94 ILLINOIS BIOLOGICAL MONOGRAPHS [94 



Nymphula obscuralis, N. obliteralis, 

 Geschna (Nymphula) cannalis 

 Elophila lemnata 



Scopariinae. No American species of this subfamily have been seen. 

 Scoparia crataegella has kappa and eta of the prothorax forming a ver- 

 tical line ; kappa and eta of the abdomen forming a horizontal line ; 

 alpha of segment 9 close to and cephalodorsad of rho ; beta of segment 

 9 close to dorsomeson and located farther caudad than alpha and rho ; 

 kappa and mu absent from this segment ; crochets biordinal, not tri- 

 ordinal, in a complete circle. Otherwise similar to Crambinae. 



Family Orneodidae 



Head mainly horizontal in position, smaller than prothorax, smooth ; 

 front extending about two-thirds of the distance to the vertical triangle ; 

 adfrontals indistinct; first five ocelli arranged in an arc, with the sixth 

 behind the fifth; no secondary setae present. Body pale, bearing pri- 

 mary setae only ; shape cylindrical ; intersegmental incisions moderate. 

 Prothorax with alpha, gamma and epsilon in a transverse row, beta and 

 delta normal and rho behind and slightly below level of epsilon ; Kappa 

 group bisetose; Pi group bisetose ; mesothorax with kappa closer to eta 

 than to theta, otherwise normal. Abdomen with alpha above level of 

 beta, rho dorsad of spiracle, kappa and eta adjacent, mu present ; Pi 

 group consisting of one seta on segments 1, 7, and 8 and of three setae 

 on segments 2 to 6 inclusive ; segments 9 and 10 damaged in material 

 examined. Spiracles circular, slightly larger on prothorax than on 

 other segments, located farther dorsad on segment 8 than on segments 

 1 to 7. Prolegs short, present on segments 3, 4, 5, and 6, bearing a 

 complete circle of uniordinal crochets. 



The family contains but one species, Orneodcs hexadactyla. It will 

 be seen from the description that the structure is essentially that of a 

 pyralid, being distinguished from all other micros, except some Pter- 

 ophoridae, by the bisetose Kappa group of the prothorax. Galleria 

 is the only genus of Pyralididae which ever has uniordinal crochets and 

 in it the body is fusiform, the size large, and the Pi group on the 

 mesothorax is bisetose. 



Family Pterophoridae 



Variations in the characters of the Plume-moth larvae are so nu- 

 merous that some difficulty may be met with in placing some of the 

 species. In practice, however, one soon learns to know the long, stem- 

 like prolegs, regardless of the number of setae or crochets. (See Fig. 61.) 

 No other caterpillars possessing verrucae and secondary setae have 



