Pyrrharctia isabella (J. E. Smith, 1797) (Lepidoptera: Arctiidae) in Louisiana

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Pyrrharctia isabella (J. E. Smith, 1797) (Lepidoptera: Arctiidae) in Louisiana
  0 8 16   n  u  m   b  e  r  o   f  a   d  u   l   t  s   Pyrrharctia isabella (J. E. Smith, 1797) (Lepidoptera: Arctiidae) in Louisiana by Vernon Antoine Brou Jr., 74320 Jack Loyd Road, Abita Springs, Louisiana 70420 USA email: Fig. 1. Pyrrharctia isabella phenotype variations : a. males, b. females. Fig. 3.  Parish records for P. isabella . The common arctiid moth described 217 years ago, Pyrrharctia isabella (J. E. Smith) (Fig 1) occurs across much, if not all of Louisiana. This species is the only member of the genus listed for North America north of Mexico by Lafontaine and Schmidt (2010). There is one additional species of the genus I am aware of, Pyrrharctia genini  Debauche which was described in 1938 from Mexico. Covell (1984) stated isabella  occurs throughout Eastern North  America, May - August, and has two annual broods. Within Louisiana, isabella  has six or more annual broods, the initial brood peaking mid March, second brood peaking at the end of May with subsequent broods peaking at approximately 32-day intervals (Fig.2). Jan Mar Feb May  Apr Jun Jul Aug Sep Oct Nov Dec **** ** Fig. 2.  Adult Pyrrharctia isabella captured in Louisiana. n = 565 a broods c d b e f g h  j  Literature Cited Covell, Jr., C.V . 1984. A field guide to the moths of eastern North America. The Peterson Field Guide Series No. 30. Houghton Mifflin Co., Boston. xv + 496pp., 64 plates. Heppner, J.B.  2003. Arthropods of Florida and neighboring land areas, vol. 17: Lepidoptera of Florida, Div. Plant Industry, Fla. Dept. Agr. & Consum. Serv., Gainesville. x + 670 pp., 55 plates. Lafontaine J.D., B.C.Schmidt 2010 Annotated check list of the Noctuoidea (Insecta, Lepidoptera) of North America north of Mexico. ZooKeys 40: 1–239. doi: 10.3897/zookeys.40.414 Heppner (2003), listed the range of isabella  to include Nova Scotia to Florida and British Columbia to California, with records in all months except November. This author also lists 30 different foodplants for isabella . The parish records in Louisiana are illustrated in Fig.3. Citation: Brou Jr., Vernon A. 2014. Pyrrharctia isabella (J. E. Smith, 1797) (Lepidoptera: Arctiidae) in Louisiana. South. Lepid. News 36: 178-179.
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