﻿ISO CLEMENS' SYNOPSIS OF 



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 ITlmus Americana, the American Elm. 



Geographical distribution. — Massachusetts, Pennsylvania, Michigan. 



Measurements — a Female. 





HEAD. 



THORAX. 



ABDOMEN. 



BODY. 



ANT. WING. 



Length. 



Breadth. 



Length. Breadth. 



Length. Breadth. 



Length. 



Length. 



2-50 



3-00—2-00 



6-00 ■ 5-50 



14-00 6-00 



22-00 



26.00 



83. C REPENTINTJS. 



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 disc to the costa, sometimes indistinct or obsolete in the middle ; 

 a blackish costo-discal patch containing a short black discal streak ; discal spot white and black margined ; 

 two distinct sets of double, serrated, 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, spitted with 

 dark brown. Posterior wings blackish gray, with three parallel, narrow undulating black bands ; fringes 

 white, spotted with dark brown. 



From collections of Messrs. Edward Norton and W. H. Edwards. 



Egg. ? 



Young Larva. ? 



Mature Larva. ? 



Pupation ? 



Foodplants. — 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. 



Geographical distribution. — Michigan, Connecticut, New York, Pennsylvania. 



Measurements — a Female. 





HEAD. 



THORAX. 



ABDOMEN. 



BODY. 



ANT. WINGS. 



Length. 



Breadth. 



Length. Breadth. 



Length. Breadth. 



Length. 



Length. 



2-25 



? 1-75 



5-25 4-75 



13-50 5-00 



19-00 



24-50 



Genus 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 moderately broad, vertical, pilose or sub-tufted : the eyes small 

 scarcely prominent or visible from above ; the palpi thick and short, but equal to the 

 front ; the tongue almost as long as the palpi ; the antennae usually , without the 

 terminal hook, without distinct seta, and about as long as the thorax. Thorax short, 

 almost globose and but little advanced. The abdomen cylindrico-conical, more than 

 twice longer than the thorax. Wings without bristle and hook. The anterior are 

 longer than the body, and about twice as long as broad ; the hind margin angulated 



