STRUCTUEE AND LITERATUEE. 33 



of the discal cell in the males ; underneath, the 

 ed*;^es, especially outwardly, arc overlapped by the 

 tegument. The median vein is bent downwardly 

 in a curve at base to make room for the impression, 

 and thus widens the discal cell. Pteraetholix BuU 

 lula is a mixed reddish species, smaller than HcllO' 

 chilus JParadoxiis, which, in its colour and markings, 

 is much like the larger Heliothis Umbrosiis, under 

 which latter name it appears I have described 

 American specimens of the European S. Armiger. 

 In another form, Chytoriza Tecta, Grote, Can. Ent. 

 viii. p. 190, there is a small pellucid impressed spot 

 on the male primary wing. This genus, in which the 

 wdngs are a little wider, seems related to J? teraetlioliXy 

 Anomis, and Aletla, while HeUoch'ilus is allied to 

 Heliothis and Ilelicleptria. While in the other 

 genera the wings are kept stiff when at rest, in 

 the curious genus Marasmalus, with two species, 

 Ventilator and Ilistrio, found from Massachusetts 

 to Texas, the wings are rolled together so as to 

 conceal their true size. When these insects alight, 

 they seem to disappear upon folding their wings; 

 at such times they may be fancied to " have the 

 receipt of fern-seed " and to " walk invisible." 

 The genus is related to Fencillaria and Eutella. 

 Of this latter we have a beautiful and rare species 

 in the United States, H. JPulcherrima, found in New 

 York and New Jersey hitherto. 



The discal cell on both wings in the Noctuida3 is 

 open or partially closed by a thickening of the tegu- 

 ment. On the hind w^ngs vein 5 is sometimes free 

 and again connected by this cross vein with the series 



c 



