520 



NEW YORK STATE MUSEUM 



growth early in October and pupating' within a thin cocoon between the 



leaves, the moths appearing the following June. 



Food plants. This species displays a marked preference for oak. It 



is also injurious to maple, as stated by Dr Fletcher, and Dr Packard has 



observed it at Brunswick Me. on beech. It is widely distributed, ranging 



from Georgia and Te.xas north into Canada and westward to at least 



Minnesota. 



Rosy hyparpax 



Hxparpax aurora Abb. & Sm. 



A greenish caterpillar about i \- inches long, with a red head and conspicuous 

 pointed elevations on the first and eiglith abdominal segments and variable l)rown and 

 yellowish or pinkish dorsal markings, occurs on different species of oak durini; midsummer. 



This, one of our most striking caterpillars, is rarely abundant. It may 

 be recognized by its very peculiar angulate appearance, due to the unusual 

 elevations on the first and eighth abdominal segments and to the slender 

 anal prolegs, which are produced posteriorly. The strange effect is further 

 hightened by the cateri)illar's habit of carrying its posterior extremity in 

 an elevated position. The young larvae are variably marked with yellow, 

 yellowish orange and lilac or purple, and in the earlier stages the angular 

 projections are comparatively much greater than in the full grown larva. 



Description. The parent insect is a pretty yellowish, rosy marked moth 

 having a wing e.xpanse of about one inch. The yellowish forewings are 

 marked with pink as follows : an angulate line near the base of the wings, 

 a short, oblique one near the middle, a wavy, subterminal one and the outer 

 edge of the wings. The hind wings are either unspotted or with a pink 

 line alonsr the edge. 



The color scheme of the nearly full grown larva has been given by 



Dr Packard as follows : 



The body is now a deep delicate pea-green, with a large reddish brown 

 triangular patch extending from the prothoracic segment next to the head 

 and ending at the anterior base of the tubercles on the first abdominal seg- 

 ment. Behind the said tubercles a broad reddish brown patch extends to 

 the large tubercles on the eighth segment, the band being edged with whit- 

 ish yellow ; from the rear of the tubercle a similarly colored band extends 



