LEPIDOPTERA HETEROCERA. 607 



North America. 



A. Alae anticae nigrae aut fuscae. 



A. Ala? anticae maculatae, non vittatae. 



a. Alae anticae fuscae. 



a. Abdomen supra nigrum, apice rufum. Americana, Harris. 



b. Abdomen supra fuscum,apice fulvum. Parthenos, Harris. 



b. Ala? anticae nigrae. 



a. Ala? anticae maculis paucis. - - Placentia, Abbot. 



b. Alae anticae maculis plurimis. - virginalis, Boisd. 



B. Alae anticae vittatae. 



a. Femora antica nigra, flavo notata. 



a. Alae antica? quinque vittatae. - - Virgo, Linn. 



b. Alae anticae trivittatae. 



i. Alae anticae venis apicalibus pallidis. Virguncula, Kirby. 

 ii. Alae anticae venis apicalibus obscuris. 



* Alae anticae vitta iurcata, - 5. Nais, Drury. 



** Alae anticae vitta furcata nulla. 6. Phyllira, Drury. 



b. Femora antica rufa. - Dione, Fabr. 



C. Alae anticae unimaculatae et uni vittatae. hyperborea, Curt. 



B. Alae anticae fulvae aut flavae, nigro maculatae. 



A. Alae posticae roseae. - Isabella, Abbot. 



B. Alae pusticae subcinereae. - gelida, Mosch. 



The European Arctia may be divided into four principal 

 groups, which are represented by A. Caja, A. Hebe, A. maculosa and 

 A. Casta. The North American species form three groups ; the first 

 with A. Americana belongs to the group of A. Caja ; the second 

 seems to be almost peculiar to North America, and comprises A. 

 Virgo, A. Dione, A. Nais and A. Phillira ; the third is also pecu- 

 liar to that region, and contains A. Placentia. 



21. Arctia Americana. 



Alee anticce fusca, maculis rivulisque albidis ; postica fulvo-flavce, 

 maculis unica media reniformi, tribusque posticis rotundis 

 nigris ; abdomen fu hum, dorso nigro quadrimaculato . 



Arctia Americana, Harris, Report on Insects injurious to Vegetation, 

 246 ; Agassiz, on Lake Superior, 391, pi. 7, f. 5. 



Trenton Falls. Lake Superior. 



Var.P Reddish brown. Vertex and fore part of the thorax 



bright red. Proboscis, palpi and antennae black. Thorax with a 



pale yellow band in front, and along part of each side. Abdomen 



reddish ; disk above, except towards the tip, black. Fore wings with 



PART III. 3 H 



