Abstract
Euchaetesnancyaesp. n. is described from southeastern Arizona. Although superficially similar to species of Pygarctia Grote, structural and molecular variation shows it to be most closely related to Euchaeteshelena (Cassino). Adults, genitalic structure, eggs, and first instar larvae are described and illustrated. The larval host plant remains unknown. Euchaeteshelena is confirmed as occurring in Mexico.
Highlights
The genus Euchaetes Harris currently encompasses 20 species (Vincent and Laguerre 2014; Lafontaine and Schmidt 2010), most being typical of arid and semi-arid habitats of the American Southwest and Mexico
Examination of the type specimens of Euchaetes and Pygarctia described from southwestern USA and Mexico (USNM, AMNH and as illustrated in Hendrickson 2014), in addition to comparison of museum material, shows that the species described here does not have any close relatives in either genus
The lack of a prothoracic foretibial claw, and long second segment of the labial palpus places the new species in Euchaetes rather than Pygarctia
Summary
The genus Euchaetes Harris currently encompasses 20 species (Vincent and Laguerre 2014; Lafontaine and Schmidt 2010), most being typical of arid and semi-arid habitats of the American Southwest and Mexico. Two species described from Brazil are not congeneric (Watson and Goodger 1986, Hendrickson 2014). There is no modern revision of the genus, Hendrickson (2014) provides an as yet unpublished revision wherein a number of new generic combinations are proposed.
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