Lepidoptera of New York and Neighboring States 691 



yellow, except for the dark brown border, and intergrades with the type form. 

 25-35 mm. (H 41:24.) 



May to September; two broods. Caterpillar on Viburnum. 



New Jersey to Ohio and north. New York: Peru, Fentons (Lewis County), Mt. 

 Marcy, Ithaca, Big Indian Valley, Albany, Rhinebeck, Poughkeepsie, Staten 

 Island, Brooklyn. I have seen variety marginata Walker from "New York City 

 and vicinity" (Eliot), and a transitional specimen from Ulster County. 



2. 0. irrorata Packard. Ground wholly strigose dull brown or brownish crim- 

 son, without any yellow; markings as before, the postmedial sometimes double 

 or almost obsolete. 25-35 mm. (H 41:6.) 



With the preceding form, but apparently much rarer and local. 



Massachusetts and Pennsylvania to Manitoba. New York: Mt. Marcy, Ithaca. 



Memoir 66, Simplified Apparatus and Technique for the Electrometric Determination of 

 Hydrogen Ion Concentration in Milk and Other Biological Liquids, the third preceding 

 bumber in this series of publications, was mailed on June 26, 1923. 



