292 [December 



ged with red. It is 2 inches long by .6 in. broad; cylindrico-conical; tho- 

 racic diameter nearly equal to abdominal; slightly compressed laterally, 

 behind the base of. the wing cases; terminal segment not blunt, but taper- 

 ing to the spine; head case not projecting, extending vei-y little beyond 

 the base of the antennae cases which are full, rounded, showing distinctly 

 the joints; tongue case buried; thoracic stigmata broadly open, semi-oval; 

 abdominal rings puuctulated and wrinkled, except on their posterior third; 

 terminal spine short, stout, rough, rather blunt. 



The above metamorphoses, through which, in the space of forty-two days, 

 the egg passes into the pupa, are naturally divisible into the seven follow- 

 ing periods: from the deposition of the egg to the development of the 

 larva — from the larva to its first molting — the three intervals between the 

 moltings — from the last molting to maturity — and from maturity to the 

 pupa. These periods show an interesting uniformity in length, — five of 

 the seven consisting of sis days each; had fractions of days been noted in 

 the observations, it is probable that the variation of one day each, shown 

 by the remaining two, would have been diminished. 



The Imago, after having passed the winter in its pupa state, makes its 

 appearance usually in the month of June. I regret that I am unable to 

 give this period with greater precision, but having had the larva to enter 

 the gTOund for pupation as early as Aug. 3rd, and as late as Sept. 17th — 

 a range of seven weeks, — a corresponding difference in the time of the ap- 

 pearance of the imago, is presumable. Occasionally its transformation is 

 delayed until the following spring. Of several pupae obtained in the fall 

 of 1861, two, at the present time, are still in the pupa state, to all appear- 

 ances in good condition, while others of the number, subjected to the 

 same treatment and exposure, made their escape at the usual time. This 

 protracted pupation has been previously observed in some of the Sphing- 

 idae. It has come under my personal observation only in the species un- 

 der consideration, in Sphinx drupifc/rarimi Sm. Abb., and Sphinx quin- 

 quemaculata Harris. 



While the larva of C quadricoi-nis is not rare in this locality — each 

 year furnishing me with individuals — I have captured the imago but once 

 during several years of collecting. Should the larva be so fortunate as to 

 avoid discovery by the keen eye of a bird, during the earlier stages of its 

 growth, its large size as it approaches maturity, and color differing mater- 

 ially from that of the leaf on which it feeds, allow it rarely to escape the 

 eager search of its natural parasite. Once discovered, its little enemy 



