398 CATALOGUE OF 



Genus 18. ISOPTERYX. 



Corpus gracile. Palpi subascendentes, compressi, squamosi, 

 non longi ; articulus 2us apice quadratus ; 3us filiformis, distinctus. 

 Palpi maxillares parvi, lineares, oblique ascendeutes, saepe indis- 

 tincti. Antennae setulis aequalihus. Abdomen alas posticas paullo 

 superans. Ala? laeves, subnitentes, concolores, lituiis non diversis ; 

 anticae angustae; posticae plus minusve sinuatae. 



Isopteryx, Guen. Delt. et Pyral. 227. 



Body slender. Palpi compressed, rounded, roughly squamous, 

 slightly ascending, not extending much beyond the bead ; second 

 joint quadrate at the tip ; third filiform, distinct. Maxillary palpi 

 small, linear, obliquely ascending, often indistinct. Antennae with 

 little bristles of equal size. Abdomen extending a little beyond the 

 hind wings. Wings smooth, slightly shining, not hyaline, alike in 

 colour, and with like markings. Fore wings narrow. Hind wings 

 with the exterior border more or less sinuated. 



North America. 



A. Alae albidae. 



A. Thorax non nigro punctatus. - - aplicalis, Guen. 



B. Thorax nigro punctatus. - - Leucothoalis, Guen. 



B. Alae ochraceo-flavae. 



A. Alae posticae annulis nullis. •• magualis, Guen. 



B. Alae posticae annulis duobus. - - - stenialis, Guen. 



C. Alae cinereo-fuscae. - - obliteralis, Guen. 



1. Isopteryx aplicalis. 



Mas. Sordide alba ; thorax guttatus ; abdomen conspersum ; alee 

 lineis nigricante-violaceis, linea marginali latiuscula* fimbria 

 basi fusca ; antica lineis exteriore et submarginali costam 

 versus approximatis, reniformi maxima quasi duplicata, costa- 

 nolata ; postica gutta discali lineam interiorem emiitente. 



Isopteryx aplicalis, Guen. Delt. et Pyral. 229, 199. 

 Georgia. 



