a 
little narrower; Sphinx ophthalmica Boisduval, which has rather 
pale fore wings; Sphinx pallidulus Henry Edwards, in which 
the color of the fore wings is cinnamon-gray; and Sphinx saliceti 
Boisduval, in which the blue markings of the ocellus on the 
hind wing do not form a ring, but appear as two opposed 
crescents. 
The insect is comparatively rare in the eastern part of the 
continent, but is not uncommon in the western States. It 
ranges from Canada in the north to the upper portions of the 
Gulf States, and westward to the Pacific, extending its habitaf 
southward along the high lands of Mexico. 
(2) Sphinx jamaicensis Drury. 
Normal form geminatus Say, Plate IV, Fig. n, $. (The 
Twin-spot Sphinx.) 
This beautiful hawkmoth was originally named and described 
in error by Drury as coming from the Island of Jamaica. He also 
was so unfortunate as to have had for his type an aberrant speci¬ 
men in which the ocellus of the hind wing had but one blue 
spot. Such specimens now and then occur, and have been 
obtained by breeding from the normal form, to which Say gave 
the nam e geminatus. Specimens also sometimes occur in which 
there are three blue spots in the ocellus, and Mr. Grote gave to 
this aberrant form the name tripartitus. 
The caterpillar feeds upon willows, birches, and various 
species of wild-cherry. The insect is quite common in the 
Middle Atlantic States, and ranges from southern Canada to the 
Carolinas and northern Georgia, and westward to eastern Kansas 
and Iowa. 
Genus CALASYMBOLUS Grote 
The genus differs from Sphinx in the fact that the head is 
crested, and the hind wing is on its costal margin toward the 
apex produced into a somewhat broad lobe. There are three 
species recognized as belonging to the genus, all of which we 
figure. 
55 
