INSECTS AFFECTING PARK AND WOODLAND TREES 



559 



Viceroy 



+r Basilarchia archippus Cram. 



A somewhat tuberculate, angular, reddish brown, yellowish marked caterpillar i-i/^ 

 inch long, feeds singly on willow and poplar. 



The parent insect is a very striking and common butterfly in the Adi- 

 rondacks, having a wing spread of about three inches. It may be instantly 

 recognized by the broad, oblique, white band extending across the middle 

 of both the fore and hind wings. The caterpillar is rather curious in 

 appearance and has a red or purplish brown head ornamented with many 

 reddish brown tubercles. The thoracic segments are somewhat enlarged, 

 dull dirty brownish yellow or clay brown and with darker markings. The 

 middle segment bears a pair of long, spiny tubercles. The rest of the 

 body is a dark brown, olive or dark reddish, tinged in places with brownish 

 yellow, occasionally running into black, and on the middle of the back is 

 a large saddle-shaped spot of a dirty dull cream color, usually slightly 

 tinged with green. While this species is abundant in the Adirondacks, the 

 caterpillars are rarely numerous enough to cause material injury. It feeds 

 by preference on poplars and willows and it has also been taken on other 

 trees such as apple, plum, cherry and it is said to occur on oak. 



Harpyia cinerea Walk. 



A peculiar, light green, brown-marked caterpillar with a pair of long, slender, 

 annulated caudal appendages, occurs on willows and poplars. 



This insect is interesting largely because of the very peculiar cater- 

 pillar which, when at rest, appears somewhat like a linear brown scar on a 

 leaf. This peculiar form and coloration is undoubtedly a protective device. 

 This species is so rare that it can not be considered dangerous. A male is 

 represented on plate 44, figure 7. A larva, probably of this species, is 

 illustrated on plate 16, figure 10. 



