BULLETIN OF THE BROOKLYN EST. SOC. 21. 



and the third half way between these. The back stigmata] spaces and 

 the under part of the body are strongly marked with red. The body is 

 cylindrical, hardly varying in size from one end to the other. There is no 

 caudal horn through all its history. The head is of medium size, light 

 yellowish green, edged along the collar with a blue line. There is a black 

 line running from each corner of the mouth to the summit of the head 

 and there the}' meet one another. The head is rounded somewhat conical 

 flattened in front. The length of the full grown larva is 2% to 3 inches. 



The egg is very dark green and hatches in 8 days. The larva devel- 

 opes to full size in about 6 weeks. It goes into the ground to pupate and 

 remains in the pupal state a month or more. There are at least 2 broods 

 each year. 



The pink color occurs in the larva only after the third moult. 



The most remarkable part of the history of the insect is the extraor- 

 dinary change which takes place in the shape of the head of the larva at 

 different periods of its growth. Immediately after birth it is round. 

 With the first moult it becomes angular and Smerinthus like. This is very 

 much increased with the second and third moults so that in these it is fully 

 4 or 5 times its width running up to a sharp point at the summit When 

 disturbed at this age the larva thrusts down the extremity of its head so it 

 lies straight in a line with the body. Ordinarily it carries the point erect. 



There is very much variation in the imagines. Front wings broader 

 or narrower, many uniform ash gray in color. Many have the two black 

 dashes near the middle of the fore wing. Some have only one. Some 

 have a band of lighter grey across the wings, and some have dark lines 

 and markings. Some apart from the color of the abdomen which remains 

 uniform exactly resemble Sphinx pinastri of Europe. 



Datana Floridana, Graef. 



The larva is black with 11 parallel yellowish lines running the full 

 length of the bod)'. There is one immediately between the legs under 

 the body — one on the line of and interrupted by the legs — the rest above 

 and equidistant from each other leaving the back with a somewhat broad- 

 er black space. The head, the summit of the body segment, the anal cover- 

 ing and the summits of all the legs are deep mahogany red in color. The 

 feet are all black; those on the last segment are partially aborted. It has 

 the habit which seem to be common to the genus of raising and throwing 

 back the head and tail over the body when disturbed. 



