388 LÉPIDOPTÉROLOGIE COMPARÉE 



The valves are narrower and the tip is more falcate, as in 

 zonaria, than in denhamï. The costal ridge is not so broad and 

 is less raised. 



The cornuti are shorter and less like a comb of spines. Perhaps, 

 too, their appearance is slightly more hiriaria like. 



II. Female. The ovipositor is quite as broad as that of hir- 

 iaria, although it tapers more. The sheath into which it fits 

 however, is very much narrower. Otherwise, they are very much 

 alike and both are, except for the above détails, nearly the same 

 as in zonaria. 



Habits of imago. 



The imagines, like those of denhami, émerge several weeks 

 before those of zonaria and hirtarïa but the two sexes émerge at 

 différent times, the émergence of the female anticipating that 

 of the maie by an avéra ge of four weeks. Six dates chosen at 

 random from 'my séries of maies are March Qth, Mardi 2nd, 

 March loth, March gth, February i6th and March loth. Similar 

 dates, chosen likewise in a hap-hazard manner from my females, 

 are February 2nd, February iith, February ist, February 6th, 

 February i6th and February 8th. 



Like denhami both sexes émerge late in the afternoon. The 

 maies climb up the twigs provided for them and nearly always 

 expand their wings at once, but the females rarely attempt to 

 climb having evidently, like zonaria females, lost tlîeir instinct 

 to do so, and, unless closely watched and isolated, become hopeless 

 cripples. When isolated, they rest for periods varying from a 

 quarter of an hour to four hours before elevating their wings for 

 expansion, which occurs slowly. After expand ing them however, 

 they allow them to hang over their backs a long time in order 

 to allow the superfluous liquid to evaporate off before raising 

 them to the ordinary position. On account of the abundance of 

 this liquid, thèse females are much given to saccular distension, 



