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Updated as per Lemaire's Hemileucinae 2002, November 18, 2005 | 

Males are diurnal.
Members of this genus are often still associated with Heliconisa and Dirphia, but Ithomisa have two instead of three-segmented labial palpi.
The forewing is more slender and squarer than in Eudyaria.
I. lepta and I. umbrata may be the same as I. catherina.
P indicates an image is available. The first country listed is the specimen type locality.
 P catherina  (Schaus, 1896) 
Brazil, 
? Paraguay
f.  impuncta, Draudt, 1930, Brazil, is same as catherina
 P kinkelini  Oberthur, 1881 
Argentina, 
Brazil
 N lepta  (Druce, 1890) 
Paraguay
 P umbrata  Oiticica, 1958 
Brazil
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