1913] Barnes and McDunnough — Western Catocala 197 



which is slightly raised. Very similar to the egg of C. fausiina. Diameter, 1.25 

 mm. 



Stage I. Head red-brown. Body when first emerged blackish, later dirty 

 green shaded with purplish anteriorly and posteriorly, with three pale lateral lines; 

 tubercles small, black, with short setae. Beneath paler with faint central dark 

 blotches. Length, 5-6 mm. 



Stage II. Head pale creamy, cheeks slightly marbled with light brown; body 

 light brown, the three pale lines have broadened into waved stripes bordered with 

 darker lines; a pale dorsal stripe, expanding more or less into diamond patches 

 and with trace of centro-dorsal line; 5th abdominal segment with slight trans- 

 verse black wart from sides of which an oblique black patch extends backward and 

 downward to just above the prolegs of 6th segment; a lunate dorsal black line on 

 8th abdominal segment the dorsal tubercles of which are slightly raised and conical; 

 all other tubercles very minute; prolegs pale. Length, 15 mm. 



Stage III. Head creamy tinged with orange below the apices of the lobes, 

 pale brown frontal marbling, two lateral deep brown lines on the cheeks. Body 

 pale gray-green, having a general marbled appearance; marking essentially as in 

 previous stage, the pale stripes however are scarcely distinguishable and the brown 

 borderlines appear prominent, giving the appearance of 7 waved lateral lines and 

 a similar dorsal one; rear portion of 5th abdominal segment velvety-black, this 

 color extending obliquely downwards to prolegs of 5th and 6th segments; a small 

 dorsal wart tinged with orange situated in this black area; tubercles pale orange, 

 tubercle II on 7th abdominal segment tinged posteriorly with black, on 8th with 

 a black lunate dorsal mark, slightly broken in the center posterior to this tubercle. 

 Length, 25 mm. 



iSVa^e IV. Head creamy, apical portion of lobes orange below which is pale 

 brown marbling, cheeks with dark curved border-line. Body pale gray-white, 

 the blackish border-lines resolved into dots giving a general marbled appearance; 

 transverse orange wart on 5th abdominal segment with the black shading of the 

 previous stage less pronounced, only traces of this color being visible above the 

 prolegs; tubercles orange, tubercles II on 8th and 9th abdominal segments being 

 situated on conical prominences, the former the larger; lunate black mark on 8th 

 as before but unbroken; dorsal diamond patches on abdominal segments shaded 

 with pale orange-brown. Length, 30 mm. 



Stage V. Head pale gray; apical portion of lobes with rather prominent tubercle 

 shaded broadly with orange; purplish marbling and black lateral border as before. 

 Body round and smooth, pale whitish gray, heavily sprinkled with black dots which 

 tend to form wavy longitudinal lines; pale dorsal diamond patches faintly visible, 

 slightly tinged with ochreous; prominent reddish ochreous hump on 5th abdominal 

 segment at times with traces of the black lateral shading of former stages, often 

 entirely without this; lunate mark of 8th abdominal segment less distinct than 

 before, tubercle II prominent, conical; legs flesh-colored; filaments grayish. Be- 

 neath white with the usual dark central patches. Length, 60 mm. 



Food-plant: Poplar. 



The ova start hatching soon after the first warm weather in 

 spring the period of emergence extending over several Aveeks. 



