Morrison.] 194 [Jan. 1, 



Section of Entomology. January 1, 1874. 



Mr. E. P. Austin in the chair. Twelve persons present. 



The following papers were read : — 



New North American Lepidoptera. By H. K. Morrison. 



Family Geometridje. 



Genus Acidalia. 



Acidalia albogilvaria (sp. nov.). 



Expanse 18 mm. Length of body 6 mm. 



Head, antennas, palpi and body, pure white. Anterior ■wings 

 white, crossed by three distinct, wavy, ochreous lines, with two other 

 fainter lines, which sometimes are only represented by costal spots 

 or submarginal lunules. The first basal line is sometimes rudimentary, 

 forming a spot on the costal margin, in some specimens extending 

 faintly across the wings. The second is distinct, less wavy than the 

 third, extending across the wings. The third and fourth lines 

 are distinct, subparallel, broken into short waves between the nerv- 

 ules, much more marked than in the second line. They are distant 

 about 1 mm. from each other, and 2 mm. from the second line. 

 The fifth line consists of a faint costal spot, in some specimens 

 prolonged into a faint interrupted submarginal line. Posterior wings 

 above, with the third and fourth lines continued, distinct, slightly 

 more regular than on the anteriors, extending across the wings. 

 Fifth line represented by a few submarginal spots, sometimes com- 

 bined into a faint line. First and second lines obsolete. Discal dots 

 small, black, distinct, situated between the second and third lines, but 

 not touching either of them; on the posteriors, situated before the 

 third line. Anterior wings beneath white; discal dot larger than 

 above, linear. Costal margin with ochreous spots and discolorations 

 more conspicuous at the apex. Posterior wings beneath pure white, 

 without discal dot. No traces of the ochreous lines on the under sur- 

 face. Fringe long, white, concolorous. 



Hab. Massachusetts, New York. In July. Collection of H. K. 

 Morrison. 



This species is allied to Acidalia peralbata Packard, from which it 

 differs by the absence of marginal black dots on the anteriors, and by 



