166 LEPIDOPTERA OF NORTH AMERICA. 



Food-plants. Epilobium angustifolium (great willow-herb). 



Canada — United States. 



Clemens. 



[Dr. Clemens regards this species, on the authority of Walker, 

 as identical with £). galii of Europe. — J. G. M.] 



PERGESA Walker. 



Body moderately stout. Proboscis long. Palpi as usual. 

 Antennae slender, rather longer than the thorax. Abdomen ob- 

 lanceolate, more than twice the length of the thorax. Legs long, 

 slender ; hind tibiae with four long spurs. Wings rather long, 

 moderately broad, very slightly denticulated along the exterior 

 border. Fore wings hardly convex in front, acuminated ; exterior 

 border rather oblique, very slightly undulating, its fore part very 

 slightly concave. Hind wings rounded at the tips. 



In the European Porcellus the head is free, short, obtuse, and 

 broad. The body short and stout. The palpi project beyond the 

 clypeus ; the eyes are quite small but salient ; the tongue scarcely 

 as long as the body ; the antennas rather clavato-prismatic, with a 

 short hook and seta. The thorax is short and obtuse in front. 

 The length of the anterior wings about equal to that of the body, 

 and are a little more than twice longer than broad across the inner 

 angle. The hind margin of the posterior wings is slightly wavy. 

 The individuals were formerly part of the genus Chcerocampa. 



Larva. Smooth, anterior segments retractile, with ocellated 

 spots on the sides of the fifth and sixth, and without a caudal horn. 



1. P. thorates Hiibner, Exot. Schmett. f. 525. 



Green, testaceous beneath. Head and thorax with a white line 

 on each side. Thorax and abdomen somewhat golden-hued on the 

 sides. Abdomen rufo-fawn color, with green along the dorsum 

 toward the base, and a row of yellow dorsal dots. Anterior wings 

 with interrupted whitish bands curving from inner margin to costa, 

 and tinged with rufescent; with brown lines at base of the nervules, 

 and a greenish patch over the middle of median nervules, with a 

 pale brown apical patch above it ; marginal space rufo-brownish. 



