250 NOCTURNAL LEPIDOPTERA FOUND IN CANADA. 



Gen. 3. Homoptera, Boisd. 



Antennae much more than half the length of the body : crenulate, 

 ■with small bunches or whorls of hairs ranged regularly on each side 

 of the stem in the male; in the female these hairs are simple, short 

 and remote. Palpi vertical ; second joint slightly recurved ; third a 

 little shorter, linear, flattened, slightly obtuse. Proboscis moderately 

 long. Thorax robust, large, hairy, quadrate, with the tegulse long, 

 flattened, hairy, and divergent at the tips. Feet hairy in the male» 

 the intermediate thighs very thick, and densely clothed with long 

 hairs exteriorly. Abdomen stout, slightly flattened, with a large flat 

 crest at the base, and very small ones on the following segments. All 

 the wings of uniform colour, and with similar markings : the anterior 

 straight along the costa, rounded at the tips, rather oblique and 

 slightly convex on the exterior margin. 



Larva smooth, elongate, narrowed anteriorly ; head small ; a bifid 

 protuberance on the eleventh segment ; sixteen feet, of which the first 

 pair are membraneous, shorter than the rest, and unfit for progression. 

 Vupa formed within a slight cocoon among leaves ; obtuse anteriorly, 

 conical and pointed posteriorly, covered with a blueish-white, or pale 

 violet efflorescence. [Guen ) 



Most of the species of this genus are found in their perfect state 

 during the end of May and beginning of June ; some few however, do 

 not appear till August and September. They come freely to sugar at 

 night, and may be captured in the day time reposing on the under 

 side of the cross-beams of fences, and in similar sheltered positions. 

 All the species known to inhabit the extra-tropical regions of North 

 America, not including Florida, are, with one exception, found in 

 Canada, and no doubt others will be met with when the mode of cap- 

 turing by sugar is more generally adopted by Entomologists through- 

 out the country. Two of the new species have been thus discovered 

 during the early part of the present season. 



SYNOPSIS OF CANADIAN SPECIES. 



A. Size large. 



B. Wings blackish. 



C. Wings with exterior margin paler. 1. H. calycanthata, (SmiYA. 

 CC. Wings with no paler margin. 2. H. nigricans, Bethune. 

 BB. Wings more or less wood-brown colour. 



