1893.] l0< [Packard. 



The horns in Sphingicampa are not held spread out as in C. regalis, but 

 those of each pair are constantly held close to each other. The horns 

 and the six silvery, opalescent, shining tubercles probably become terri- 

 fying by the movements of the larva. The latter are turned on and throw 

 their light out suddenly like flashes and may thus have a deterrent effect 

 on their enemies. 



Life History of Eagles imperialis (Drury). 



The eggs were received from Mr. James Angus, and the larvae hatched 

 from them reared in Maine, so that their development, owing to the 

 cooler climate, may have been less rapid than in New York, where the 

 eggs were laid. 



Egg. — Length, 3 mm.; breadth, 2.5 mm.; thickness, 2mm. Flattened 

 elliptical, each end alike, white, with an equatorial, smooth, distinct 

 ridge. The shell is white, the surface under a high-power triplet is seen 

 to be finely pitted, the pits being shallow and not closely crowded. Under 

 a half-inch objective the pits are seen to be shallow, and not often with a 

 definite raised edge ; often there is a boss or bead in the centre. Arising 

 from the spaces between the bosses are slender, short, very minute hairs, 

 originating from a swollen base. Under a one-fifth objective, as well as a 

 one-half and a triplet, I cannot distinguish between the microscopic struc- 

 ture and markings of imperialis and regalis. 



The FresTdy HatcJied Larvm. — Some were seen drawing themselves out of 

 the shell June 30, at noon. Length in a few minutes after hatching 

 7-8 mm.; width of head, 1.5 mm. The tubercles and spines become erect 

 before the larva entirely deserts the shell. 



The head is large and full, smooth, shining, nearly twice as wide as the 

 body behind the middle, but the prolhoracic segment is much wider than 

 the body ; the prolhoracic segment is above of the same color and the 

 surface shines like the head. The body is pale chestnut, with a slight 

 pinkish tint. All the spines are, before it entirely leaves the egg, shining 

 jet-black ; the five longest ones (four thoracic and one median abdominal) 

 bearing white hairs, the end hairs on all the shorter ones being black. 

 The thoracic segments are without transverse dark stripes, but on each of 

 abdominal segments 1-7 there are three transverse, distinct, conspicuous, 

 black dorsal stripes ; the first one in front of the spines is broken, and 

 wanting on the first abdominal segment ; but the two behind are un- 

 broken and extend a little below the position of the spiracles. The 

 spiracles are hard to detect as they are situated on an oblong or fourth 

 transverse black band between the two lateral spiracles. The eighth and 

 two last segments are not banded. The large anal legs are edged with 

 black behind. The thoracic legs are black. 



There are four spines on each side of the prothoracic segment, all of 

 very unequal length ; the lowest one minute and bifid ; the one in front 

 of the spiracle stumpy and ending in five slender, papilliform, piliferous 



