93] LEPIDOPTEROUS LARVAE — FRACKER 93 



h. Head compressed, retractile, one and a half times as 



long as prothorax. Diaphania 



hh. Head not compressed, not noticeably retractile, 



smaller than prothorax, Asciodes 



gg. Thoracic legs and abdominal prolegs long and slender ; 



head not compressed, not greater than prothorax in 



height. 



h. Head higher than broad; body pale. Pantographa 



hh. Head broader than high ; body marked with black 



spots. Epicorsia 



ee. Alpha located much farther cephalad than rho on eighth 



abdominal segment. Paradosis 



The following species were examined : 



Hellula undalis Loxostege sticticalis 

 Phlyctaenia extricalis L. mancalis 



P. tertialis L. maclurae 



Eustixia pupula Tholeria reversalis 



Cyhalomia helialis Hymenia perspectalis 



Pachyzancla Mpunctalis Desmia funeralis 



Pyrausta penitalis Sylepta fluctuosalis 



P. cingulata Terastia meticulosalis 



P. thestealis Evergestis dyaralis 

 Dichogama redtenhacheri E. rimosalis 



Diaphania nitidalis Asciodes gordialis 



D. quadrisiigmalis Pantographa limata 



D. sibillalis Epicorsia mellinalis 

 Paradosis flegia 



Nymphulinae. All the aquatic Pyralidoidea of America are in- 

 cluded in this subfamily. The resulting structural modifications cause 

 some difficulty in studying the chaetotaxy of the larvae. The few species 

 with tracheal gills are easily identified, for no other insects possess both 

 gills and prolegs with crochets. 



Alpha is located near rho but the relative position of the two varies 

 in different genera. Elophila and Nymphula differ from Scopariinae 

 and Crambinae in the fact that the setae beta on segment 9 are three 

 times as far apart as each is from alpha of that side, alpha being nearly 

 in a direct line between beta and rho and close to each of them. On the 

 other hand Geschna has the setae beta located near the dorsomeson as 

 usual but differs from other Pyralidoidea in the position of alpha, which 

 is directly cephalad of and close to rho. The kappa group on segment 9 

 is rather difficult to locate in this subfamily. The species examined 

 were : 



