End of May to June. 



Western Pennsylvania to Ohio. 



5. P. cesculana Riley. Darker olive green, more or less mottled with yellow 

 and gray, and with some small black markings. The most distinct gray areas 

 being a darker fascia from middle of costa toward anal angle, becoming diffuse 

 below, and a shade running to apex; often with a fine longitudinal black streak 

 at their junction. Fore wing below with black sex-scaling in a contrasting patch 

 a third the length of the wing; hind wing with sex-streak, below, lying well away 

 from costa; above, with one on each side of the costal hair pencil. 12-18 mm. 



June. The larva bores in the tender terminal twigs of maple and buckeye, in 

 May, causing them to wither. 



The distribution is uncertain, as a large part of the records for the genus have 

 been reported under this name. The species appears to be general. New York: 

 Ithaca. 



6. P. moffatiana Fernald. Bright green, mottled with black, heavily on basal 

 third and in the form of a curved band from middle of costa to apex. Sex-scaling 

 only along costal edge of hind wing, below; hair pencil concolorous and incon- 

 spicuous. 



June. Larva in petioles of maple. 



Canada to Pennsylvania. New York: Ilion, Lancaster, East Aurora, Ithaca, 

 Big Indian Valley. 



7. P. obnigrana Heinrich. Fore wing dull white, with olivaceous basal patch, a 

 fascia from middle of costa to anal angle, and a shade below costa near apex. A 

 thin black line from apex to near middle of wing, curving as in P. cesculana. Sex- 

 scaling of male diffuse, on under side of both wings, dark and fairly conspicuous. 

 16 mm. 



Dublin, New Hampshire; type only known. 



22. GRETCHINA Heinrich 

 (Thiodia; Proteopteryx, in part) 



Thorax with dorsal tufts; fore wing with more or less distinct tufts or 

 transverse ridges, at least in the fold. Outer margin concave, normally strongly 

 notched, with Mj to Cu a closely approximate at margin; R 4 and R<s stalked or 

 separate; R, from middle of cell; Cu 2 sinuate; costal fold absent. Hind wing 

 with R and M t approximate. Fore wing gray, largely formed of a mixture of 

 black and white, with a characteristic cusped black mark, more or less suggestive 

 of a bird's beak, below the apex. 



Valve simple; cucullus moderate; spiued area reduced and lateral and anal 

 spines strong; sacculus densely hairy on outer side. Uncus absent; socii markedly 

 chitinized, triangular, porrected; gnathos reduced and partly fused with socii. 



This genus is well marked superficially, really resembling only the Catastegas; 

 but in the forms with R 4 and R 5 separate, the only real diagnostic characters are 

 in the genitalia. 



Key to the species 



1. R 4 and R 6 stalked (fig. 260); tufting stronger as a rule. 



2. Hind wing white on basal half, contrasting with the blackish fore wing. 



3. watchungana,. 



2. Hind wing darker, pale only when fore wing is equally pale. 

 3. Gray without any brown tint. 



4. Fringe with 3 or 4 light and dark bars at apex; otherwise mostly pale; 



a pale species 5. deludana. 



4. Fringe with a single, strongly contrasting, oblique black liar in apex; a 

 dark species with mouse-gray hind wing 0. bolliana. 



