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ILLINOIS BIOLOGICAL MONOGRAPHS 



[110 



lanassa lignicolor, in all except the last stage, is very similar to 

 Schizura unicornis. The striped head, with three mesal white marks 

 in a vertical row, will distinguish it, the head of S. imicornis being 

 unicolorous red. 



Ptilodon americana is called Odontosia camelina by Packard. The 

 larva is very distinct from Odontosia elegans. 



Hyperaeschra shauld apparently be divided into two genera, for 

 the larvae of H. georgica and H. stragula are very different. 



Didugua Druce was erected for the species argentilinea Druce, 

 found in Texas. The coloration is distinctive. 



The following species of Notodontidae were examined: 

 Melalopha — all listed species 



Family Dioptidae 



Phryganidia californica, the only species of this family found in 

 North America, is described and figured by Kellogg and Jackson in 



