176 Annals Entomological Society of America [Vol. XV, 



rent at the upper end to one side of the micropyle. The 

 embryonic molt generally protrudes slightly from the lower 

 end of the rent. 



The burster is a saw-toothed carina, .118 mm. long, and 

 .029 mm. wide at the lobe. In cross section the burster is 

 V-shaped, due to the broadening at the base. There are 20 

 to 30 minute teeth along the cutting edge of the burster. The 

 lobe generally has a sharp tooth at its tip, but not always. 

 The bursters of other species of Chrysopa as far as seen are 

 practically identical with that of this species, and hatching 

 shows no essential variations. 



The writer has observed hatching a great many times in 

 each of these families, but especially among the Chrysopidae 

 and Hemerobiidae. At no time has the egg bursters been 

 observed to fail in their critical period of usefulness. Embryos 

 sometimes die before hatching, but no case has yet been seen 

 where it was thought that death had occurred because the 

 egg burster had failed to cut the chorion. They are highly 

 efficient structures. 



BIBLIOGRAPHY. 



1852. Hagen, H. A. Die Entwickelung und der innere Bau von Osmylus. Linnaea 



Entomologica, 7:368-418, 4 pi. 

 1859. Hagen, H. A. Ausschupfen von Chrvsopa larven. Stettiner Ent., Zeit. 



20:333. 

 1880. Hagen, H. A. Note on Hatching. Psyche, 8:416. 



