Vicinity of Mazon Creek, Illinois. 



375 



The very characteristic situation of these larval wings in the 

 stone is due to their primitive position on the sides of the thorax 

 and their being strongly spread outward. The base and gen- 

 eral appearance is not that of wings which have been laid back- 

 over the abdomen. They are all nearly equal, and shape as 

 well as venation — the subcosta and radius running parallel to 

 the tip, the characteristic anal vein, etc. — points to a member 

 of the Megasecoptera. 



I believe this discovery will confirm my opinion that the 

 Megasecoptera have been heterometabolous insects, for the wing 



Fig. 59. 



Fig. 59. Lameereites curvipennis (wing cases in situ). 

 Fig. 60. 



Fig. 60. Lameereites curvipennis (wing case of first pair). x 4*5. 



cases of a holometabolous form would hardly have been pre- 

 served in such a manner and position. 



This highly interesting fossil, certainly representing a new 

 species and genus, may be called in honor of my highly estim- 

 able opponent, Lameereites, new genus, curvipennis, new 

 species (see figs. 59, 60). 



Holotype in Peabody Museum, Yale University, Cat. No. 66. 



3 Family PEOCHOROPTERID^S, new family. 



The fossil inducing me to establish — though with some hesi- 

 tation — a new family, probably will prove to be an aberrant 



