Packard.] 1.0 ji [March 17, 



spines are distinctly ivory-white on the outer side from the base up to the 

 dark tip. The spiracles are much larj^er llian before, distinctly interrupt- 

 ing the dark purple spiracular line which is paler than before. 



iStage IV. — Molt not seen, but it probably occurred August 1 or 2. 

 Lengtl), 25-28 mm. The head is, as before, with two yellow stripes, one 

 <m each side, and bordered more or less on each side, esi)ecially in front^ 

 witli black. The four pairs of thoracic horns are now but little longer than 

 the body is thick and are reddish flesh-color, dark at the slender forked 

 lips, and yellowish green at the base.* The "caudal horn" is now con- 

 siderably shorter in proportion than before, being about two-thirds as long as 

 the body is thick, and is of the same peculiar deep flesh red as the thoracic 

 horns. The sharp, stout, spine-like tubercles on the fourth and sixth 

 abdominal segments are slightly over twice as large and thick as the 

 other dorsal tubercles which are as in the previous stage, and bear a ver- 

 ticil of from three to five short blunt spinules ; they are now silvery white 

 on the outside (Jewett says burnished silver). The lateral yellow, car- 

 mine, white and blue bands are much as before. The increase in size of 

 this stage over the preceding one is noticeable. 



In his account of this stage Jewett states that the head is "green, 

 bilobed, minutelj' pubescent," also that the thoracic horns had lost their 

 knobs at their extremities ; but this appears to take place at the time of 

 the second molt. 



In a larva 20 mm. long, and probably of this stage, the lateral band is 

 tricolored, marked below with straw-yellow, the yellow enclosing the 

 base of the black spines. Jewett says: "The legs of some larvae are 

 green and of others brown. Prolegs of some green and in others green 

 tipped with brown. In some larvaj the stigmatal space has numerous 

 small, black tubercles on each segment ; in others there are no black 

 tubercles." 



The following description of another larva, drawn up October 10, and 

 probably in the fourth stage, may be useful. 



Stage IV (?) — Length, 24 mm. Body rather thick. Head remarkably 

 Sphinx or Smerinthus-like, as wide as the body, flattened in front, broad 

 below about the mouth, but narrowing towards the vertex, as in Sphinx ; 

 the skin rough ; with two lateral, rather broad, yellow lines, which arise 

 Irom the base of the antenn* and converging nearly meet on the ver- 

 tex ; across the upper division of the clypeus is a blackish band which 

 adjoins a black blotch on each side, and which touches the yellow line. 

 Labrum pale yellowish, blackish in the middle ; eye-patch and mandibles 

 black. 



Prothoracic segments very slightly wider than the rest of the body in 

 front ; the front edge flaring and rising up somewhat collar-like ; this 

 edge armed with a single row of white tubercles, about ten on each side 

 of the segment, those above nearly adjoining at base and tinged with 



* Jewett says the spines are " brown m some larvce and green in others." 



