206 LEPIDOPTERA OF NORTH AMERICA. 



Pupation. The larval transformation is subterranean. Pnpa 

 dark brown, smooth cylindrico-conical, tongue-case not apparent. 

 The larva reaches maturity about the beginning of September, 

 and appears as an imago during the following May or June. 



Food-plants. The larva feeds on the leaves of Ulmus ameri- 



cana, the American Elm. 



Massachusetts ; Pennsylvania ; Michigan. 



Clemeks. 



2. C. repentinus Clemens. 



Head and thorax dark gray, paler on the sides ; prothorax with 

 two black transverse lines, the first edged above with luteous 

 scales ; tegulse with a central black stripe. Abdomen dark gray, 

 pale gray on the sides, with a slender dorsal black line and with 

 two black stripes on each side. Anterior wings pale or rather 

 deep cinereous, varied with black and white ; two black lines arise 

 near the basal portion of the inner margin and cross the disk to 

 the costa, sometimes indistinct or obsolete in the middle; a black- 

 ish costo-discal patch containing a short black discal streak; discal 

 spot white and black margined ; two distinct sets of double, ser- 

 rated, undulating black lines cross the middle of the nervules, and 

 are separated by pale grayish or whitish, with an irregular whitish 

 line near hind margin ; a black apical line margined with whitish, 

 and black streaks in the two last median interspaces ; fringes white, 

 spotted with dark brown. Posterior wings blackish gray, with 

 three parallel, narrow undulating black bands ; fringes white, 

 spotted with dark brown. 



Food-plants. I have been assured by various collectors that 



the larva feeds on the ash; none of them, however, were able to 



describe it from recollection. 



Michigan; Connecticut; New York ; Pennsylvania. 



Clemens. 



N. B. This insect is probably Sphinx Ironies of Drury. See 

 page 191. (B. Clemens.) 



SMERINTHUS Latr. 



Size moderate or large. The body is robust and thick, with 

 the tip of the abdomen turned upward in the males. The head is 

 small, sessile, sometimes sunken and depressed ; the front mode- 

 rately broad, vertical, pilose or subtufted : the eyes small scarcely 



