Mar. igoo.] DyAR : On LaRV.'E OF THE GeNUS ArCTIA. 35 



The last revision of the genus recognizes 23 species. We will 

 consider them under two heads, those inhabiting the Eastern States, 

 and those not found there. 



Eastern Species. 



Lining of the median vein broad. 



Veins all lined. Veins, except the median, not lined. 



1. virgo Linn. 6. 7iais Dru. 



2. virguncula KiRB. 7- phalerata H.\RR. 



3. michaho Grt. 8. vitlata Fab. i^decorata Saund.) 



4. a-ge Dru. 



5. quensclii P.\YK. 



Lining of the median vein linear or absent. 

 Veins all lined. Veins not lined. 



9. intermedia Str. 13. phyllii-a Dru. 



10. parthenica Kirb. var. fignrata Dru. 



11. antm Grt. 14. placeutia Sm. & Abb. 



12. redilinea French. 



I. Virgo as moth is a distinct and well marked species. Superfi- 

 cially, smaller specimens resemble iutcrmcdia or partJicnicc, but are 

 always distinguished by the broad lining of the median vein and the 

 two discal spots of secondaries. MicJiabo is the nearest ally, but these 

 species have a different facies and are not likely to get mixed together. 

 Virgo is abundant, particularly northward, and is a striking species, 

 readily attracting attention ; yet our knowledge of the larva is incom- 

 plete. The mature larva is black, abdominal feet and subventral 

 warts reddish ; hair bristly, black, reddish subventrally and at the an- 

 terior end ; no markings on the skin. The larvae hibernate nearly 

 full grown, apparently in the penultimate stage or in the one before 

 that, width of head 2.4 or 3 mm. I think there is only one annual 

 generation and the hibernating larvae feed up in the Spring to emerge 

 as moths in late July and early August. A number of descriptions of 

 this larva are extant, but are brief and do not cover all the stages. 

 Abbot's figure is much too pale and Stretch describes the larva as hav- 

 ing a narrow flesh-colored dorsal line. It remains to be determined 

 whether the larva ever really varies to this extent, and the full life 

 history, including all the larval stages, should be described. The char- 

 acterization that I give of the larva is taken from the specimens in the 

 National Museum (Dept. Agr. no. 2484) and from some living 

 specimens received from Mr. Doll in the late Fall of 1893. 



