36 STRUCTUEE AND LITERATUEE. 



and seed-pods of the same plant, resembles the flower- 

 spike in its yellowish-green colour ; it is also clothed 

 with short white hairs, making the surface pubescent 

 like the plant. Prof. Kellicott's observations on 

 this species could doubtless be repeated with many- 

 others, and are very opportune. The grey larvae of 

 Catocala and the grey front wings of the moth 

 conceal themselves readily against the trunks of the 

 trees, or the branches where they usually rest. The 

 colours of the American species of GlcBa and Scojje- 

 losoma are brighter, as compared with the European, 

 and thus follow the example set by the autumn 

 leaves in which these moths conceal themselves by 

 day. 



In May 1874 I published a List of the North- 

 American Noctuidse, classifying them as nearly as 

 I could according to Lederer's method, which I had 

 applied to many of the species in a number of sepa- 

 rate papers in various scientific journals. In 1875-76 

 I published a Check List of the species, and have 

 since then been working on a fresh Catalogue, giving 

 full references and adding what is known as to larvae, 

 food-plants, and locality. I have published lists of 

 detached genera in advance of the Catalogue, which 

 I may not be able to complete. In the pages of the 

 Bulletin of the United States Geological Survey, I 

 have catalogued the genera Hadena, Agrotis, and 

 Folia; in ' Papilio' I have catalogued ^ws^fro/ia and 

 Oncocnemis ; in the 'Canadian Entomologist' the 

 genera Mamestra^ Orthosia, and genera allied to Li- 

 tJiophane, Tarache, and several others. Mr. Henry 

 Edwards has in preparation a list of Catocalce. 



