252 William T. M. Forbes 



dicularly and then curving around parallel to Cu 2 and M 3 ; 1st A long. Hind 

 wing much, broader than fore wing, folded tinder it in the resting position, 

 the wings rolled about the body. Hind wing with R and Mi stalked, often very 

 shortly; M 2 slightly separated from M 3 , or shortly stalked when M 3 is long- 

 stalked; M 3 stalked or connate with CUi, Cu : arising well back from end of 

 cell, and straight. 



The genus is very large in South America, and varies enormously in structure 

 as well as in pattern; but has not as yet been successfully divided. We have 

 three main subgroups 1, Stencmia proper, with Cu 2 normally free in the fore 

 wing, M 3 and CUj connate in hind wing, and white wings characteristically marked 

 with gray; the thorax with a metallic posterior tuft; 2, Brachiloma Clemens 

 (Ide Chambers) with Cu a and Cu 2 stalked, M 3 and Cu x of hind wing typically stalked, 

 and no metallic tuft; 3, a group containing S. mistrella Busck, with marked apex 

 and with R 4 and R 5 forking over it. 



The caterpillar is as noted in family description. It has primary setae only, and 

 tubercle iv+v of the abdomen directly below iii. The pupa is described under the 

 family. 



Key to the species 

 1. White marked with gray. 



2. Larger; terminal line light gray, continuous, followed by black bars in 



base of fringe 1. schlcegeri. 



2. Smaller; a series of black terminal bars on membrane, not preceded by 



a fine gray line 2. algidella. 



1. White, practically immaculate 4. vestalis. 



1. Gray with complex darker pattern 3. humilis. 



1. Not white; with darker discal dot only. 



2. R 5 to outer margin, apex marked 8. mistrella. 



2. R 5 to costa; apex often bluntly rounded. 



' 3. Ground light dull ochreous, with strong discal dot 5. unipunctella. 



3. Ground chocolate brown, hind wing cream, contrasting. .. .6. decorosella. 

 3. Ground gray 7. querciella. 



1. S. schlaegeri Zeller. White; fore legs smoky; middle tarsi ringed with gray. 

 Fore wing with a double gray basal line from costa; a conspicuous, mixed gray 

 and black, somewhat raised patch on inner margin from basal angle almost to 

 middle of fore wing, formed of more or less confluent waved bands; discal bar 

 gray, edged finely with white, and then broadly and irregularly with gray, and 

 usually with a gray band running to inner margin; broad, even, pale gray post- 

 medial and subterrninal bands, and a very narrow terminal one cut into spots. 

 A black line, usually broken, in base of fringe; much more contrasting than the 

 terminal line. Hind wing pale gray with white fringe. Thorax with prominent 

 lead-colored posterior tuft. Male with simple curved uncus and very broad sub- 

 scaphium broadly notched at tip. Fore wing with CUj and Cu, usually connate, 

 separating at right angles; M 3 and CUj of hind wing connate. 30 mm. (H 48:41). 



General in distribution and not rare, in May and June. Caterpillar on oak. 

 New York: Mt. Marcy, Rock City ( Cattaraugus County ) , Ithaca, McLean, Big- 

 Indian Valley, Bethlehem, New Windsor. 



2. S. algidella Walker. Very similar to 8. schlcegeri, with very little or no 

 black toward base of inner margin, but in the northern form with a large gray 

 patch. Terminal line broken into dots, dark gray and contrasting; dark dots 

 in base of fringe obscure, paler. Uncus of male with broadened bifid tip, sub- 

 scaphium simple, slender, ending in a sort of beak. Cu 2 of fore wing well separated 

 from C^ (fig. 152) 15-23 mm. {leucillana of authors, not Zeller). 



The distribution is general and the species is not rare in June and August. The 

 caterpillar is common on maple and various trees and shrubs, and has been found 



