124 LEPIDOPTERA OF NORTH AMERICA. 



or less beyond the hind wings. Legs stout, pilose ; hind tibiae 

 with four short spurs. Wings rather long, hardly broad. Prima- 

 ries hardly convex along the costa, rounded at the tips, very 

 oblique along the exterior border ; first and second inferior veins 

 almost contiguous at the base ; third near the second and about 

 twice further from the fourth. Female with a serrated oviduct. 



1. C. robiniae Peck. Mass. Agric. Soc. Report, V, 67. 



Male. Dark brown. Primaries paler brown, hoary along, the 

 interior border, with irregular blackish reticulations, and with a 

 discal blackish stripe composed of five large irregular spots. 

 Secondaries pale luteous, black to about half the length from the 

 base and along the costa. Female. Hoary, shaded with pale 

 brown. Thorax with three slender black stripes. Primaries with 

 irregular blackish reticulations, and some discal and anterior black 

 streaks. Secondaries dark brown or blackish, paler towards the 

 margin, more indistinctly reticulated. Fringe with black dots. 



The larva bores the locust tree (Robinia pseud-acacia). 



United States. — Male expands 1 J inch. Female 2 to 2J inches. 



2. C. populi Walker. C. B. M., Part VII, p. 1515. 



Female. Cinereous. Antennae black, very minutely serrated, a 

 little longer than the thorax. Palpi black, extending as far as the 

 head. Legs with whitish bands. Wings slightly reticulated, with 

 very numerous minute transverse blackish streaks. Primaries with 

 two very slender irregular blackish bands ; one at beyond one 

 third of the length ; the other sub-apical and forked in front. 

 Length of the body 14 lines. Wings expand 28 lines. 



Hudson's Bay. 



Walker. 



3. C. plagiatus Walk. C. B. M., Part VII, p. 1515. 



Male. Hoary. Palpi not extending so far as the head ; third 

 joint very minute. Thorax with a slender black stripe along the 

 inner side of each scapula. Tarsi gray, with whitish bands. Pri- 

 maries reticulated with gray, narrower and much more oblique 

 than those of G. populi; a brown patch with hoary dots on the 

 middle of the interior border, and an irregular, sub-apical oblique 

 band of the same hue. Secondaries gray, hoary and indistinctly 

 reticulated with gray along the borders ; fringe of the four wings 



