POPLAR CATERPILLARS. 463 



teeth, making a deeper and narrower sinus above the vein than in C. unijuga. Sub- 

 terminal line upright, dentate, the shade preceding the blackish line distinct. Ter- 

 minal line appearing as black lunulated interspacial marks. Hind wings bright red, 

 somewhat pinkish. The black median band is straight, not regularly curved as in 

 C.parta, and straighter than in C. unijuga, rather narrow, nowhere greatly exca- 

 vated, rounding and narrower on the interspace between veins 1 and 2 opposite the 

 excavation of the marginal band, arrested at vein 1, but a few blackish scales mark 

 its continuance towards the internal margin. Marginal band narrower than in 

 C. unijuga. Cilife white, with a few red scales at base, especially at the apices. 

 Beneath, the nledian band of the hind wings is narrower than above, with the same 

 peculiarities, constricted at veins 2 and 5, and continued by scattered scales beyond 

 vein 1. Expanse of wing TS"""" (Grote). 



38. Catocala relicta Walker, 



The caterpillar of this moth is said by Mr. Hulst to feed on the silver 

 poplar and white birch. The moth has white forewiugs which are 

 more or less powdered and shaded with black ; it is easily recognized 

 by the even white median baud on the otherwise black hind wings. 

 It expands 80 to 85»". (Hulst.) 



Moth. — Male. Black, speckled with white, white beneath. Thorax in front white, 

 with black bands. Abdomen above blackish, whitish between the segments, and 

 with a white apical tuft. Forewiugs with two white bauds, which include a black 

 white-speckled band, and the latter is interrupted in the middle by a black ringlet; 

 the exterior band contains a zigzag transverse black line; exterior border and ad- 

 joining part almost white, with deep black marginal lunules. Hind wings blackish 

 brown, with a regular curved white band and with white cilise. Length of body 

 14 lines ; of the wings 32 lines. (Walker). 



39. Catocala unijuga Walker. 



Two caterpillars of this moth were obtained by Dr. D. S. Kellicott at 

 Buffalo, N. Y., from the trunk of a Populus candicans. "They had 

 passed their last molt when taken ; although they continued to feed 

 in confinement for five or six days they increased in size but little dur- 

 ing that time; their habits were strictly nocturnal. When first 

 observed they were clinging to the bark beneath a limb, lying obliquely, 

 and so flattened and leach-like that together with their gray color and 

 lateral fringes blending with the bark, they were difficult objects to 

 discover. June 22 the larvse ceased to feed. On the following day 

 they had fastened together some leaves by means of a silken gauze, 

 brownish in color; by the 26th both had transformed." The moths ap- 

 peared July 15. (Can. Ent., xiii, p. 38.) 



Larva. — Body attenuated towards each end, especially towards the head. The gen- 

 eral color is gray above, below pink with a subelliptical black spot to each segment, 

 those on the thoracic rings not conspicuous. The head flattened, slightly bilobed, 

 lighter in hue than the body and bordered by a well defined black line. The lighter 

 head lobes under a hand lens appear mottled and reticulated with black lines and 

 blotches. The dorsal line is white, made up of patches, illy defined circles and spots 

 alternating; on each ring on either side of the line are two white papillae from each 

 of which arises a white hair; above the stigmata there is a white interrupted line, 

 below them a black line also interrupted. The stigmata are rather large, elliptical. 



