Sphingidae 
has at the anal extremity a very long caudal horn, which begins 
gradually to curl up, as represented in the accompanying cut, 
and after the third molt entirely disappears, being replaced by 
a lenticular shining eye-like prominence. In the latter stages of 
development the larvae frequently become dark brown, and 
Professor Riley maintains that this is invariably the case in the 
neighborhood of the city of St. Louis. It is not invariably the 
case in other localities, as I know from experience. I have 
reared a number of specimens in which the green color perdured 
to the time of pupation, though the brown form is very common. 
Like the larva of the following species, the caterpillar of P. 
satellitia has the power of withdrawing the first two segments 
of its body into the third, when at rest, or when suddenly alarmed. 
When crawling or feeding the first segments are protruded, as 
represented in the cut by the larger figure. 
Several local races of P. satellitia are recognized as occurring 
in the Antilles and in South America, one of these, for which 
Mr. Grote proposed the name posticatus, occurs in Florida, as 
well as in Cuba and the Bahamas. It may be distinguished from 
the form pandoras by its slighter build, its narrower wings, which 
in the case of the primaries have the outer margin straighter than 
in pandoras, and by the presence of a large roseate spot cover¬ 
ing the anal angle of the secondaries. There are other differences 
of a minor character, but those mentioned will enable the student 
to discriminate this form from the one we have figured. 
(2) Pholus achemon Drury, Plate III, Fig. 5, $. (The 
Achemon Sphinx.) 
Syn. crantor Cramer. 
Like the preceding species the caterpillar of this beautiful 
hawkmoth feeds upon vines, and shows especial fondness for 
Fig. 28 —Larva of Pholus achemon. (After Riley.) 
the grape. It is also addicted to the Virginia creeper (Ampe- 
lopsis). The description of the habits of the larva given by 
66 
