When to give up on eggcases?

[cwebster]

Purchased ooths from two sources months ago. Have had them in deli cups in the garage, checking them twice daily. Temps were 40s now 50s but so far no mantises. Were they nonviable or should i just be patient? 

 

[Vixorthegreat]

What is the species?

 

[hibiscusmile]

some take longer than others, you need to know the species to know how long they take to hatch.

 

[cwebster]

Most are tenodora sinensis. Two are carolina mantids. 

 

[cwebster]

One egg finally hatched today but most of the nymphs died.