594 WILLIAM T. M. FORBES 



68. THAUMATOPSIS 

 (Propexus Grote ; Crambus, in part) 



Closely related to the mutabilis group of Crambus, but with antennae of male 

 pectinate, or at least with slender laminations on the lower side twice as long 

 as the segments. Fore wing normally with a slender longitudinal white streak 

 on Cu, and sometimes on its branches toward margin, unlike all our species of 

 Crambus. R, free. 



T. repanda is reported from Saranac Inn and Newport, doubtless in error. 



Key to the species 



1. A contrasting white streak on Cu, the wing more or less darkened above it. 



2. Fore wing dark brown 5. dceckella. 



2. Fore wing clay color. 



3. A denned black streak running obliquely to apex 4. fernaldella. 



3. No such streak 1. pexella. 



1. No white. 



2. Mouse gray 2. gibsonella. 



2. Yellow '. 3. edonis. 



* Male antennce bipectinate. 



1. T. pexella Zeller. Dull clay color, shaded below and outwardly, and somewhat 

 striate with gray. A fine, somewhat sinuous white streak along lower side of cell, 

 to end, fading out at base and rarely obsolete, with a dark, sometimes partly 

 black, shade below it at base, and above at middle; an irregular series of oblique 

 shades from opposite cell to inner margin, continued by a vague shade to apex. 

 Terminal dots fine, dark. Hind wing nearly concolorous. 30 mm. 



New Jersey; Connecticut; Illinois, and west. New York: New Windsor 

 ( Morton ) . 



2. T. gibsonella Kearfott. Powdery mouse gray, strongly yellowish toward costa 

 and base, with slightly paler Cu, and with traces of the dark shading of the last 

 species. Subterminal markings obsolete, terminal dots minute or lost. Traces of 

 an oblique median shade at inner margin. Hind wing nearly concolorous, with 

 paler base. Female rather narrower-winged, with much paler and slightly yellower 

 fore wing. 26-33 mm. 



September. 

 Ontario. 



3. T. edonis Grote. Closely similar to T. gibsonella but light ochreous yellow 

 (when fresh, strongly pinkish). 35 mm. 



Nan tucket, Massachusetts; North Carolina; Kansas. 



** Male antennce unipectinate. 



4. T. fernaldella Kearfott. Similar to T. pexella. Brighter yellowish, with 

 obsolete subterminal markings; the black streak above the white line on Cu extend- 

 ing to the subterminal region and separated by a narrow longitudinal pale line 

 from a fine curved oblique streak that runs to the apex. Black streak defined 

 below, and pale edged below outwardly. 25 mm. 



A western species reported doubtfully from Anglesea, New Jersey, and from 

 Florida. 



5. T. daeckella Kearfott. Fore wing rather dark brown, hind wing blackish 

 gray; a longitudinal whitish streak on Cu, fading out near end of cell. 22 mm. 

 (Crambus haytiellus Hart, not Zincken.) 



Lucaston, New Jersey; Havana, Illinois. 



